Reduced minimal supported IDEA version from 2018.2 to 2017.2.

Added AssertThatGuavaOptional inspection. Prepared next release.
Bumped to Kotlin 1.3.30.

README.md

@@ -32,6 +32,15 @@ Then AssertJ would tell you the contents of the collection on failure.
 
 The plugin also supports the conversion of the most common JUnit 4 assertions to AssertJ.
 
+## Usage
+
+The plugin will report inspections in your opened editor file as warnings.
+You can then quick-fix these with your quick-fix hotkey (usually Alt-Return or Opt-Return).
+
+Or, you can use the "Run Inspection by Name..." action to run one inspection on a bigger scope (e.g. the whole project).
+
+You can toggle the various inspections in the Settings/Editor/Inspections in the AssertJ group.
+
 ## Implemented inspections
 
 - AssertThatObjectIsNullOrNotNull
@@ -42,22 +51,26 @@ The plugin also supports the conversion of the most common JUnit 4 assertions to
   from: assertThat(object).isNotEqualTo(null);  
     to: assertThat(object).isNotNull();
   ```
+  
 - AssertThatBooleanIsTrueOrFalse
   ```
   from: assertThat(booleanValue).isEqualTo(true/false/Boolean.TRUE/Boolean.FALSE);  
     to: assertThat(booleanValue).isTrue()/isFalse();
   ```
+  
 - AssertThatStringIsEmpty
   ```
   from: assertThat(charSequence/string).isEqualTo("");
   from: assertThat(charSequence/string).hasSize(0);
     to: assertThat(charSequence/string).isEmpty();
   ```
+  
 - AssertThatEnumerableIsEmpty
   ```
   from: assertThat(enumerable).hasSize(0);
     to: assertThat(enumerable).isEmpty();
   ```
+  
 - AssertThatSize
   ```
   from: assertThat(array.length).isEqualTo(0);
@@ -108,7 +121,36 @@ The plugin also supports the conversion of the most common JUnit 4 assertions to
     to: assertThat(objActual).isNotNull();
   ```
   and many, many more combinations (more than 150).
-  
+
+- AssertThatJava8Optional
+  ```
+  from: assertThat(opt.isPresent()).isEqualTo(true);
+  from: assertThat(opt.isPresent()).isNotEqualTo(false);
+  from: assertThat(opt.isPresent()).isTrue();
+    to: assertThat(opt).isPresent();
+
+  from: assertThat(opt.isPresent()).isEqualTo(false);
+  from: assertThat(opt.isPresent()).isNotEqualTo(true);
+  from: assertThat(opt.isPresent()).isFalse();
+    to: assertThat(opt).isNotPresent();
+    
+  from: assertThat(opt.get()).isEqualTo("foo");
+    to: assertThat(opt).contains("foo");
+     
+  from: assertThat(opt.get()).isSameAs("foo");
+    to: assertThat(opt).containsSame("foo"); 
+
+  from: assertThat(opt).isEqualTo(Optional.of("foo"));
+  from: assertThat(opt).isEqualTo(Optional.ofNullable("foo"));
+    to: assertThat(opt).contains("foo"); 
+
+  from: assertThat(opt).isEqualTo(Optional.empty());
+    to: assertThat(opt).isNotPresent();
+
+  from: assertThat(opt).isNotEqualTo(Optional.empty());
+    to: assertThat(opt).isPresent();
+  ```
+
 - JUnitAssertToAssertJ
   ```
   assertTrue(condition);
@@ -136,52 +178,46 @@ The plugin also supports the conversion of the most common JUnit 4 assertions to
   assertArrayEquals(expectedDoubleOrFloatArray, actualDoubleOrFloatArray, delta);
   assertArrayEquals(message, expectedDoubleOrFloatArray, actualDoubleOrFloatArray, delta);
   ```
+  
+- AssertThatGuavaOptional
+  ```
+  from: assertThat(opt.isPresent()).isEqualTo(true);
+  from: assertThat(opt.isPresent()).isNotEqualTo(false);
+  from: assertThat(opt.isPresent()).isTrue();
+    to: assertThat(opt).isPresent();
+
+  from: assertThat(opt.isPresent()).isEqualTo(false);
+  from: assertThat(opt.isPresent()).isNotEqualTo(true);
+  from: assertThat(opt.isPresent()).isFalse();
+    to: assertThat(opt).isAbsent();
+    
+  from: assertThat(opt.get()).isEqualTo("foo");
+    to: assertThat(opt).contains("foo");
+     
+  from: assertThat(opt).isEqualTo(Optional.of("foo"));
+  from: assertThat(opt).isEqualTo(Optional.fromNullable("foo"));
+    to: assertThat(opt).contains("foo"); 
+
+  from: assertThat(opt).isEqualTo(Optional.absent());
+    to: assertThat(opt).isAbsent();
+
+  from: assertThat(opt).isNotEqualTo(Optional.absent());
+    to: assertThat(opt).isPresent();
+  ```
+
+  AssertJ for Guava needs to be available in the classpath.
 
 ## Development notice
 
+Cajon is written in Kotlin 1.3.
+
 Cajon is probably the only plugin that uses JUnit 5 Jupiter for unit testing so far (or at least the only one that I'm aware of ;) ).
 The IntelliJ framework actually uses the JUnit 3 TestCase for plugin testing and I took me quite a while to make it work with JUnit 5.
 Feel free to use the code (in package de.platon42.intellij.jupiter) for your projects (with attribution).
 
 ## TODO
-- AssertThatJava8OptionalContains
-  ```
-  from: assertThat(Optional.of("foo").get()).isEqualTo("foo");
-    to: assertThat(Optional.of("foo")).contains("foo");
-  ```
-- AssertThatJava8OptionalIsPresentOrAbsent
-  ```
-  from: assertThat(Optional.of("foo").isPresent()).isEqualTo(true);
-  from: assertThat(!Optional.of("foo").isPresent()).isEqualTo(false);
-  from: assertThat(Optional.of("foo").isPresent()).isTrue();
-  from: assertThat(!Optional.of("foo").isPresent()).isFalse();
-    to: assertThat(Optional.of("foo")).isPresent();
-
-  from: assertThat(Optional.of("foo").isPresent()).isEqualTo(false);
-  from: assertThat(!Optional.of("foo").isPresent()).isEqualTo(true);
-  from: assertThat(Optional.of("foo").isPresent()).isFalse();
-  from: assertThat(!Optional.of("foo").isPresent()).isTrue();
-    to: assertThat(Optional.of("foo")).isNotPresent();
-  ```
-- AssertThatGuavaOptionalContains
-  ```
-  from: assertThat(Optional.of("foo").get()).isEqualTo("foo");
-    to: assertThat(Optional.of("foo")).contains("foo");
-  ```
-- AssertThatGuavaOptionalIsPresentOrAbsent
-  ```
-  from: assertThat(Optional.of("foo").isPresent()).isEqualTo(true);
-  from: assertThat(!Optional.of("foo").isPresent()).isEqualTo(false);
-  from: assertThat(Optional.of("foo").isPresent()).isTrue();
-  from: assertThat(!Optional.of("foo").isPresent()).isFalse();
-    to: assertThat(Optional.of("foo")).isPresent();
-
-  from: assertThat(Optional.of("foo").isPresent()).isEqualTo(false);
-  from: assertThat(!Optional.of("foo").isPresent()).isEqualTo(true);
-  from: assertThat(Optional.of("foo").isPresent()).isFalse();
-  from: assertThat(!Optional.of("foo").isPresent()).isTrue();
-    to: assertThat(Optional.of("foo")).isAbsent();
-  ```
+- AssertThatNegatedBooleanExpression
+- AssertThatInstanceOf
 - Referencing string properties inside extracting()
 - Extraction with property names to lambda with Java 8
   ```
@@ -189,3 +225,24 @@ Feel free to use the code (in package de.platon42.intellij.jupiter) for your pro
     to: assertThat(object).extracting(type::getPropOne, it -> it.propNoGetter, it -> it.getPropTwo().getInnerProp())...
   ```
 - Kotlin support
+
+## Changelog
+
+#### V0.4 (11-Apr-19)
+- Reduced minimal supported IDEA version from 2018.2 to 2017.2.
+- New inspection AssertThatJava8Optional that operates on Java 8 Optional objects and tries to use contains(), containsSame(), isPresent(), and isNotPresent() instead.
+- New inspection AssertThatGuavaOptional that operates on Guava Optional objects and tries to use contains(), isPresent(), and isAbsent() instead.
+- Added support in AssertThatBinaryExpressionIsTrueOrFalse for is(Not)EqualTo(Boolean.TRUE/FALSE).
+
+#### V0.3 (07-Apr-19)
+- New inspection AssertThatBinaryExpressionIsTrueOrFalse that will find and fix common binary expressions and equals() statements (more than 150 combinations) inside assertThat().
+- Merged AssertThatObjectIsNull and AssertThatObjectIsNotNull to AssertThatObjectIsNullOrNotNull.
+- Support for hasSizeLessThan(), hasSizeLessThanOrEqualTo(), hasSizeGreaterThanOrEqualTo(), and hasSizeGreaterThan() for AssertThatSizeInspection (with AssertJ >=13.2.0).
+- Really fixed highlighting for JUnit conversion. Sorry.
+
+#### V0.2 (01-Apr-19)
+- Fixed descriptions and quick fix texts.
+- Fixed highlighting of found problems and also 'Run inspection by Name' returning nothing.
+
+#### V0.1 (31-Mar-19)
+- Initial release.

build.gradle

@@ -1,11 +1,11 @@
 plugins {
     id 'java'
     id 'org.jetbrains.intellij' version '0.4.3'
-    id 'org.jetbrains.kotlin.jvm' version '1.3.21'
+    id 'org.jetbrains.kotlin.jvm' version '1.3.30'
 }
 
 group 'de.platon42'
-version '0.3'
+version '0.4'
 
 repositories {
     mavenCentral()
@@ -41,23 +41,21 @@ intellij {
 
 patchPluginXml {
     changeNotes """
-      <h4>V0.3 (07-Apr-19)</h4>
-      <ul>
+  <h4>V0.4 (11-Apr-19)</h4>
+    <ul>
+      <li>Reduced minimal supported IDEA version from 2018.2 to 2017.2.
+      <li>New inspection AssertThatJava8Optional that operates on Java 8 Optional objects and tries to use contains(), containsSame(), isPresent(), and isNotPresent() instead.
+      <li>New inspection AssertThatGuavaOptional that operates on Guava Optional objects and tries to use contains(), isPresent(), and isAbsent() instead.
+      <li>Added support in AssertThatBinaryExpressionIsTrueOrFalse for is(Not)EqualTo(Boolean.TRUE/FALSE).
+    </ul>
+  <h4>V0.3 (07-Apr-19)</h4>
+    <ul>
       <li>New inspection AssertThatBinaryExpressionIsTrueOrFalse that will find and fix common binary expressions and equals() statements (more than 150 combinations) inside assertThat().
       <li>Merged AssertThatObjectIsNull and AssertThatObjectIsNotNull to AssertThatObjectIsNullOrNotNull.
       <li>Support for hasSizeLessThan(), hasSizeLessThanOrEqualTo(), hasSizeGreaterThanOrEqualTo(), and hasSizeGreaterThan() for AssertThatSizeInspection (with AssertJ >=13.2.0).
       <li>Really fixed highlighting for JUnit conversion. Sorry.
-      </ul>
-      <h4>V0.2 (01-Apr-19)</h4>
-      <ul>
-      <li>Fixed descriptions and quick fix texts.
-      <li>Fixed highlighting of found problems and also 'Run inspection by Name' returning nothing.
-      </ul>
-      <h4>V0.1 (31-Mar-19)</h4>
-      <ul>
-      <li>Initial release.
-      </ul>
-      """
+    </ul>
+"""
 }
 
 test {

src/main/java/de/platon42/intellij/plugins/cajon/AssertJClassNames.kt

@@ -0,0 +1,34 @@
+package de.platon42.intellij.plugins.cajon
+
+import org.jetbrains.annotations.NonNls
+
+class AssertJClassNames {
+    companion object {
+        @NonNls
+        const val ASSERTIONS_CLASSNAME = "org.assertj.core.api.Assertions"
+
+        @NonNls
+        const val ABSTRACT_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractAssert"
+        @NonNls
+        const val ABSTRACT_BOOLEAN_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractBooleanAssert"
+        @NonNls
+        const val ABSTRACT_INTEGER_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractIntegerAssert"
+        @NonNls
+        const val ABSTRACT_COMPARABLE_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractComparableAssert"
+        @NonNls
+        const val ABSTRACT_STRING_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractStringAssert"
+        @NonNls
+        const val ABSTRACT_CHAR_SEQUENCE_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractCharSequenceAssert"
+        @NonNls
+        const val ABSTRACT_ITERABLE_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractIterableAssert"
+        @NonNls
+        const val ABSTRACT_ENUMERABLE_ASSERT_CLASSNAME = "org.assertj.core.api.EnumerableAssert"
+
+        @NonNls
+        const val GUAVA_OPTIONAL_CLASSNAME = "com.google.common.base.Optional"
+        @NonNls
+        const val GUAVA_ASSERTIONS_CLASSNAME = "org.assertj.guava.api.Assertions"
+        @NonNls
+        const val GUAVA_OPTIONAL_ASSERT_CLASSNAME = "org.assertj.guava.api.OptionalAssert"
+    }
+}

src/main/java/de/platon42/intellij/plugins/cajon/Extensions.kt

@@ -0,0 +1,19 @@
+package de.platon42.intellij.plugins.cajon
+
+import com.intellij.psi.PsiExpression
+import com.intellij.psi.PsiMethodCallExpression
+
+val PsiMethodCallExpression.qualifierExpression: PsiExpression get() = this.methodExpression.qualifierExpression!!
+val PsiMethodCallExpression.firstArg: PsiExpression get() = this.argumentList.expressions[0]!!
+
+fun PsiMethodCallExpression.replaceQualifier(qualifier: PsiExpression) {
+    this.qualifierExpression.replace(qualifier)
+}
+
+fun PsiMethodCallExpression.replaceQualifierFromMethodCall(oldMethodCall: PsiMethodCallExpression) {
+    this.qualifierExpression.replace(oldMethodCall.qualifierExpression)
+}
+
+fun PsiMethodCallExpression.getArg(n: Int): PsiExpression = this.argumentList.expressions[n]
+
+fun <T> Boolean.map(forTrue: T, forFalse: T) = if (this) forTrue else forFalse

src/main/java/de/platon42/intellij/plugins/cajon/MethodNames.kt

@@ -0,0 +1,79 @@
+package de.platon42.intellij.plugins.cajon
+
+import org.jetbrains.annotations.NonNls
+
+class MethodNames {
+
+    companion object {
+
+        @NonNls
+        const val EQUALS = "equals"
+
+        @NonNls
+        const val ASSERT_THAT = "assertThat"
+        @NonNls
+        const val AS = "as"
+        @NonNls
+        const val IS_EQUAL_TO = "isEqualTo"
+        @NonNls
+        const val IS_NOT_EQUAL_TO = "isNotEqualTo"
+        @NonNls
+        const val IS_SAME_AS = "isSameAs"
+        @NonNls
+        const val IS_NOT_SAME_AS = "isNotSameAs"
+        @NonNls
+        const val IS_GREATER_THAN = "isGreaterThan"
+        @NonNls
+        const val IS_GREATER_THAN_OR_EQUAL_TO = "isGreaterThanOrEqualTo"
+        @NonNls
+        const val IS_LESS_THAN = "isLessThan"
+        @NonNls
+        const val IS_LESS_THAN_OR_EQUAL_TO = "isLessThanOrEqualTo"
+        @NonNls
+        const val IS_ZERO = "isZero"
+        @NonNls
+        const val IS_NOT_ZERO = "isNotZero"
+        @NonNls
+        const val IS_TRUE = "isTrue"
+        @NonNls
+        const val IS_FALSE = "isFalse"
+        @NonNls
+        const val IS_NULL = "isNull"
+        @NonNls
+        const val IS_NOT_NULL = "isNotNull"
+        @NonNls
+        const val IS_CLOSE_TO = "isCloseTo"
+        @NonNls
+        const val IS_NOT_CLOSE_TO = "isNotCloseTo"
+
+        @NonNls
+        const val IS_EMPTY = "isEmpty"
+        @NonNls
+        const val IS_NOT_EMPTY = "isNotEmpty"
+        @NonNls
+        const val HAS_SIZE = "hasSize"
+        @NonNls
+        const val HAS_SIZE_LESS_THAN = "hasSizeLessThan"
+        @NonNls
+        const val HAS_SIZE_LESS_THAN_OR_EQUAL_TO = "hasSizeLessThanOrEqualTo"
+        @NonNls
+        const val HAS_SIZE_GREATER_THAN = "hasSizeGreaterThan"
+        @NonNls
+        const val HAS_SIZE_GREATER_THAN_OR_EQUAL_TO = "hasSizeGreaterThanOrEqualTo"
+        @NonNls
+        const val HAS_SAME_SIZE_AS = "hasSameSizeAs"
+        @NonNls
+        const val CONTAINS = "contains"
+        @NonNls
+        const val CONTAINS_EXACTLY = "containsExactly"
+        @NonNls
+        const val CONTAINS_SAME = "containsSame"
+        @NonNls
+        const val IS_PRESENT = "isPresent"
+        @NonNls
+        const val IS_NOT_PRESENT = "isNotPresent"
+
+        @NonNls
+        const val IS_ABSENT = "isAbsent"
+    }
+}

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AbstractAssertJInspection.kt

@@ -4,105 +4,145 @@ import com.intellij.codeInspection.AbstractBaseJavaLocalInspectionTool
 import com.intellij.codeInspection.ProblemsHolder
 import com.intellij.psi.*
 import com.intellij.psi.search.GlobalSearchScope
+import com.intellij.psi.tree.IElementType
 import com.intellij.psi.util.PsiTypesUtil
 import com.siyeh.ig.callMatcher.CallMatcher
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ABSTRACT_ASSERT_CLASSNAME
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ABSTRACT_BOOLEAN_ASSERT_CLASSNAME
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ABSTRACT_COMPARABLE_ASSERT_CLASSNAME
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ABSTRACT_ENUMERABLE_ASSERT_CLASSNAME
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ABSTRACT_INTEGER_ASSERT_CLASSNAME
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ASSERTIONS_CLASSNAME
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.GUAVA_ASSERTIONS_CLASSNAME
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.GUAVA_OPTIONAL_CLASSNAME
+import de.platon42.intellij.plugins.cajon.MethodNames
+import de.platon42.intellij.plugins.cajon.getArg
+import de.platon42.intellij.plugins.cajon.qualifierExpression
+import de.platon42.intellij.plugins.cajon.quickfixes.RemoveActualOutmostMethodCallQuickFix
+import de.platon42.intellij.plugins.cajon.quickfixes.RemoveExpectedOutmostMethodCallQuickFix
 import de.platon42.intellij.plugins.cajon.quickfixes.ReplaceSimpleMethodCallQuickFix
-import org.jetbrains.annotations.NonNls
 
 open class AbstractAssertJInspection : AbstractBaseJavaLocalInspectionTool() {
 
     companion object {
-        const val SIMPLIFY_MESSAGE_TEMPLATE = "%s can be simplified to %s"
+        const val SIMPLIFY_MESSAGE_TEMPLATE = "%s() can be simplified to %s()"
+        const val MORE_CONCISE_MESSAGE_TEMPLATE = "%s() would be more concise than %s()"
 
-        const val REPLACE_DESCRIPTION_TEMPLATE = "Replace %s with %s"
+        const val REPLACE_DESCRIPTION_TEMPLATE = "Replace %s() with %s()"
 
-        @NonNls
-        const val ASSERTIONS_CLASSNAME = "org.assertj.core.api.Assertions"
+        val TOKEN_TO_ASSERTJ_FOR_PRIMITIVE_MAP = mapOf<IElementType, String>(
+            JavaTokenType.EQEQ to MethodNames.IS_EQUAL_TO,
+            JavaTokenType.NE to MethodNames.IS_NOT_EQUAL_TO,
+            JavaTokenType.GT to MethodNames.IS_GREATER_THAN,
+            JavaTokenType.GE to MethodNames.IS_GREATER_THAN_OR_EQUAL_TO,
+            JavaTokenType.LT to MethodNames.IS_LESS_THAN,
+            JavaTokenType.LE to MethodNames.IS_LESS_THAN_OR_EQUAL_TO
+        )
 
-        @NonNls
-        const val ABSTRACT_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractAssert"
-        @NonNls
-        const val ABSTRACT_BOOLEAN_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractBooleanAssert"
-        @NonNls
-        const val ABSTRACT_INTEGER_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractIntegerAssert"
-        @NonNls
-        const val ABSTRACT_COMPARABLE_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractComparableAssert"
-        @NonNls
-        const val ABSTRACT_STRING_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractStringAssert"
-        @NonNls
-        const val ABSTRACT_CHAR_SEQUENCE_ASSERT_CLASSNAME = "org.assertj.core.api.AbstractCharSequenceAssert"
-        @NonNls
-        const val ABSTRACT_ENUMERABLE_ASSERT_CLASSNAME = "org.assertj.core.api.EnumerableAssert"
+        val TOKEN_TO_ASSERTJ_FOR_OBJECT_MAPPINGS = mapOf<IElementType, String>(
+            JavaTokenType.EQEQ to MethodNames.IS_SAME_AS,
+            JavaTokenType.NE to MethodNames.IS_NOT_SAME_AS
+        )
 
-        @NonNls
-        const val ASSERT_THAT_METHOD = "assertThat"
-        @NonNls
-        const val IS_EQUAL_TO_METHOD = "isEqualTo"
-        @NonNls
-        const val IS_NOT_EQUAL_TO_METHOD = "isNotEqualTo"
-        @NonNls
-        const val IS_GREATER_THAN_METHOD = "isGreaterThan"
-        @NonNls
-        const val IS_GREATER_THAN_OR_EQUAL_TO_METHOD = "isGreaterThanOrEqualTo"
-        @NonNls
-        const val IS_LESS_THAN_METHOD = "isLessThan"
-        @NonNls
-        const val IS_LESS_THAN_OR_EQUAL_TO_METHOD = "isLessThanOrEqualTo"
-        @NonNls
-        const val IS_ZERO_METHOD = "isZero"
-        @NonNls
-        const val IS_NOT_ZERO_METHOD = "isNotZero"
-        @NonNls
-        const val IS_TRUE_METHOD = "isTrue"
-        @NonNls
-        const val IS_FALSE_METHOD = "isFalse"
-        @NonNls
-        const val HAS_SIZE_METHOD = "hasSize"
+        val SWAP_SIDE_OF_BINARY_OPERATOR = mapOf<IElementType, IElementType>(
+            JavaTokenType.GT to JavaTokenType.LT,
+            JavaTokenType.GE to JavaTokenType.LE,
+            JavaTokenType.LT to JavaTokenType.GT,
+            JavaTokenType.LE to JavaTokenType.GE
+        )
 
-        val ASSERT_THAT_INT = CallMatcher.staticCall(ASSERTIONS_CLASSNAME, ASSERT_THAT_METHOD)
+        val INVERT_BINARY_OPERATOR = mapOf<IElementType, IElementType>(
+            JavaTokenType.EQEQ to JavaTokenType.NE,
+            JavaTokenType.NE to JavaTokenType.EQEQ,
+            JavaTokenType.GT to JavaTokenType.LE,
+            JavaTokenType.GE to JavaTokenType.LT,
+            JavaTokenType.LT to JavaTokenType.GE,
+            JavaTokenType.LE to JavaTokenType.GT
+        )
+
+
+        val ASSERT_THAT_INT = CallMatcher.staticCall(ASSERTIONS_CLASSNAME, MethodNames.ASSERT_THAT)
             .parameterTypes("int")!!
 
-        val ASSERT_THAT_BOOLEAN = CallMatcher.staticCall(ASSERTIONS_CLASSNAME, ASSERT_THAT_METHOD)
+        val ASSERT_THAT_BOOLEAN = CallMatcher.staticCall(ASSERTIONS_CLASSNAME, MethodNames.ASSERT_THAT)
             .parameterTypes("boolean")!!
 
-        val IS_EQUAL_TO_OBJECT = CallMatcher.instanceCall(ABSTRACT_ASSERT_CLASSNAME, IS_EQUAL_TO_METHOD)
+        val ASSERT_THAT_ANY = CallMatcher.staticCall(ASSERTIONS_CLASSNAME, MethodNames.ASSERT_THAT)
+            .parameterCount(1)!!
+
+        val ASSERT_THAT_JAVA8_OPTIONAL = CallMatcher.staticCall(ASSERTIONS_CLASSNAME, MethodNames.ASSERT_THAT)
+            .parameterTypes(CommonClassNames.JAVA_UTIL_OPTIONAL)!!
+
+        val ASSERT_THAT_GUAVA_OPTIONAL = CallMatcher.staticCall(GUAVA_ASSERTIONS_CLASSNAME, MethodNames.ASSERT_THAT)
+            .parameterTypes(GUAVA_OPTIONAL_CLASSNAME)!!
+
+        val IS_EQUAL_TO_OBJECT = CallMatcher.instanceCall(ABSTRACT_ASSERT_CLASSNAME, MethodNames.IS_EQUAL_TO)
             .parameterTypes(CommonClassNames.JAVA_LANG_OBJECT)!!
-        val IS_NOT_EQUAL_TO_OBJECT = CallMatcher.instanceCall(ABSTRACT_ASSERT_CLASSNAME, IS_NOT_EQUAL_TO_METHOD)
+        val IS_NOT_EQUAL_TO_OBJECT = CallMatcher.instanceCall(ABSTRACT_ASSERT_CLASSNAME, MethodNames.IS_NOT_EQUAL_TO)
             .parameterTypes(CommonClassNames.JAVA_LANG_OBJECT)!!
-        val IS_EQUAL_TO_BOOLEAN = CallMatcher.instanceCall(ABSTRACT_BOOLEAN_ASSERT_CLASSNAME, IS_EQUAL_TO_METHOD)
+        val IS_EQUAL_TO_BOOLEAN = CallMatcher.instanceCall(ABSTRACT_BOOLEAN_ASSERT_CLASSNAME, MethodNames.IS_EQUAL_TO)
             .parameterTypes("boolean")!!
         val IS_NOT_EQUAL_TO_BOOLEAN =
-            CallMatcher.instanceCall(ABSTRACT_BOOLEAN_ASSERT_CLASSNAME, IS_NOT_EQUAL_TO_METHOD)
+            CallMatcher.instanceCall(ABSTRACT_BOOLEAN_ASSERT_CLASSNAME, MethodNames.IS_NOT_EQUAL_TO)
                 .parameterTypes("boolean")!!
-        val HAS_SIZE = CallMatcher.instanceCall(ABSTRACT_ENUMERABLE_ASSERT_CLASSNAME, HAS_SIZE_METHOD)
+        val IS_SAME_AS_OBJECT = CallMatcher.instanceCall(ABSTRACT_ASSERT_CLASSNAME, MethodNames.IS_SAME_AS)
+            .parameterTypes(CommonClassNames.JAVA_LANG_OBJECT)!!
+        val IS_NOT_SAME_AS_OBJECT = CallMatcher.instanceCall(ABSTRACT_ASSERT_CLASSNAME, MethodNames.IS_NOT_SAME_AS)
+            .parameterTypes(CommonClassNames.JAVA_LANG_OBJECT)!!
+
+        val HAS_SIZE = CallMatcher.instanceCall(ABSTRACT_ENUMERABLE_ASSERT_CLASSNAME, MethodNames.HAS_SIZE)
             .parameterTypes("int")!!
 
-        val IS_EQUAL_TO_INT = CallMatcher.instanceCall(ABSTRACT_ASSERT_CLASSNAME, IS_EQUAL_TO_METHOD)
+        val IS_EQUAL_TO_INT = CallMatcher.instanceCall(ABSTRACT_ASSERT_CLASSNAME, MethodNames.IS_EQUAL_TO)
             .parameterTypes("int")!!
-        val IS_GREATER_THAN_INT = CallMatcher.instanceCall(ABSTRACT_COMPARABLE_ASSERT_CLASSNAME, IS_GREATER_THAN_METHOD)
+        val IS_GREATER_THAN_INT = CallMatcher.instanceCall(ABSTRACT_COMPARABLE_ASSERT_CLASSNAME, MethodNames.IS_GREATER_THAN)
             .parameterTypes("int")!!
-        val IS_GREATER_THAN_OR_EQUAL_TO_INT = CallMatcher.instanceCall(ABSTRACT_COMPARABLE_ASSERT_CLASSNAME, IS_GREATER_THAN_OR_EQUAL_TO_METHOD)
+        val IS_GREATER_THAN_OR_EQUAL_TO_INT = CallMatcher.instanceCall(ABSTRACT_COMPARABLE_ASSERT_CLASSNAME, MethodNames.IS_GREATER_THAN_OR_EQUAL_TO)
             .parameterTypes("int")!!
 
-        val IS_LESS_THAN_INT = CallMatcher.instanceCall(ABSTRACT_COMPARABLE_ASSERT_CLASSNAME, IS_LESS_THAN_METHOD)
+        val IS_LESS_THAN_INT = CallMatcher.instanceCall(ABSTRACT_COMPARABLE_ASSERT_CLASSNAME, MethodNames.IS_LESS_THAN)
             .parameterTypes("int")!!
-        val IS_LESS_THAN_OR_EQUAL_TO_INT = CallMatcher.instanceCall(ABSTRACT_COMPARABLE_ASSERT_CLASSNAME, IS_LESS_THAN_OR_EQUAL_TO_METHOD)
+        val IS_LESS_THAN_OR_EQUAL_TO_INT = CallMatcher.instanceCall(ABSTRACT_COMPARABLE_ASSERT_CLASSNAME, MethodNames.IS_LESS_THAN_OR_EQUAL_TO)
             .parameterTypes("int")!!
 
-        val IS_ZERO = CallMatcher.instanceCall(ABSTRACT_INTEGER_ASSERT_CLASSNAME, IS_ZERO_METHOD)
+        val IS_ZERO = CallMatcher.instanceCall(ABSTRACT_INTEGER_ASSERT_CLASSNAME, MethodNames.IS_ZERO)
             .parameterCount(0)!!
-        val IS_NOT_ZERO = CallMatcher.instanceCall(ABSTRACT_INTEGER_ASSERT_CLASSNAME, IS_NOT_ZERO_METHOD)
+        val IS_NOT_ZERO = CallMatcher.instanceCall(ABSTRACT_INTEGER_ASSERT_CLASSNAME, MethodNames.IS_NOT_ZERO)
             .parameterCount(0)!!
 
-        val IS_TRUE = CallMatcher.instanceCall(ABSTRACT_BOOLEAN_ASSERT_CLASSNAME, IS_TRUE_METHOD)
+        val IS_TRUE = CallMatcher.instanceCall(ABSTRACT_BOOLEAN_ASSERT_CLASSNAME, MethodNames.IS_TRUE)
             .parameterCount(0)!!
-        val IS_FALSE = CallMatcher.instanceCall(ABSTRACT_BOOLEAN_ASSERT_CLASSNAME, IS_FALSE_METHOD)
+        val IS_FALSE = CallMatcher.instanceCall(ABSTRACT_BOOLEAN_ASSERT_CLASSNAME, MethodNames.IS_FALSE)
             .parameterCount(0)!!
 
         val COLLECTION_SIZE = CallMatcher.instanceCall(CommonClassNames.JAVA_UTIL_COLLECTION, "size")
             .parameterCount(0)!!
         val OBJECT_EQUALS = CallMatcher.instanceCall(CommonClassNames.JAVA_LANG_OBJECT, "equals")
             .parameterTypes(CommonClassNames.JAVA_LANG_OBJECT)!!
+
+        val OPTIONAL_GET = CallMatcher.instanceCall(CommonClassNames.JAVA_UTIL_OPTIONAL, "get")
+            .parameterCount(0)!!
+        val OPTIONAL_IS_PRESENT = CallMatcher.instanceCall(CommonClassNames.JAVA_UTIL_OPTIONAL, "isPresent")
+            .parameterCount(0)!!
+
+        val OPTIONAL_OF = CallMatcher.staticCall(CommonClassNames.JAVA_UTIL_OPTIONAL, "of")
+            .parameterCount(1)!!
+        val OPTIONAL_OF_NULLABLE = CallMatcher.staticCall(CommonClassNames.JAVA_UTIL_OPTIONAL, "ofNullable")
+            .parameterCount(1)!!
+        val OPTIONAL_EMPTY = CallMatcher.staticCall(CommonClassNames.JAVA_UTIL_OPTIONAL, "empty")
+            .parameterCount(0)!!
+
+        val GUAVA_OPTIONAL_GET = CallMatcher.instanceCall(GUAVA_OPTIONAL_CLASSNAME, "get")
+            .parameterCount(0)!!
+        val GUAVA_OPTIONAL_IS_PRESENT = CallMatcher.instanceCall(GUAVA_OPTIONAL_CLASSNAME, "isPresent")
+            .parameterCount(0)!!
+
+        val GUAVA_OPTIONAL_OF = CallMatcher.staticCall(GUAVA_OPTIONAL_CLASSNAME, "of")
+            .parameterCount(1)!!
+        val GUAVA_OPTIONAL_FROM_NULLABLE = CallMatcher.staticCall(GUAVA_OPTIONAL_CLASSNAME, "fromNullable")
+            .parameterCount(1)!!
+        val GUAVA_OPTIONAL_ABSENT = CallMatcher.staticCall(GUAVA_OPTIONAL_CLASSNAME, "absent")
+            .parameterCount(0)!!
     }
 
     override fun getGroupDisplayName(): String {
@@ -110,8 +150,8 @@ open class AbstractAssertJInspection : AbstractBaseJavaLocalInspectionTool() {
     }
 
     protected fun checkAssertedType(expression: PsiMethodCallExpression, classname: String): Boolean {
-        var assertedType = expression.methodExpression.qualifierExpression?.type ?: return false
-        if (assertedType is PsiCapturedWildcardType) {
+        var assertedType = expression.qualifierExpression.type ?: return false
+        while (assertedType is PsiCapturedWildcardType) {
             assertedType = assertedType.upperBound
         }
         val assertedClass = PsiTypesUtil.getPsiClass(assertedType) ?: return false
@@ -120,8 +160,7 @@ open class AbstractAssertJInspection : AbstractBaseJavaLocalInspectionTool() {
         return assertedClass.isEquivalentTo(expectedClass) || assertedClass.isInheritor(expectedClass, true)
     }
 
-    protected fun getOriginalMethodName(expression: PsiMethodCallExpression) =
-        expression.resolveMethod()?.name?.plus("()")
+    protected fun getOriginalMethodName(expression: PsiMethodCallExpression) = expression.resolveMethod()?.name
 
     protected fun registerSimplifyMethod(
         holder: ProblemsHolder,
@@ -131,25 +170,75 @@ open class AbstractAssertJInspection : AbstractBaseJavaLocalInspectionTool() {
         val originalMethod = getOriginalMethodName(expression) ?: return
         val description = REPLACE_DESCRIPTION_TEMPLATE.format(originalMethod, replacementMethod)
         val message = SIMPLIFY_MESSAGE_TEMPLATE.format(originalMethod, replacementMethod)
-        holder.registerProblem(
-            expression,
-            message,
-            ReplaceSimpleMethodCallQuickFix(description, replacementMethod)
-        )
+        val quickFix = ReplaceSimpleMethodCallQuickFix(description, replacementMethod)
+        holder.registerProblem(expression, message, quickFix)
+    }
+
+    protected fun registerRemoveActualOutmostMethod(
+        holder: ProblemsHolder,
+        expression: PsiMethodCallExpression,
+        expectedCallExpression: PsiMethodCallExpression,
+        replacementMethod: String,
+        noExpectedExpression: Boolean = false
+    ) {
+        val originalMethod = getOriginalMethodName(expectedCallExpression) ?: return
+        val description = REPLACE_DESCRIPTION_TEMPLATE.format(originalMethod, replacementMethod)
+        val message = MORE_CONCISE_MESSAGE_TEMPLATE.format(replacementMethod, originalMethod)
+        val quickfix = RemoveActualOutmostMethodCallQuickFix(description, replacementMethod, noExpectedExpression)
+        holder.registerProblem(expression, message, quickfix)
+    }
+
+    protected fun registerRemoveExpectedOutmostMethod(
+        holder: ProblemsHolder,
+        expression: PsiMethodCallExpression,
+        expectedCallExpression: PsiMethodCallExpression,
+        replacementMethod: String
+    ) {
+        val originalMethod = getOriginalMethodName(expectedCallExpression) ?: return
+        val description = REPLACE_DESCRIPTION_TEMPLATE.format(originalMethod, replacementMethod)
+        val message = MORE_CONCISE_MESSAGE_TEMPLATE.format(replacementMethod, originalMethod)
+        val quickfix = RemoveExpectedOutmostMethodCallQuickFix(description, replacementMethod)
+        holder.registerProblem(expression, message, quickfix)
     }
 
     protected fun calculateConstantParameterValue(expression: PsiMethodCallExpression, argIndex: Int): Any? {
-        if (argIndex >= expression.argumentList.expressionCount) return null
-        val valueExpression = expression.argumentList.expressions[argIndex] ?: return null
+        if (argIndex >= expression.argumentList.expressions.size) return null
+        val valueExpression = expression.getArg(argIndex)
         val constantEvaluationHelper = JavaPsiFacade.getInstance(expression.project).constantEvaluationHelper
-        return constantEvaluationHelper.computeConstantExpression(valueExpression)
+        val value = constantEvaluationHelper.computeConstantExpression(valueExpression)
+        if (value == null) {
+            val field = (valueExpression as? PsiReferenceExpression)?.resolve() as? PsiField
+            if (field?.containingClass?.qualifiedName == CommonClassNames.JAVA_LANG_BOOLEAN) {
+                return when (field.name) {
+                    "TRUE" -> true
+                    "FALSE" -> false
+                    else -> null
+                }
+            }
+        }
+        return value
     }
 
-    protected fun hasAssertJMethod(element: PsiElement, classAndMethod: String): Boolean {
-        val classname = "org.assertj.core.api.${classAndMethod.substringBeforeLast(".")}"
+    protected fun getExpectedBooleanResult(expectedCallExpression: PsiMethodCallExpression): Boolean? {
+        val isTrue = IS_TRUE.test(expectedCallExpression)
+        val isFalse = IS_FALSE.test(expectedCallExpression)
+        if (isTrue || isFalse) {
+            return isTrue
+        } else {
+            val isEqualTo = IS_EQUAL_TO_BOOLEAN.test(expectedCallExpression) || IS_EQUAL_TO_OBJECT.test(expectedCallExpression)
+            val isNotEqualTo = IS_NOT_EQUAL_TO_BOOLEAN.test(expectedCallExpression) || IS_NOT_EQUAL_TO_OBJECT.test(expectedCallExpression)
+            if (isEqualTo || isNotEqualTo) {
+                val constValue = calculateConstantParameterValue(expectedCallExpression, 0) as? Boolean ?: return null
+                return isNotEqualTo xor constValue
+            }
+        }
+        return null
+    }
+
+    protected fun hasAssertJMethod(element: PsiElement, classname: String, methodname: String): Boolean {
         val findClass =
             JavaPsiFacade.getInstance(element.project).findClass(classname, GlobalSearchScope.allScope(element.project))
                 ?: return false
-        return findClass.findMethodsByName(classAndMethod.substringAfterLast(".")).isNotEmpty()
+        return findClass.findMethodsByName(methodname).isNotEmpty()
     }
 }

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AbstractJUnitAssertInspection.kt

@@ -9,7 +9,7 @@ open class AbstractJUnitAssertInspection : AbstractBaseJavaLocalInspectionTool()
     companion object {
         const val CONVERT_MESSAGE_TEMPLATE = "%s can be converted to AssertJ style"
 
-        const val REPLACE_DESCRIPTION_TEMPLATE = "Replace %s with assertThat().%s"
+        const val REPLACE_DESCRIPTION_TEMPLATE = "Replace %s() with assertThat().%s()"
 
         @NonNls
         const val JUNIT_ASSERT_CLASSNAME = "org.junit.Assert"
@@ -38,6 +38,5 @@ open class AbstractJUnitAssertInspection : AbstractBaseJavaLocalInspectionTool()
         return "AssertJ"
     }
 
-    protected fun getOriginalMethodName(expression: PsiMethodCallExpression) =
-        expression.resolveMethod()?.name?.plus("()")
+    protected fun getOriginalMethodName(expression: PsiMethodCallExpression) = expression.resolveMethod()?.name
 }

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatBinaryExpressionIsTrueOrFalseInspection.kt

@@ -2,9 +2,13 @@ package de.platon42.intellij.plugins.cajon.inspections
 
 import com.intellij.codeInspection.ProblemsHolder
 import com.intellij.psi.*
-import com.intellij.psi.tree.IElementType
 import com.intellij.psi.util.PsiTreeUtil
 import com.intellij.psi.util.TypeConversionUtil
+import de.platon42.intellij.plugins.cajon.MethodNames
+import de.platon42.intellij.plugins.cajon.MethodNames.Companion.IS_NOT_NULL
+import de.platon42.intellij.plugins.cajon.MethodNames.Companion.IS_NULL
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
 import de.platon42.intellij.plugins.cajon.quickfixes.SplitBinaryExpressionMethodCallQuickFix
 import de.platon42.intellij.plugins.cajon.quickfixes.SplitEqualsExpressionMethodCallQuickFix
 
@@ -12,33 +16,8 @@ class AssertThatBinaryExpressionIsTrueOrFalseInspection : AbstractAssertJInspect
 
     companion object {
         private const val DISPLAY_NAME = "Asserting a binary expression"
-        private const val SPLIT_BINARY_EXPRESSION_DESCRIPTION = "Split binary expression out of assertThat()"
-        private const val SPLIT_EQUALS_EXPRESSION_DESCRIPTION = "Split equals() expression out of assertThat()"
-        private const val BINARY_MORE_MEANINGFUL_MESSAGE = "Moving binary expression out of assertThat() would be more meaningful"
-        private const val EQUALS_MORE_MEANINGFUL_MESSAGE = "Moving equals() expression out of assertThat() would be more meaningful"
-
-        private val PRIMITIVE_MAPPINGS = listOf(
-            Mapping(JavaTokenType.EQEQ, "isEqualTo()", "isNotEqualTo()"),
-            Mapping(JavaTokenType.NE, "isNotEqualTo()", "isEqualTo()"),
-            Mapping(JavaTokenType.GT, "isGreaterThan()", "isLessThanOrEqualTo()"),
-            Mapping(JavaTokenType.GE, "isGreaterThanOrEqualTo()", "isLessThan()"),
-            Mapping(JavaTokenType.LT, "isLessThan()", "isGreaterThanOrEqualTo()"),
-            Mapping(JavaTokenType.LE, "isLessThanOrEqualTo()", "isGreaterThan()")
-        )
-
-        private val PRIMITIVE_MAPPINGS_SWAPPED = listOf(
-            Mapping(JavaTokenType.EQEQ, "isEqualTo()", "isNotEqualTo()"),
-            Mapping(JavaTokenType.NE, "isNotEqualTo()", "isEqualTo()"),
-            Mapping(JavaTokenType.GT, "isLessThan()", "isGreaterThanOrEqualTo()"),
-            Mapping(JavaTokenType.GE, "isLessThanOrEqualTo()", "isGreaterThan()"),
-            Mapping(JavaTokenType.LT, "isGreaterThan()", "isLessThanOrEqualTo()"),
-            Mapping(JavaTokenType.LE, "isGreaterThanOrEqualTo()", "isLessThan()")
-        )
-
-        private val OBJECT_MAPPINGS = listOf(
-            Mapping(JavaTokenType.EQEQ, "isSameAs()", "isNotSameAs()"),
-            Mapping(JavaTokenType.NE, "isNotSameAs()", "isSameAs()")
-        )
+        private const val SPLIT_EXPRESSION_DESCRIPTION_TEMPLATE = "Split %s expression out of assertThat()"
+        private const val MORE_MEANINGFUL_MESSAGE_TEMPLATE = "Moving %s expression out of assertThat() would be more meaningful"
     }
 
     override fun getDisplayName() = DISPLAY_NAME
@@ -53,16 +32,16 @@ class AssertThatBinaryExpressionIsTrueOrFalseInspection : AbstractAssertJInspect
 
                 val statement = PsiTreeUtil.getParentOfType(expression, PsiStatement::class.java) ?: return
                 val expectedCallExpression = PsiTreeUtil.findChildOfType(statement, PsiMethodCallExpression::class.java) ?: return
-                val isInverted = getExpectedResult(expectedCallExpression) ?: return
+                val expectedResult = getExpectedBooleanResult(expectedCallExpression) ?: return
 
-                val assertThatArgument = expression.argumentList.expressions[0] ?: return
+                val assertThatArgument = expression.firstArg
                 if (assertThatArgument is PsiMethodCallExpression && OBJECT_EQUALS.test(assertThatArgument)) {
-                    val replacementMethod = if (isInverted) "isNotEqualTo()" else "isEqualTo()"
-                    holder.registerProblem(
-                        expression,
-                        EQUALS_MORE_MEANINGFUL_MESSAGE,
-                        SplitEqualsExpressionMethodCallQuickFix(SPLIT_EQUALS_EXPRESSION_DESCRIPTION, replacementMethod)
-                    )
+                    val replacementMethod = if (expectedResult) MethodNames.IS_EQUAL_TO else MethodNames.IS_NOT_EQUAL_TO
+                    val type = "${MethodNames.EQUALS}()"
+                    val description = SPLIT_EXPRESSION_DESCRIPTION_TEMPLATE.format(type)
+                    val message = MORE_MEANINGFUL_MESSAGE_TEMPLATE.format(type)
+                    val quickFix = SplitEqualsExpressionMethodCallQuickFix(description, replacementMethod)
+                    holder.registerProblem(expression, message, quickFix)
                     return
                 }
 
@@ -71,55 +50,35 @@ class AssertThatBinaryExpressionIsTrueOrFalseInspection : AbstractAssertJInspect
                 val leftType = binaryExpression.lOperand.type ?: return
                 val rightType = binaryExpression.rOperand?.type ?: return
 
-                val isLeftNull = TypeConversionUtil.isNullType(leftType)
-                val isRightNull = TypeConversionUtil.isNullType(rightType)
+                val bothTypes = listOf(leftType, rightType)
+                val (isLeftNull, isRightNull) = bothTypes.map(TypeConversionUtil::isNullType)
                 if (isLeftNull && isRightNull) {
                     return
                 } else if (isLeftNull || isRightNull) {
-                    registerSplitBinaryExpressionMethod(
-                        holder,
-                        expression,
-                        if (isInverted) "isNotNull()" else "isNull()",
-                        pickRightOperand = isLeftNull,
-                        noExpectedExpression = true
-                    )
+                    val replacementMethod = if (expectedResult) IS_NULL else IS_NOT_NULL
+                    registerSplitBinaryExpressionMethod(holder, expression, replacementMethod, pickRightOperand = isLeftNull, noExpectedExpression = true)
                     return
                 }
 
-                val isPrimitive = TypeConversionUtil.isPrimitiveAndNotNull(leftType) && TypeConversionUtil.isPrimitiveAndNotNull(rightType)
-                val isNumericType = TypeConversionUtil.isNumericType(leftType) && TypeConversionUtil.isNumericType(rightType)
+                val isPrimitive = bothTypes.all(TypeConversionUtil::isPrimitiveAndNotNull)
+                val isNumericType = bothTypes.all(TypeConversionUtil::isNumericType)
                 val constantEvaluationHelper = JavaPsiFacade.getInstance(expression.project).constantEvaluationHelper
                 val swapExpectedAndActual = constantEvaluationHelper.computeConstantExpression(binaryExpression.lOperand) != null
 
                 val tokenType = binaryExpression.operationSign.tokenType
-                val mappingToUse =
-                    if (isPrimitive || isNumericType) {
-                        if (swapExpectedAndActual) PRIMITIVE_MAPPINGS_SWAPPED else PRIMITIVE_MAPPINGS
-                    } else {
-                        OBJECT_MAPPINGS
+                    .let {
+                        if (swapExpectedAndActual) SWAP_SIDE_OF_BINARY_OPERATOR.getOrDefault(it, it) else it
                     }
-                val mapping = mappingToUse.find { it.tokenType == tokenType } ?: return
-                val replacementMethod = if (isInverted) mapping.replacementInverted else mapping.replacement
+                    .let {
+                        if (expectedResult) it else INVERT_BINARY_OPERATOR.getOrDefault(it, it)
+                    } ?: return
+                val mappingToUse =
+                    (isPrimitive || isNumericType).map(TOKEN_TO_ASSERTJ_FOR_PRIMITIVE_MAP, TOKEN_TO_ASSERTJ_FOR_OBJECT_MAPPINGS)
+                val replacementMethod = mappingToUse[tokenType] ?: return
 
                 registerSplitBinaryExpressionMethod(holder, expression, replacementMethod, pickRightOperand = swapExpectedAndActual)
             }
 
-            private fun getExpectedResult(expectedCallExpression: PsiMethodCallExpression): Boolean? {
-                val isTrue = IS_TRUE.test(expectedCallExpression)
-                val isFalse = IS_FALSE.test(expectedCallExpression)
-                if (isTrue || isFalse) {
-                    return isFalse
-                } else {
-                    val isEqualTo = IS_EQUAL_TO_BOOLEAN.test(expectedCallExpression)
-                    val isNotEqualTo = IS_NOT_EQUAL_TO_BOOLEAN.test(expectedCallExpression)
-                    if (isEqualTo || isNotEqualTo) {
-                        val constValue = calculateConstantParameterValue(expectedCallExpression, 0) as? Boolean ?: return null
-                        return isEqualTo xor constValue
-                    }
-                }
-                return null
-            }
-
             private fun registerSplitBinaryExpressionMethod(
                 holder: ProblemsHolder,
                 expression: PsiMethodCallExpression,
@@ -127,18 +86,12 @@ class AssertThatBinaryExpressionIsTrueOrFalseInspection : AbstractAssertJInspect
                 pickRightOperand: Boolean = false,
                 noExpectedExpression: Boolean = false
             ) {
-                holder.registerProblem(
-                    expression,
-                    BINARY_MORE_MEANINGFUL_MESSAGE,
-                    SplitBinaryExpressionMethodCallQuickFix(SPLIT_BINARY_EXPRESSION_DESCRIPTION, replacementMethod, pickRightOperand, noExpectedExpression)
-                )
+                val type = "binary"
+                val description = SPLIT_EXPRESSION_DESCRIPTION_TEMPLATE.format(type)
+                val message = MORE_MEANINGFUL_MESSAGE_TEMPLATE.format(type)
+                val quickFix = SplitBinaryExpressionMethodCallQuickFix(description, replacementMethod, pickRightOperand, noExpectedExpression)
+                holder.registerProblem(expression, message, quickFix)
             }
         }
     }
-
-    private class Mapping(
-        val tokenType: IElementType,
-        val replacement: String,
-        val replacementInverted: String
-    )
 }

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatBooleanIsTrueOrFalseInspection.kt

@@ -1,8 +1,14 @@
 package de.platon42.intellij.plugins.cajon.inspections
 
 import com.intellij.codeInspection.ProblemsHolder
-import com.intellij.psi.*
+import com.intellij.psi.JavaElementVisitor
+import com.intellij.psi.PsiElementVisitor
+import com.intellij.psi.PsiMethodCallExpression
 import com.intellij.psi.util.TypeConversionUtil
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ABSTRACT_BOOLEAN_ASSERT_CLASSNAME
+import de.platon42.intellij.plugins.cajon.MethodNames
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
 
 class AssertThatBooleanIsTrueOrFalseInspection : AbstractAssertJInspection() {
 
@@ -16,36 +22,25 @@ class AssertThatBooleanIsTrueOrFalseInspection : AbstractAssertJInspection() {
         return object : JavaElementVisitor() {
             override fun visitMethodCallExpression(expression: PsiMethodCallExpression) {
                 super.visitMethodCallExpression(expression)
-                val isEqualToObject = IS_EQUAL_TO_OBJECT.test(expression)
-                val isEqualToBoolean = IS_EQUAL_TO_BOOLEAN.test(expression)
-                val isNotEqualToObject = IS_NOT_EQUAL_TO_OBJECT.test(expression)
-                val isNotEqualToBoolean = IS_NOT_EQUAL_TO_BOOLEAN.test(expression)
-                val normalBooleanTest = isEqualToObject || isEqualToBoolean
-                val flippedBooleanTest = isNotEqualToObject || isNotEqualToBoolean
-                if (!(normalBooleanTest || flippedBooleanTest)) {
+                val matchingCalls = listOf(
+                    IS_EQUAL_TO_OBJECT, IS_EQUAL_TO_BOOLEAN,
+                    IS_NOT_EQUAL_TO_OBJECT, IS_NOT_EQUAL_TO_BOOLEAN
+                ).map { it.test(expression) }
+                if (matchingCalls.none { it }) {
                     return
                 }
                 if (!checkAssertedType(expression, ABSTRACT_BOOLEAN_ASSERT_CLASSNAME)) {
                     return
                 }
 
-                val equalToExpression = expression.argumentList.expressions[0] ?: return
-                if (!TypeConversionUtil.isBooleanType(equalToExpression.type)) {
+                val expectedExpression = expression.firstArg
+                if (!TypeConversionUtil.isBooleanType(expectedExpression.type)) {
                     return
                 }
-                var value = calculateConstantParameterValue(expression, 0)
-                if (value == null) {
-                    val field = (equalToExpression as? PsiReferenceExpression)?.resolve() as? PsiField
-                    if (field?.containingClass?.qualifiedName == CommonClassNames.JAVA_LANG_BOOLEAN) {
-                        when {
-                            field.name == "TRUE" -> value = true
-                            field.name == "FALSE" -> value = false
-                        }
-                    }
-                }
-                val expectedResult = value as? Boolean ?: return
+                val expectedResult = calculateConstantParameterValue(expression, 0) as? Boolean ?: return
+                val flippedBooleanTest = matchingCalls.drop(2).any { it }
 
-                val replacementMethod = if (expectedResult xor flippedBooleanTest) "isTrue()" else "isFalse()"
+                val replacementMethod = (expectedResult xor flippedBooleanTest).map(MethodNames.IS_TRUE, MethodNames.IS_FALSE)
                 registerSimplifyMethod(holder, expression, replacementMethod)
             }
         }

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatEnumerableIsEmptyInspection.kt

@@ -4,6 +4,7 @@ import com.intellij.codeInspection.ProblemsHolder
 import com.intellij.psi.JavaElementVisitor
 import com.intellij.psi.PsiElementVisitor
 import com.intellij.psi.PsiMethodCallExpression
+import de.platon42.intellij.plugins.cajon.MethodNames
 
 class AssertThatEnumerableIsEmptyInspection : AbstractAssertJInspection() {
 
@@ -17,14 +18,13 @@ class AssertThatEnumerableIsEmptyInspection : AbstractAssertJInspection() {
         return object : JavaElementVisitor() {
             override fun visitMethodCallExpression(expression: PsiMethodCallExpression) {
                 super.visitMethodCallExpression(expression)
-                val hasSize = HAS_SIZE.test(expression)
-                if (!hasSize) {
+                if (!HAS_SIZE.test(expression)) {
                     return
                 }
 
                 val value = calculateConstantParameterValue(expression, 0) ?: return
                 if (value == 0) {
-                    registerSimplifyMethod(holder, expression, "isEmpty()")
+                    registerSimplifyMethod(holder, expression, MethodNames.IS_EMPTY)
                 }
             }
         }

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatGuavaOptionalInspection.kt

@@ -0,0 +1,61 @@
+package de.platon42.intellij.plugins.cajon.inspections
+
+import com.intellij.codeInspection.ProblemsHolder
+import com.intellij.psi.*
+import com.intellij.psi.search.GlobalSearchScope
+import com.intellij.psi.util.PsiTreeUtil
+import de.platon42.intellij.plugins.cajon.AssertJClassNames
+import de.platon42.intellij.plugins.cajon.MethodNames
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
+
+class AssertThatGuavaOptionalInspection : AbstractAssertJInspection() {
+
+    companion object {
+        private const val DISPLAY_NAME = "Asserting an Optional (Guava)"
+    }
+
+    override fun getDisplayName() = DISPLAY_NAME
+
+    override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean): PsiElementVisitor {
+        return object : JavaElementVisitor() {
+            override fun visitMethodCallExpression(expression: PsiMethodCallExpression) {
+                super.visitMethodCallExpression(expression)
+                JavaPsiFacade.getInstance(expression.project)
+                    .findClass(AssertJClassNames.GUAVA_ASSERTIONS_CLASSNAME, GlobalSearchScope.allScope(expression.project)) ?: return
+                val assertThatGuava = ASSERT_THAT_GUAVA_OPTIONAL.test(expression)
+                if (!(ASSERT_THAT_ANY.test(expression) || assertThatGuava)) {
+                    return
+                }
+                val statement = PsiTreeUtil.getParentOfType(expression, PsiStatement::class.java) ?: return
+                val expectedCallExpression = PsiTreeUtil.findChildOfType(statement, PsiMethodCallExpression::class.java) ?: return
+
+                if (assertThatGuava) {
+                    if (IS_EQUAL_TO_OBJECT.test(expectedCallExpression)) {
+                        val innerExpectedCall = expectedCallExpression.firstArg as? PsiMethodCallExpression ?: return
+                        if (GUAVA_OPTIONAL_OF.test(innerExpectedCall) || GUAVA_OPTIONAL_FROM_NULLABLE.test(innerExpectedCall)) {
+                            registerRemoveExpectedOutmostMethod(holder, expression, expectedCallExpression, MethodNames.CONTAINS)
+                        } else if (GUAVA_OPTIONAL_ABSENT.test(innerExpectedCall)) {
+                            registerSimplifyMethod(holder, expectedCallExpression, MethodNames.IS_ABSENT)
+                        }
+                    } else if (IS_NOT_EQUAL_TO_OBJECT.test(expectedCallExpression)) {
+                        val innerExpectedCall = expectedCallExpression.firstArg as? PsiMethodCallExpression ?: return
+                        if (GUAVA_OPTIONAL_ABSENT.test(innerExpectedCall)) {
+                            registerSimplifyMethod(holder, expectedCallExpression, MethodNames.IS_PRESENT)
+                        }
+                    }
+                } else {
+                    val actualExpression = expression.firstArg as? PsiMethodCallExpression ?: return
+
+                    if (GUAVA_OPTIONAL_GET.test(actualExpression) && IS_EQUAL_TO_OBJECT.test(expectedCallExpression)) {
+                        registerRemoveActualOutmostMethod(holder, expression, expectedCallExpression, MethodNames.CONTAINS)
+                    } else if (GUAVA_OPTIONAL_IS_PRESENT.test(actualExpression)) {
+                        val expectedPresence = getExpectedBooleanResult(expectedCallExpression) ?: return
+                        val replacementMethod = expectedPresence.map(MethodNames.IS_PRESENT, MethodNames.IS_ABSENT)
+                        registerRemoveActualOutmostMethod(holder, expression, expectedCallExpression, replacementMethod, noExpectedExpression = true)
+                    }
+                }
+            }
+        }
+    }
+}

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatJava8OptionalInspection.kt

@@ -0,0 +1,63 @@
+package de.platon42.intellij.plugins.cajon.inspections
+
+import com.intellij.codeInspection.ProblemsHolder
+import com.intellij.psi.JavaElementVisitor
+import com.intellij.psi.PsiElementVisitor
+import com.intellij.psi.PsiMethodCallExpression
+import com.intellij.psi.PsiStatement
+import com.intellij.psi.util.PsiTreeUtil
+import de.platon42.intellij.plugins.cajon.MethodNames
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
+
+class AssertThatJava8OptionalInspection : AbstractAssertJInspection() {
+
+    companion object {
+        private const val DISPLAY_NAME = "Asserting an Optional (Java 8)"
+    }
+
+    override fun getDisplayName() = DISPLAY_NAME
+
+    override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean): PsiElementVisitor {
+        return object : JavaElementVisitor() {
+            override fun visitMethodCallExpression(expression: PsiMethodCallExpression) {
+                super.visitMethodCallExpression(expression)
+                if (!ASSERT_THAT_ANY.test(expression)) {
+                    return
+                }
+                val statement = PsiTreeUtil.getParentOfType(expression, PsiStatement::class.java) ?: return
+                val expectedCallExpression = PsiTreeUtil.findChildOfType(statement, PsiMethodCallExpression::class.java) ?: return
+
+                if (ASSERT_THAT_JAVA8_OPTIONAL.test(expression)) {
+                    if (IS_EQUAL_TO_OBJECT.test(expectedCallExpression)) {
+                        val innerExpectedCall = expectedCallExpression.firstArg as? PsiMethodCallExpression ?: return
+                        if (OPTIONAL_OF.test(innerExpectedCall) || OPTIONAL_OF_NULLABLE.test(innerExpectedCall)) {
+                            registerRemoveExpectedOutmostMethod(holder, expression, expectedCallExpression, MethodNames.CONTAINS)
+                        } else if (OPTIONAL_EMPTY.test(innerExpectedCall)) {
+                            registerSimplifyMethod(holder, expectedCallExpression, MethodNames.IS_NOT_PRESENT)
+                        }
+                    } else if (IS_NOT_EQUAL_TO_OBJECT.test(expectedCallExpression)) {
+                        val innerExpectedCall = expectedCallExpression.firstArg as? PsiMethodCallExpression ?: return
+                        if (OPTIONAL_EMPTY.test(innerExpectedCall)) {
+                            registerSimplifyMethod(holder, expectedCallExpression, MethodNames.IS_PRESENT)
+                        }
+                    }
+                } else {
+                    val actualExpression = expression.firstArg as? PsiMethodCallExpression ?: return
+
+                    if (OPTIONAL_GET.test(actualExpression)) {
+                        if (IS_EQUAL_TO_OBJECT.test(expectedCallExpression)) {
+                            registerRemoveActualOutmostMethod(holder, expression, expectedCallExpression, MethodNames.CONTAINS)
+                        } else if (IS_SAME_AS_OBJECT.test(expectedCallExpression)) {
+                            registerRemoveActualOutmostMethod(holder, expression, expectedCallExpression, MethodNames.CONTAINS_SAME)
+                        }
+                    } else if (OPTIONAL_IS_PRESENT.test(actualExpression)) {
+                        val expectedPresence = getExpectedBooleanResult(expectedCallExpression) ?: return
+                        val replacementMethod = expectedPresence.map(MethodNames.IS_PRESENT, MethodNames.IS_NOT_PRESENT)
+                        registerRemoveActualOutmostMethod(holder, expression, expectedCallExpression, replacementMethod, noExpectedExpression = true)
+                    }
+                }
+            }
+        }
+    }
+}

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatObjectIsNullOrNotNullInspection.kt

@@ -5,6 +5,9 @@ import com.intellij.psi.JavaElementVisitor
 import com.intellij.psi.PsiElementVisitor
 import com.intellij.psi.PsiMethodCallExpression
 import com.intellij.psi.PsiType
+import de.platon42.intellij.plugins.cajon.MethodNames
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
 
 class AssertThatObjectIsNullOrNotNullInspection : AbstractAssertJInspection() {
 
@@ -24,8 +27,8 @@ class AssertThatObjectIsNullOrNotNullInspection : AbstractAssertJInspection() {
                     return
                 }
 
-                if (expression.argumentList.expressions[0].type == PsiType.NULL) {
-                    registerSimplifyMethod(holder, expression, if (isEqualTo) "isNull()" else "isNotNull()")
+                if (expression.firstArg.type == PsiType.NULL) {
+                    registerSimplifyMethod(holder, expression, isEqualTo.map(MethodNames.IS_NULL, MethodNames.IS_NOT_NULL))
                 }
             }
         }

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatSizeInspection.kt

@@ -3,13 +3,23 @@ package de.platon42.intellij.plugins.cajon.inspections
 import com.intellij.codeInspection.ProblemsHolder
 import com.intellij.psi.*
 import com.intellij.psi.util.PsiTreeUtil
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ABSTRACT_ITERABLE_ASSERT_CLASSNAME
+import de.platon42.intellij.plugins.cajon.MethodNames
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
 import de.platon42.intellij.plugins.cajon.quickfixes.ReplaceSizeMethodCallQuickFix
 
 class AssertThatSizeInspection : AbstractAssertJInspection() {
 
     companion object {
         private const val DISPLAY_NAME = "Asserting the size of an collection or array"
-        private const val MORE_CONCISE_MESSAGE_TEMPLATE = "%s would be more concise than %s"
+
+        private val BONUS_EXPRESSIONS_CALL_MATCHER_MAP = listOf(
+            IS_LESS_THAN_INT to MethodNames.HAS_SIZE_LESS_THAN,
+            IS_LESS_THAN_OR_EQUAL_TO_INT to MethodNames.HAS_SIZE_LESS_THAN_OR_EQUAL_TO,
+            IS_GREATER_THAN_INT to MethodNames.HAS_SIZE_GREATER_THAN,
+            IS_GREATER_THAN_OR_EQUAL_TO_INT to MethodNames.HAS_SIZE_GREATER_THAN_OR_EQUAL_TO
+        )
     }
 
     override fun getDisplayName() = DISPLAY_NAME
@@ -21,7 +31,7 @@ class AssertThatSizeInspection : AbstractAssertJInspection() {
                 if (!ASSERT_THAT_INT.test(expression)) {
                     return
                 }
-                val actualExpression = expression.argumentList.expressions[0] ?: return
+                val actualExpression = expression.firstArg
 
                 if (isArrayLength(actualExpression) || isCollectionSize(actualExpression)) {
                     val statement = PsiTreeUtil.getParentOfType(expression, PsiStatement::class.java) ?: return
@@ -29,43 +39,30 @@ class AssertThatSizeInspection : AbstractAssertJInspection() {
                     val constValue = calculateConstantParameterValue(expectedCallExpression, 0)
                     if (IS_EQUAL_TO_INT.test(expectedCallExpression)) {
                         if (constValue == 0) {
-                            registerSizeMethod(holder, expression, expectedCallExpression, "isEmpty()", noExpectedExpression = true)
-                            return
-                        }
-                        val equalToExpression = expectedCallExpression.argumentList.expressions[0]
-                        if (isCollectionSize(equalToExpression) || isArrayLength(equalToExpression)) {
-                            registerSizeMethod(holder, expression, expectedCallExpression, "hasSameSizeAs()", expectedIsCollection = true)
-                            return
-                        }
-                        registerSizeMethod(holder, expression, expectedCallExpression, "hasSize()")
-                    } else {
-                        if ((IS_LESS_THAN_OR_EQUAL_TO_INT.test(expectedCallExpression) && (constValue == 0))
-                            || (IS_LESS_THAN_INT.test(expectedCallExpression) && (constValue == 1))
-                            || IS_ZERO.test(expectedCallExpression)
-                        ) {
-                            registerSizeMethod(holder, expression, expectedCallExpression, "isEmpty()", noExpectedExpression = true)
-                            return
-                        }
-                        if ((IS_GREATER_THAN_INT.test(expectedCallExpression) && (constValue == 0))
-                            || (IS_GREATER_THAN_OR_EQUAL_TO_INT.test(expectedCallExpression) && (constValue == 1))
-                            || IS_NOT_ZERO.test(expectedCallExpression)
-                        ) {
-                            registerSizeMethod(holder, expression, expectedCallExpression, "isNotEmpty()", noExpectedExpression = true)
-                            return
-                        }
-                        // new stuff in AssertJ 13.2.0
-                        if (hasAssertJMethod(expression, "AbstractIterableAssert.hasSizeLessThan")) {
-                            val matchedMethod = listOf(
-                                Pair(IS_GREATER_THAN_INT, "hasSizeGreaterThan()"),
-                                Pair(IS_GREATER_THAN_OR_EQUAL_TO_INT, "hasSizeGreaterThanOrEqualTo()"),
-                                Pair(IS_LESS_THAN_OR_EQUAL_TO_INT, "hasSizeLessThanOrEqualTo()"),
-                                Pair(IS_LESS_THAN_INT, "hasSizeLessThan()")
-                            ).find { it.first.test(expectedCallExpression) }?.second
-                            if (matchedMethod != null) {
-                                registerSizeMethod(holder, expression, expectedCallExpression, matchedMethod)
-                                return
+                            registerReplaceSizeMethod(holder, expression, expectedCallExpression, MethodNames.IS_EMPTY, noExpectedExpression = true)
+                        } else {
+                            val equalToExpression = expectedCallExpression.firstArg
+                            if (isCollectionSize(equalToExpression) || isArrayLength(equalToExpression)) {
+                                registerReplaceSizeMethod(holder, expression, expectedCallExpression, MethodNames.HAS_SAME_SIZE_AS, expectedIsCollection = true)
+                            } else {
+                                registerReplaceSizeMethod(holder, expression, expectedCallExpression, MethodNames.HAS_SIZE)
                             }
                         }
+                    } else {
+                        val isTestForEmpty = ((IS_LESS_THAN_OR_EQUAL_TO_INT.test(expectedCallExpression) && (constValue == 0))
+                                || (IS_LESS_THAN_INT.test(expectedCallExpression) && (constValue == 1))
+                                || IS_ZERO.test(expectedCallExpression))
+                        val isTestForNotEmpty = ((IS_GREATER_THAN_INT.test(expectedCallExpression) && (constValue == 0))
+                                || (IS_GREATER_THAN_OR_EQUAL_TO_INT.test(expectedCallExpression) && (constValue == 1))
+                                || IS_NOT_ZERO.test(expectedCallExpression))
+                        if (isTestForEmpty || isTestForNotEmpty) {
+                            val replacementMethod = isTestForEmpty.map(MethodNames.IS_EMPTY, MethodNames.IS_NOT_EMPTY)
+                            registerReplaceSizeMethod(holder, expression, expectedCallExpression, replacementMethod, noExpectedExpression = true)
+                        } else if (hasAssertJMethod(expression, ABSTRACT_ITERABLE_ASSERT_CLASSNAME, MethodNames.HAS_SIZE_LESS_THAN)) {
+                            // new stuff in AssertJ 13.2.0
+                            val matchedMethod = BONUS_EXPRESSIONS_CALL_MATCHER_MAP.find { it.first.test(expectedCallExpression) }?.second ?: return
+                            registerReplaceSizeMethod(holder, expression, expectedCallExpression, matchedMethod)
+                        }
                     }
                 }
             }
@@ -78,7 +75,7 @@ class AssertThatSizeInspection : AbstractAssertJInspection() {
                         && ((psiReferenceExpression.resolve() as? PsiField)?.name == "length"))
             }
 
-            private fun registerSizeMethod(
+            private fun registerReplaceSizeMethod(
                 holder: ProblemsHolder,
                 expression: PsiMethodCallExpression,
                 expectedCallExpression: PsiMethodCallExpression,
@@ -89,11 +86,8 @@ class AssertThatSizeInspection : AbstractAssertJInspection() {
                 val originalMethod = getOriginalMethodName(expectedCallExpression) ?: return
                 val description = REPLACE_DESCRIPTION_TEMPLATE.format(originalMethod, replacementMethod)
                 val message = MORE_CONCISE_MESSAGE_TEMPLATE.format(replacementMethod, originalMethod)
-                holder.registerProblem(
-                    expression,
-                    message,
-                    ReplaceSizeMethodCallQuickFix(description, replacementMethod, noExpectedExpression, expectedIsCollection)
-                )
+                val quickfix = ReplaceSizeMethodCallQuickFix(description, replacementMethod, noExpectedExpression, expectedIsCollection)
+                holder.registerProblem(expression, message, quickfix)
             }
         }
     }

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatStringIsEmptyInspection.kt

@@ -4,6 +4,8 @@ import com.intellij.codeInspection.ProblemsHolder
 import com.intellij.psi.JavaElementVisitor
 import com.intellij.psi.PsiElementVisitor
 import com.intellij.psi.PsiMethodCallExpression
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ABSTRACT_CHAR_SEQUENCE_ASSERT_CLASSNAME
+import de.platon42.intellij.plugins.cajon.MethodNames
 
 class AssertThatStringIsEmptyInspection : AbstractAssertJInspection() {
 
@@ -29,7 +31,7 @@ class AssertThatStringIsEmptyInspection : AbstractAssertJInspection() {
 
                 val value = calculateConstantParameterValue(expression, 0) ?: return
                 if ((isEqual && (value == "")) || (hasSize && (value == 0))) {
-                    registerSimplifyMethod(holder, expression, "isEmpty()")
+                    registerSimplifyMethod(holder, expression, MethodNames.IS_EMPTY)
                 }
             }
         }

src/main/java/de/platon42/intellij/plugins/cajon/inspections/JUnitAssertToAssertJInspection.kt

@@ -1,12 +1,12 @@
 package de.platon42.intellij.plugins.cajon.inspections
 
 import com.intellij.codeInspection.ProblemsHolder
-import com.intellij.psi.CommonClassNames
-import com.intellij.psi.JavaElementVisitor
-import com.intellij.psi.PsiElementVisitor
-import com.intellij.psi.PsiMethodCallExpression
+import com.intellij.psi.*
+import com.intellij.psi.search.GlobalSearchScope
 import com.siyeh.ig.callMatcher.CallMatcher
 import com.siyeh.ig.callMatcher.CallMatcher.anyOf
+import de.platon42.intellij.plugins.cajon.AssertJClassNames
+import de.platon42.intellij.plugins.cajon.MethodNames
 import de.platon42.intellij.plugins.cajon.quickfixes.ReplaceJUnitAssertMethodCallQuickFix
 import de.platon42.intellij.plugins.cajon.quickfixes.ReplaceJUnitDeltaAssertMethodCallQuickFix
 
@@ -21,28 +21,28 @@ class JUnitAssertToAssertJInspection : AbstractJUnitAssertInspection() {
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_TRUE_METHOD).parameterTypes(CommonClassNames.JAVA_LANG_STRING, "boolean"),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_TRUE_METHOD).parameterTypes("boolean")
                 ),
-                "isTrue()", false
+                MethodNames.IS_TRUE, false
             ),
             Mapping(
                 anyOf(
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_FALSE_METHOD).parameterTypes(CommonClassNames.JAVA_LANG_STRING, "boolean"),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_FALSE_METHOD).parameterTypes("boolean")
                 ),
-                "isFalse()", false
+                MethodNames.IS_FALSE, false
             ),
             Mapping(
                 anyOf(
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NULL_METHOD).parameterTypes(CommonClassNames.JAVA_LANG_STRING, CommonClassNames.JAVA_LANG_OBJECT),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NULL_METHOD).parameterTypes(CommonClassNames.JAVA_LANG_OBJECT)
                 ),
-                "isNull()", false
+                MethodNames.IS_NULL, false
             ),
             Mapping(
                 anyOf(
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NOT_NULL_METHOD).parameterTypes(CommonClassNames.JAVA_LANG_STRING, CommonClassNames.JAVA_LANG_OBJECT),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NOT_NULL_METHOD).parameterTypes(CommonClassNames.JAVA_LANG_OBJECT)
                 ),
-                "isNotNull()", false
+                MethodNames.IS_NOT_NULL, false
             ),
             Mapping(
                 anyOf(
@@ -51,14 +51,14 @@ class JUnitAssertToAssertJInspection : AbstractJUnitAssertInspection() {
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_EQUALS_METHOD).parameterTypes(CommonClassNames.JAVA_LANG_STRING, "float", "float", "float"),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_EQUALS_METHOD).parameterTypes("float", "float", "float")
                 ),
-                "isCloseTo()", hasDelta = true
+                MethodNames.IS_CLOSE_TO, hasDelta = true
             ),
             Mapping(
                 anyOf(
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_EQUALS_METHOD).parameterCount(3),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_EQUALS_METHOD).parameterCount(2)
                 ),
-                "isEqualTo()"
+                MethodNames.IS_EQUAL_TO
             ),
             Mapping(
                 anyOf(
@@ -67,28 +67,28 @@ class JUnitAssertToAssertJInspection : AbstractJUnitAssertInspection() {
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NOT_EQUALS_METHOD).parameterTypes(CommonClassNames.JAVA_LANG_STRING, "float", "float", "float"),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NOT_EQUALS_METHOD).parameterTypes("float", "float", "float")
                 ),
-                "isNotCloseTo()", hasDelta = true
+                MethodNames.IS_NOT_CLOSE_TO, hasDelta = true
             ),
             Mapping(
                 anyOf(
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NOT_EQUALS_METHOD).parameterCount(3),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NOT_EQUALS_METHOD).parameterCount(2)
                 ),
-                "isNotEqualTo()"
+                MethodNames.IS_NOT_EQUAL_TO
             ),
             Mapping(
                 anyOf(
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_SAME_METHOD).parameterCount(3),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_SAME_METHOD).parameterCount(2)
                 ),
-                "isSameAs()"
+                MethodNames.IS_SAME_AS
             ),
             Mapping(
                 anyOf(
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NOT_SAME_METHOD).parameterCount(3),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_NOT_SAME_METHOD).parameterCount(2)
                 ),
-                "isNotSameAs()"
+                MethodNames.IS_NOT_SAME_AS
             ),
             Mapping(
                 anyOf(
@@ -97,14 +97,14 @@ class JUnitAssertToAssertJInspection : AbstractJUnitAssertInspection() {
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_ARRAY_EQUALS_METHOD).parameterTypes(CommonClassNames.JAVA_LANG_STRING, "float[]", "float[]", "float"),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_ARRAY_EQUALS_METHOD).parameterTypes("float[]", "float[]", "float")
                 ),
-                "containsExactly()", hasDelta = true
+                MethodNames.CONTAINS_EXACTLY, hasDelta = true
             ),
             Mapping(
                 anyOf(
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_ARRAY_EQUALS_METHOD).parameterCount(2),
                     CallMatcher.staticCall(JUNIT_ASSERT_CLASSNAME, ASSERT_ARRAY_EQUALS_METHOD).parameterCount(3)
                 ),
-                "containsExactly()"
+                MethodNames.CONTAINS_EXACTLY
             )
         )
     }
@@ -119,6 +119,8 @@ class JUnitAssertToAssertJInspection : AbstractJUnitAssertInspection() {
                 if (!isJUnitAssertCall) {
                     return // early exit
                 }
+                JavaPsiFacade.getInstance(expression.project)
+                    .findClass(AssertJClassNames.ASSERTIONS_CLASSNAME, GlobalSearchScope.allScope(expression.project)) ?: return
                 for (mapping in MAPPINGS) {
                     if (mapping.callMatcher.test(expression)) {
                         if (mapping.hasDelta) {
@@ -142,11 +144,8 @@ class JUnitAssertToAssertJInspection : AbstractJUnitAssertInspection() {
         val originalMethod = getOriginalMethodName(expression) ?: return
         val description = REPLACE_DESCRIPTION_TEMPLATE.format(originalMethod, replacementMethod)
         val message = CONVERT_MESSAGE_TEMPLATE.format(originalMethod)
-        holder.registerProblem(
-            expression,
-            message,
-            ReplaceJUnitAssertMethodCallQuickFix(description, hasExpected, replacementMethod)
-        )
+        val quickFix = ReplaceJUnitAssertMethodCallQuickFix(description, !hasExpected, replacementMethod)
+        holder.registerProblem(expression, message, quickFix)
     }
 
     private fun registerDeltaReplacementMethod(
@@ -157,11 +156,8 @@ class JUnitAssertToAssertJInspection : AbstractJUnitAssertInspection() {
         val originalMethod = getOriginalMethodName(expression) ?: return
         val description = REPLACE_DESCRIPTION_TEMPLATE.format(originalMethod, replacementMethod)
         val message = CONVERT_MESSAGE_TEMPLATE.format(originalMethod)
-        holder.registerProblem(
-            expression,
-            message,
-            ReplaceJUnitDeltaAssertMethodCallQuickFix(description, replacementMethod)
-        )
+        val quickFix = ReplaceJUnitDeltaAssertMethodCallQuickFix(description, replacementMethod)
+        holder.registerProblem(expression, message, quickFix)
     }
 
     private class Mapping(

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/AbstractCommonQuickFix.kt

@@ -1,21 +1,15 @@
 package de.platon42.intellij.plugins.cajon.quickfixes
 
 import com.intellij.codeInspection.LocalQuickFix
-import com.intellij.psi.PsiElementFactory
-import com.intellij.psi.PsiJavaFile
-import com.intellij.psi.PsiMethod
-import com.intellij.psi.PsiMethodCallExpression
-import org.jetbrains.annotations.NonNls
+import com.intellij.psi.*
+import de.platon42.intellij.plugins.cajon.AssertJClassNames
+import de.platon42.intellij.plugins.cajon.MethodNames
+import de.platon42.intellij.plugins.cajon.firstArg
 
 abstract class AbstractCommonQuickFix(private val description: String) : LocalQuickFix {
 
     override fun getFamilyName() = description
 
-    companion object {
-        @NonNls
-        const val GUAVA_ASSERTIONS_CLASSNAME = "org.assertj.guava.api.Assertions"
-    }
-
     protected fun addStaticImport(method: PsiMethod, element: PsiMethodCallExpression, factory: PsiElementFactory, vararg allowedClashes: String) {
         val methodName = method.name
         val containingClass = method.containingClass ?: return
@@ -29,4 +23,13 @@ abstract class AbstractCommonQuickFix(private val description: String) : LocalQu
             importList.add(factory.createImportStaticStatement(containingClass, methodName))
         }
     }
+
+    protected fun createAssertThat(context: PsiElement, actualExpression: PsiExpression): PsiMethodCallExpression {
+        val factory = JavaPsiFacade.getElementFactory(context.project)
+        val newMethodCall = factory.createExpressionFromText(
+            "${AssertJClassNames.ASSERTIONS_CLASSNAME}.${MethodNames.ASSERT_THAT}(a)", context
+        ) as PsiMethodCallExpression
+        newMethodCall.firstArg.replace(actualExpression)
+        return newMethodCall
+    }
 }

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/RemoveActualOutmostMethodCallQuickFix.kt

@@ -0,0 +1,38 @@
+package de.platon42.intellij.plugins.cajon.quickfixes
+
+import com.intellij.codeInspection.ProblemDescriptor
+import com.intellij.openapi.project.Project
+import com.intellij.psi.JavaPsiFacade
+import com.intellij.psi.PsiMethodCallExpression
+import com.intellij.psi.PsiStatement
+import com.intellij.psi.util.PsiTreeUtil
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
+import de.platon42.intellij.plugins.cajon.qualifierExpression
+import de.platon42.intellij.plugins.cajon.replaceQualifierFromMethodCall
+
+class RemoveActualOutmostMethodCallQuickFix(
+    description: String,
+    private val replacementMethod: String,
+    private val noExpectedExpression: Boolean
+) : AbstractCommonQuickFix(description) {
+
+    override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
+        val element = descriptor.startElement
+        val methodCallExpression = element as? PsiMethodCallExpression ?: return
+        val assertExpression = methodCallExpression.firstArg as? PsiMethodCallExpression ?: return
+        assertExpression.replace(assertExpression.qualifierExpression)
+        val statement = PsiTreeUtil.getParentOfType(element, PsiStatement::class.java) ?: return
+        val oldExpectedExpression = PsiTreeUtil.findChildOfType(statement, PsiMethodCallExpression::class.java) ?: return
+
+        val factory = JavaPsiFacade.getElementFactory(element.project)
+        val expectedExpression = factory.createExpressionFromText(
+            "a.$replacementMethod${noExpectedExpression.map("()", "(e)")}", element
+        ) as PsiMethodCallExpression
+        if (!noExpectedExpression) {
+            expectedExpression.firstArg.replace(oldExpectedExpression.firstArg)
+        }
+        expectedExpression.replaceQualifierFromMethodCall(oldExpectedExpression)
+        oldExpectedExpression.replace(expectedExpression)
+    }
+}

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/RemoveExpectedOutmostMethodCallQuickFix.kt

@@ -0,0 +1,27 @@
+package de.platon42.intellij.plugins.cajon.quickfixes
+
+import com.intellij.codeInspection.ProblemDescriptor
+import com.intellij.openapi.project.Project
+import com.intellij.psi.JavaPsiFacade
+import com.intellij.psi.PsiMethodCallExpression
+import com.intellij.psi.PsiStatement
+import com.intellij.psi.util.PsiTreeUtil
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.replaceQualifierFromMethodCall
+
+class RemoveExpectedOutmostMethodCallQuickFix(description: String, private val replacementMethod: String) : AbstractCommonQuickFix(description) {
+
+    override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
+        val element = descriptor.startElement
+        val statement = PsiTreeUtil.getParentOfType(element, PsiStatement::class.java) ?: return
+        val oldExpectedExpression = PsiTreeUtil.findChildOfType(statement, PsiMethodCallExpression::class.java) ?: return
+
+        val factory = JavaPsiFacade.getElementFactory(element.project)
+        val expectedExpression =
+            factory.createExpressionFromText("a.$replacementMethod(e)", element) as PsiMethodCallExpression
+        val expectedMethodCallExpression = oldExpectedExpression.firstArg as? PsiMethodCallExpression ?: return
+        expectedExpression.firstArg.replace(expectedMethodCallExpression.firstArg)
+        expectedExpression.replaceQualifierFromMethodCall(oldExpectedExpression)
+        oldExpectedExpression.replace(expectedExpression)
+    }
+}

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/ReplaceJUnitAssertMethodCallQuickFix.kt

@@ -6,45 +6,47 @@ import com.intellij.psi.JavaPsiFacade
 import com.intellij.psi.PsiMethodCallExpression
 import com.intellij.psi.codeStyle.CodeStyleManager
 import com.intellij.psi.codeStyle.JavaCodeStyleManager
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.GUAVA_ASSERTIONS_CLASSNAME
+import de.platon42.intellij.plugins.cajon.MethodNames
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
+import de.platon42.intellij.plugins.cajon.replaceQualifier
 
-class ReplaceJUnitAssertMethodCallQuickFix(description: String, private val hasExpected: Boolean, private val replacementMethod: String) :
+class ReplaceJUnitAssertMethodCallQuickFix(description: String, private val noExpectedExpression: Boolean, private val replacementMethod: String) :
     AbstractCommonQuickFix(description) {
 
     override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
         val element = descriptor.startElement
-        val factory = JavaPsiFacade.getElementFactory(element.project)
         val methodCallExpression = element as? PsiMethodCallExpression ?: return
         val args = methodCallExpression.argumentList
-        val count = args.expressionCount
+        val count = args.expressions.size
         val actualExpression = args.expressions[count - 1] ?: return
-        val (expectedExpression, messageExpression) = if (hasExpected) {
+        val (expectedExpression, messageExpression) = if (noExpectedExpression) {
+            val message = if (count > 1) args.expressions[0] else null
+            null to message
+        } else {
             val expected = args.expressions[count - 2] ?: return
             val message = if (count > 2) args.expressions[0] else null
-            Pair(expected, message)
-        } else {
-            val message = if (count > 1) args.expressions[0] else null
-            Pair(null, message)
+            expected to message
         }
 
+        val factory = JavaPsiFacade.getElementFactory(element.project)
         val expectedMethodCall = factory.createExpressionFromText(
-            "a.${if (hasExpected) replacementMethod.replace("()", "(e)") else replacementMethod}", element
+            "a.$replacementMethod${noExpectedExpression.map("()", "(e)")}", element
         ) as PsiMethodCallExpression
-        if (hasExpected) {
-            expectedMethodCall.argumentList.expressions[0].replace(expectedExpression!!)
+        if (!noExpectedExpression) {
+            expectedMethodCall.firstArg.replace(expectedExpression!!)
         }
 
-        val newMethodCall = factory.createExpressionFromText(
-            "org.assertj.core.api.Assertions.assertThat(a)", element
-        ) as PsiMethodCallExpression
-        newMethodCall.argumentList.expressions[0].replace(actualExpression)
+        val newMethodCall = createAssertThat(element, actualExpression)
 
         if (messageExpression != null) {
-            val asExpression = factory.createExpressionFromText("a.as(desc)", element) as PsiMethodCallExpression
-            asExpression.argumentList.expressions[0].replace(messageExpression)
-            asExpression.methodExpression.qualifierExpression!!.replace(newMethodCall)
-            expectedMethodCall.methodExpression.qualifierExpression!!.replace(asExpression)
+            val asExpression = factory.createExpressionFromText("a.${MethodNames.AS}(desc)", element) as PsiMethodCallExpression
+            asExpression.firstArg.replace(messageExpression)
+            asExpression.replaceQualifier(newMethodCall)
+            expectedMethodCall.replaceQualifier(asExpression)
         } else {
-            expectedMethodCall.methodExpression.qualifierExpression!!.replace(newMethodCall)
+            expectedMethodCall.replaceQualifier(newMethodCall)
         }
 
         val assertThatMethod = newMethodCall.resolveMethod() ?: return

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/ReplaceJUnitDeltaAssertMethodCallQuickFix.kt

@@ -6,45 +6,46 @@ import com.intellij.psi.JavaPsiFacade
 import com.intellij.psi.PsiMethodCallExpression
 import com.intellij.psi.codeStyle.CodeStyleManager
 import com.intellij.psi.codeStyle.JavaCodeStyleManager
+import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.GUAVA_ASSERTIONS_CLASSNAME
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.getArg
+import de.platon42.intellij.plugins.cajon.replaceQualifier
 
 class ReplaceJUnitDeltaAssertMethodCallQuickFix(description: String, private val replacementMethod: String) : AbstractCommonQuickFix(description) {
 
     override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
         val element = descriptor.startElement
-        val factory = JavaPsiFacade.getElementFactory(element.project)
         val methodCallExpression = element as? PsiMethodCallExpression ?: return
         val args = methodCallExpression.argumentList
-        val count = args.expressionCount
+        val count = args.expressions.size
         val actualExpression = args.expressions[count - 2] ?: return
         val messageExpression = if (count > 3) args.expressions[0] else null
         val expectedExpression = args.expressions[count - 3] ?: return
         val deltaExpression = args.expressions[count - 1] ?: return
 
+        val factory = JavaPsiFacade.getElementFactory(element.project)
         val offsetMethodCall = factory.createExpressionFromText(
             "org.assertj.core.data.Offset.offset(c)", element
         ) as PsiMethodCallExpression
 
-        offsetMethodCall.argumentList.expressions[0].replace(deltaExpression)
+        offsetMethodCall.firstArg.replace(deltaExpression)
 
         val expectedMethodCall = factory.createExpressionFromText(
-            "a.${replacementMethod.removeSuffix("()")}(e, offs)", element
+            "a.$replacementMethod(e, offs)", element
         ) as PsiMethodCallExpression
 
-        expectedMethodCall.argumentList.expressions[0].replace(expectedExpression)
-        expectedMethodCall.argumentList.expressions[1].replace(offsetMethodCall)
+        expectedMethodCall.firstArg.replace(expectedExpression)
+        expectedMethodCall.getArg(1).replace(offsetMethodCall)
 
-        val newMethodCall = factory.createExpressionFromText(
-            "org.assertj.core.api.Assertions.assertThat(a)", element
-        ) as PsiMethodCallExpression
-        newMethodCall.argumentList.expressions[0].replace(actualExpression)
+        val newMethodCall = createAssertThat(element, actualExpression)
 
         if (messageExpression != null) {
             val asExpression = factory.createExpressionFromText("a.as(desc)", element) as PsiMethodCallExpression
-            asExpression.argumentList.expressions[0].replace(messageExpression)
-            asExpression.methodExpression.qualifierExpression!!.replace(newMethodCall)
-            expectedMethodCall.methodExpression.qualifierExpression!!.replace(asExpression)
+            asExpression.firstArg.replace(messageExpression)
+            asExpression.replaceQualifier(newMethodCall)
+            expectedMethodCall.replaceQualifier(asExpression)
         } else {
-            expectedMethodCall.methodExpression.qualifierExpression!!.replace(newMethodCall)
+            expectedMethodCall.replaceQualifier(newMethodCall)
         }
 
         val assertThatMethod = newMethodCall.resolveMethod() ?: return

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/ReplaceSimpleMethodCallQuickFix.kt

@@ -4,17 +4,18 @@ import com.intellij.codeInspection.ProblemDescriptor
 import com.intellij.openapi.project.Project
 import com.intellij.psi.JavaPsiFacade
 import com.intellij.psi.PsiMethodCallExpression
+import de.platon42.intellij.plugins.cajon.replaceQualifierFromMethodCall
 
 class ReplaceSimpleMethodCallQuickFix(description: String, private val replacementMethod: String) : AbstractCommonQuickFix(description) {
 
     override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
         val element = descriptor.startElement
-        val factory = JavaPsiFacade.getElementFactory(element.project)
         val methodCallExpression = element as? PsiMethodCallExpression ?: return
-        val oldQualifier = methodCallExpression.methodExpression.qualifierExpression ?: return
+
+        val factory = JavaPsiFacade.getElementFactory(element.project)
         val expectedExpression =
-            factory.createExpressionFromText("a.$replacementMethod", element) as PsiMethodCallExpression
-        expectedExpression.methodExpression.qualifierExpression!!.replace(oldQualifier)
+            factory.createExpressionFromText("a.$replacementMethod()", element) as PsiMethodCallExpression
+        expectedExpression.replaceQualifierFromMethodCall(methodCallExpression)
         element.replace(expectedExpression)
     }
 }

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/ReplaceSizeMethodCallQuickFix.kt

@@ -4,6 +4,10 @@ import com.intellij.codeInspection.ProblemDescriptor
 import com.intellij.openapi.project.Project
 import com.intellij.psi.*
 import com.intellij.psi.util.PsiTreeUtil
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
+import de.platon42.intellij.plugins.cajon.qualifierExpression
+import de.platon42.intellij.plugins.cajon.replaceQualifierFromMethodCall
 
 class ReplaceSizeMethodCallQuickFix(
     description: String,
@@ -14,21 +18,23 @@ class ReplaceSizeMethodCallQuickFix(
 
     override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
         val element = descriptor.startElement
-        val factory = JavaPsiFacade.getElementFactory(element.project)
         val methodCallExpression = element as? PsiMethodCallExpression ?: return
-        val assertExpression = methodCallExpression.argumentList.expressions[0] ?: return
+        val assertExpression = methodCallExpression.firstArg
         replaceCollectionSizeOrArrayLength(assertExpression)
         val statement = PsiTreeUtil.getParentOfType(element, PsiStatement::class.java) ?: return
         val oldExpectedExpression = PsiTreeUtil.findChildOfType(statement, PsiMethodCallExpression::class.java) ?: return
-        val expectedExpression =
-            factory.createExpressionFromText("a.${if (noExpectedExpression) replacementMethod else replacementMethod.replace("()", "(e)")}", element) as PsiMethodCallExpression
+
+        val factory = JavaPsiFacade.getElementFactory(element.project)
+        val expectedExpression = factory.createExpressionFromText(
+            "a.$replacementMethod${noExpectedExpression.map("()", "(e)")}", element
+        ) as PsiMethodCallExpression
         if (!noExpectedExpression) {
             if (expectedIsCollection) {
-                replaceCollectionSizeOrArrayLength(oldExpectedExpression.argumentList.expressions[0])
+                replaceCollectionSizeOrArrayLength(oldExpectedExpression.firstArg)
             }
-            expectedExpression.argumentList.expressions[0].replace(oldExpectedExpression.argumentList.expressions[0])
+            expectedExpression.firstArg.replace(oldExpectedExpression.firstArg)
         }
-        expectedExpression.methodExpression.qualifierExpression!!.replace(oldExpectedExpression.methodExpression.qualifierExpression!!)
+        expectedExpression.replaceQualifierFromMethodCall(oldExpectedExpression)
         oldExpectedExpression.replace(expectedExpression)
     }
 
@@ -36,7 +42,7 @@ class ReplaceSizeMethodCallQuickFix(
         assertExpression.replace(
             when (assertExpression) {
                 is PsiReferenceExpression -> assertExpression.qualifierExpression!!
-                is PsiMethodCallExpression -> assertExpression.methodExpression.qualifierExpression!!
+                is PsiMethodCallExpression -> assertExpression.qualifierExpression
                 else -> return
             }
         )

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/SplitBinaryExpressionMethodCallQuickFix.kt

@@ -7,6 +7,9 @@ import com.intellij.psi.PsiBinaryExpression
 import com.intellij.psi.PsiMethodCallExpression
 import com.intellij.psi.PsiStatement
 import com.intellij.psi.util.PsiTreeUtil
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.map
+import de.platon42.intellij.plugins.cajon.replaceQualifierFromMethodCall
 
 class SplitBinaryExpressionMethodCallQuickFix(
     description: String,
@@ -17,20 +20,22 @@ class SplitBinaryExpressionMethodCallQuickFix(
 
     override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
         val element = descriptor.startElement
-        val factory = JavaPsiFacade.getElementFactory(element.project)
         val methodCallExpression = element as? PsiMethodCallExpression ?: return
-        val binaryExpression = methodCallExpression.argumentList.expressions[0] as? PsiBinaryExpression ?: return
+        val binaryExpression = methodCallExpression.firstArg as? PsiBinaryExpression ?: return
         val expectedArgument = (if (pickRightOperand) binaryExpression.lOperand else binaryExpression.rOperand)?.copy() ?: return
         binaryExpression.replace(if (pickRightOperand) binaryExpression.rOperand!! else binaryExpression.lOperand)
 
         val statement = PsiTreeUtil.getParentOfType(element, PsiStatement::class.java) ?: return
         val oldExpectedExpression = PsiTreeUtil.findChildOfType(statement, PsiMethodCallExpression::class.java) ?: return
-        val expectedExpression =
-            factory.createExpressionFromText("a.${if (noExpectedExpression) replacementMethod else replacementMethod.replace("()", "(e)")}", element) as PsiMethodCallExpression
+
+        val factory = JavaPsiFacade.getElementFactory(element.project)
+        val expectedExpression = factory.createExpressionFromText(
+            "a.$replacementMethod${noExpectedExpression.map("()", "(e)")}", element
+        ) as PsiMethodCallExpression
         if (!noExpectedExpression) {
-            expectedExpression.argumentList.expressions[0].replace(expectedArgument)
+            expectedExpression.firstArg.replace(expectedArgument)
         }
-        expectedExpression.methodExpression.qualifierExpression!!.replace(oldExpectedExpression.methodExpression.qualifierExpression!!)
+        expectedExpression.replaceQualifierFromMethodCall(oldExpectedExpression)
         oldExpectedExpression.replace(expectedExpression)
     }
 }

src/main/java/de/platon42/intellij/plugins/cajon/quickfixes/SplitEqualsExpressionMethodCallQuickFix.kt

@@ -6,23 +6,28 @@ import com.intellij.psi.JavaPsiFacade
 import com.intellij.psi.PsiMethodCallExpression
 import com.intellij.psi.PsiStatement
 import com.intellij.psi.util.PsiTreeUtil
+import de.platon42.intellij.plugins.cajon.firstArg
+import de.platon42.intellij.plugins.cajon.qualifierExpression
+import de.platon42.intellij.plugins.cajon.replaceQualifierFromMethodCall
 
 class SplitEqualsExpressionMethodCallQuickFix(description: String, private val replacementMethod: String) : AbstractCommonQuickFix(description) {
 
     override fun applyFix(project: Project, descriptor: ProblemDescriptor) {
         val element = descriptor.startElement
-        val factory = JavaPsiFacade.getElementFactory(element.project)
         val methodCallExpression = element as? PsiMethodCallExpression ?: return
-        val equalsMethodCall = methodCallExpression.argumentList.expressions[0] as? PsiMethodCallExpression ?: return
-        val expectedArgument = equalsMethodCall.argumentList.expressions[0].copy()
-        equalsMethodCall.replace(equalsMethodCall.methodExpression.qualifierExpression!!)
+        val equalsMethodCall = methodCallExpression.firstArg as? PsiMethodCallExpression ?: return
+        val expectedArgument = equalsMethodCall.firstArg.copy()
+        equalsMethodCall.replace(equalsMethodCall.qualifierExpression)
 
         val statement = PsiTreeUtil.getParentOfType(element, PsiStatement::class.java) ?: return
         val oldExpectedExpression = PsiTreeUtil.findChildOfType(statement, PsiMethodCallExpression::class.java) ?: return
-        val expectedExpression =
-            factory.createExpressionFromText("a.${replacementMethod.replace("()", "(e)")}", element) as PsiMethodCallExpression
-        expectedExpression.argumentList.expressions[0].replace(expectedArgument)
-        expectedExpression.methodExpression.qualifierExpression!!.replace(oldExpectedExpression.methodExpression.qualifierExpression!!)
+
+        val factory = JavaPsiFacade.getElementFactory(element.project)
+        val expectedExpression = factory.createExpressionFromText(
+            "a.$replacementMethod(e)", element
+        ) as PsiMethodCallExpression
+        expectedExpression.firstArg.replace(expectedArgument)
+        expectedExpression.replaceQualifierFromMethodCall(oldExpectedExpression)
         oldExpectedExpression.replace(expectedExpression)
     }
 }

src/main/resources/META-INF/plugin.xml

@@ -10,7 +10,7 @@
     ]]></description>
 
     <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/build_number_ranges.html for description -->
-    <idea-version since-build="182.0"/>
+    <idea-version since-build="172.0"/>
 
     <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/plugin_compatibility.html
          on how to target different products -->
@@ -34,6 +34,11 @@
         <localInspection groupPath="Java" shortName="AssertThatBinaryExpressionIsTrueOrFalse" enabledByDefault="true" level="WARNING"
                          implementationClass="de.platon42.intellij.plugins.cajon.inspections.AssertThatBinaryExpressionIsTrueOrFalseInspection"/>
 
+        <localInspection groupPath="Java" shortName="AssertThatJava8Optional" enabledByDefault="true" level="WARNING"
+                         implementationClass="de.platon42.intellij.plugins.cajon.inspections.AssertThatJava8OptionalInspection"/>
+        <localInspection groupPath="Java" shortName="AssertThatGuavaOptional" enabledByDefault="true" level="WARNING"
+                         implementationClass="de.platon42.intellij.plugins.cajon.inspections.AssertThatGuavaOptionalInspection"/>
+
         <localInspection groupPath="Java" shortName="JUnitAssertToAssertJ" enabledByDefault="true" level="WARNING"
                          implementationClass="de.platon42.intellij.plugins.cajon.inspections.JUnitAssertToAssertJInspection"/>
     </extensions>

src/main/resources/inspectionDescriptions/AssertThatGuavaOptional.html

@@ -0,0 +1,8 @@
+<html>
+<body>
+Looks at expected and actual expression being of Guava Optional type and whether the statement effectively tries to assert the
+presence, absence or content and then replaces the statement by isPresent(), isAbsent(), or contains().
+<!-- tooltip end -->
+Requires AssertJ-Guava to be in classpath.
+</body>
+</html>

src/main/resources/inspectionDescriptions/AssertThatJava8Optional.html

@@ -0,0 +1,7 @@
+<html>
+<body>
+Looks at expected and actual expression being of Java 8 Optional type and whether the statement effectively tries to assert the
+presence, absence or content and then replaces the statement by isPresent(), isNotPresent(), contains(), or containsSame().
+<!-- tooltip end -->
+</body>
+</html>

src/test/java/de/platon42/intellij/playground/Playground.java

@@ -129,27 +129,61 @@ public class Playground {
     }
 
     private void java8Optional() {
-        Optional<String> foo = Optional.empty();
-        assertThat(foo.get()).isEqualTo("bla");
-        assertThat(foo).contains("bla");
-        assertThat(foo.isPresent()).isTrue();
-        assertThat(!foo.isPresent()).isFalse();
-        assertThat(foo).isPresent();
-        assertThat(foo.isPresent()).isFalse();
-        assertThat(!foo.isPresent()).isTrue();
-        assertThat(foo).isNotPresent();
+        Optional<String> opt = Optional.empty();
+
+        assertThat(opt.isPresent()).isEqualTo(true);
+        assertThat(opt.isPresent()).isEqualTo(Boolean.TRUE);
+        assertThat(opt.isPresent()).isNotEqualTo(false);
+        assertThat(opt.isPresent()).isNotEqualTo(Boolean.FALSE);
+        assertThat(opt.isPresent()).isTrue();
+
+        assertThat(opt.isPresent()).isEqualTo(false);
+        assertThat(opt.isPresent()).isEqualTo(Boolean.FALSE);
+        assertThat(opt.isPresent()).isNotEqualTo(true);
+        assertThat(opt.isPresent()).isNotEqualTo(Boolean.TRUE);
+        assertThat(opt.isPresent()).isFalse();
+
+        assertThat(opt.get()).isEqualTo("foo");
+        assertThat(opt.get()).isSameAs("foo");
+
+        assertThat(opt).isEqualTo(Optional.of("foo"));
+        assertThat(opt).isEqualTo(Optional.ofNullable("foo"));
+        assertThat(opt).isNotEqualTo(Optional.of("foo"));
+        assertThat(opt).isNotEqualTo(Optional.ofNullable("foo"));
+
+        assertThat(opt).isEqualTo(Optional.empty());
+        assertThat(opt).isNotEqualTo(Optional.empty());
+        assertThat(opt).isPresent();
     }
 
-    private void guavaOptional() {
-        com.google.common.base.Optional<String> foo = com.google.common.base.Optional.absent();
-        assertThat(foo.get()).isEqualTo("bla");
-        assertThat(foo).contains("bla");
-        assertThat(foo.isPresent()).isTrue();
-        assertThat(!foo.isPresent()).isFalse();
-        assertThat(foo).isPresent();
-        assertThat(foo.isPresent()).isFalse();
-        assertThat(!foo.isPresent()).isTrue();
-        assertThat(foo).isAbsent();
+    private void assertThatGuavaOptional() {
+        com.google.common.base.Optional<String> opt = com.google.common.base.Optional.absent();
+
+        assertThat(opt.isPresent()).isEqualTo(true);
+        assertThat(opt.isPresent()).isEqualTo(Boolean.TRUE);
+        assertThat(opt.isPresent()).isNotEqualTo(false);
+        assertThat(opt.isPresent()).isNotEqualTo(Boolean.FALSE);
+        assertThat(opt.isPresent()).isTrue();
+
+        assertThat(opt.isPresent()).isEqualTo(false);
+        assertThat(opt.isPresent()).isEqualTo(Boolean.FALSE);
+        assertThat(opt.isPresent()).isNotEqualTo(true);
+        assertThat(opt.isPresent()).isNotEqualTo(Boolean.TRUE);
+        assertThat(opt.isPresent()).isFalse();
+
+        assertThat(opt.get()).isEqualTo("foo");
+        assertThat(opt.get()).isSameAs("foo");
+        assertThat(opt.get()).isNotEqualTo("foo");
+        assertThat(opt.get()).isNotSameAs("foo");
+
+        assertThat(opt).isEqualTo(com.google.common.base.Optional.of("foo"));
+        assertThat(opt).isEqualTo(com.google.common.base.Optional.fromNullable("foo"));
+        assertThat(opt).isNotEqualTo(com.google.common.base.Optional.of("foo"));
+        assertThat(opt).isNotEqualTo(com.google.common.base.Optional.fromNullable("foo"));
+
+        assertThat(opt).isEqualTo(com.google.common.base.Optional.absent());
+        assertThat(opt).isNotEqualTo(com.google.common.base.Optional.absent());
+        assertThat(opt).isAbsent();
     }
 
     private void junitAssertions() {

src/test/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatBinaryExpressionIsTrueOrFalseInspectionTest.kt

@@ -14,7 +14,7 @@ internal class AssertThatBinaryExpressionIsTrueOrFalseInspectionTest : AbstractC
         runTest {
             myFixture.enableInspections(AssertThatBinaryExpressionIsTrueOrFalseInspection::class.java)
             myFixture.configureByFile("BinaryExpressionBefore.java")
-            executeQuickFixes(myFixture, Regex.fromLiteral("Split binary expression out of assertThat()"), 144)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Split binary expression out of assertThat()"), 148)
             executeQuickFixes(myFixture, Regex.fromLiteral("Split equals() expression out of assertThat()"), 12)
             myFixture.checkResultByFile("BinaryExpressionAfter.java")
         }

src/test/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatGuavaOptionalInspectionTest.kt

@@ -0,0 +1,30 @@
+package de.platon42.intellij.plugins.cajon.inspections
+
+import com.intellij.testFramework.fixtures.JavaCodeInsightTestFixture
+import de.platon42.intellij.jupiter.AddLocalJarToModule
+import de.platon42.intellij.jupiter.MyFixture
+import de.platon42.intellij.jupiter.TestDataSubPath
+import de.platon42.intellij.plugins.cajon.AbstractCajonTest
+import org.assertj.core.api.Assertions
+import org.junit.jupiter.api.Test
+
+@AddLocalJarToModule(com.google.common.base.Optional::class, org.assertj.guava.api.Assertions::class, Assertions::class)
+internal class AssertThatGuavaOptionalInspectionTest : AbstractCajonTest() {
+
+    @Test
+    @TestDataSubPath("inspections/AssertThatGuavaOptional")
+    internal fun assertThat_get_or_isPresent_for_Guava_Optional_can_be_simplified(@MyFixture myFixture: JavaCodeInsightTestFixture) {
+        runTest {
+            myFixture.enableInspections(AssertThatGuavaOptionalInspection::class.java)
+            myFixture.configureByFile("AssertThatGuavaOptionalBefore.java")
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isEqualTo() with isPresent()"), 2)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isNotEqualTo() with isPresent()"), 3)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isEqualTo() with isAbsent()"), 3)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isNotEqualTo() with isAbsent()"), 2)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isTrue() with isPresent()"), 1)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isFalse() with isAbsent()"), 1)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isEqualTo() with contains()"), 3)
+            myFixture.checkResultByFile("AssertThatGuavaOptionalAfter.java")
+        }
+    }
+}

src/test/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatJava8OptionalInspectionTest.kt

@@ -0,0 +1,28 @@
+package de.platon42.intellij.plugins.cajon.inspections
+
+import com.intellij.testFramework.fixtures.JavaCodeInsightTestFixture
+import de.platon42.intellij.jupiter.MyFixture
+import de.platon42.intellij.jupiter.TestDataSubPath
+import de.platon42.intellij.plugins.cajon.AbstractCajonTest
+import org.junit.jupiter.api.Test
+
+internal class AssertThatJava8OptionalInspectionTest : AbstractCajonTest() {
+
+    @Test
+    @TestDataSubPath("inspections/AssertThatJava8Optional")
+    internal fun assertThat_get_or_isPresent_for_Java8_Optional_can_be_simplified(@MyFixture myFixture: JavaCodeInsightTestFixture) {
+        runTest {
+            myFixture.enableInspections(AssertThatJava8OptionalInspection::class.java)
+            myFixture.configureByFile("AssertThatJava8OptionalBefore.java")
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isEqualTo() with isPresent()"), 2)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isNotEqualTo() with isPresent()"), 3)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isEqualTo() with isNotPresent()"), 3)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isNotEqualTo() with isNotPresent()"), 2)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isTrue() with isPresent()"), 1)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isFalse() with isNotPresent()"), 1)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isEqualTo() with contains()"), 3)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isSameAs() with containsSame()"), 1)
+            myFixture.checkResultByFile("AssertThatJava8OptionalAfter.java")
+        }
+    }
+}

src/test/resources/inspections/AssertThatGuavaOptional/AssertThatGuavaOptionalAfter.java

@@ -0,0 +1,36 @@
+import com.google.common.base.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.guava.api.Assertions.assertThat;
+
+public class AssertThatGuavaOptional {
+
+    private void assertThatGuavaOptional() {
+        Optional<String> opt = Optional.absent();
+
+        assertThat(opt).isPresent();
+        assertThat(opt).isPresent();
+        assertThat(opt).isPresent();
+        assertThat(opt).isPresent();
+        assertThat(opt).isPresent();
+
+        assertThat(opt).isAbsent();
+        assertThat(opt).isAbsent();
+        assertThat(opt).isAbsent();
+        assertThat(opt).isAbsent();
+        assertThat(opt).isAbsent();
+
+        assertThat(opt).contains("foo");
+        assertThat(opt.get()).isSameAs("foo");
+        assertThat(opt.get()).isNotEqualTo("foo");
+        assertThat(opt.get()).isNotSameAs("foo");
+
+        assertThat(opt).contains("foo");
+        assertThat(opt).contains("foo");
+        assertThat(opt).isNotEqualTo(Optional.of("foo"));
+        assertThat(opt).isNotEqualTo(Optional.fromNullable("foo"));
+
+        assertThat(opt).isAbsent();
+        assertThat(opt).isPresent();
+    }
+}

src/test/resources/inspections/AssertThatGuavaOptional/AssertThatGuavaOptionalBefore.java

@@ -0,0 +1,36 @@
+import com.google.common.base.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.guava.api.Assertions.assertThat;
+
+public class AssertThatGuavaOptional {
+
+    private void assertThatGuavaOptional() {
+        Optional<String> opt = Optional.absent();
+
+        assertThat(opt.isPresent()).isEqualTo(true);
+        assertThat(opt.isPresent()).isEqualTo(Boolean.TRUE);
+        assertThat(opt.isPresent()).isNotEqualTo(false);
+        assertThat(opt.isPresent()).isNotEqualTo(Boolean.FALSE);
+        assertThat(opt.isPresent()).isTrue();
+
+        assertThat(opt.isPresent()).isEqualTo(false);
+        assertThat(opt.isPresent()).isEqualTo(Boolean.FALSE);
+        assertThat(opt.isPresent()).isNotEqualTo(true);
+        assertThat(opt.isPresent()).isNotEqualTo(Boolean.TRUE);
+        assertThat(opt.isPresent()).isFalse();
+
+        assertThat(opt.get()).isEqualTo("foo");
+        assertThat(opt.get()).isSameAs("foo");
+        assertThat(opt.get()).isNotEqualTo("foo");
+        assertThat(opt.get()).isNotSameAs("foo");
+
+        assertThat(opt).isEqualTo(Optional.of("foo"));
+        assertThat(opt).isEqualTo(Optional.fromNullable("foo"));
+        assertThat(opt).isNotEqualTo(Optional.of("foo"));
+        assertThat(opt).isNotEqualTo(Optional.fromNullable("foo"));
+
+        assertThat(opt).isEqualTo(Optional.absent());
+        assertThat(opt).isNotEqualTo(Optional.absent());
+    }
+}

src/test/resources/inspections/AssertThatJava8Optional/AssertThatJava8OptionalAfter.java

@@ -0,0 +1,35 @@
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class AssertThatJava8Optional {
+
+    private void assertThatJava8Optional() {
+        Optional<String> opt = Optional.empty();
+
+        assertThat(opt).isPresent();
+        assertThat(opt).isPresent();
+        assertThat(opt).isPresent();
+        assertThat(opt).isPresent();
+        assertThat(opt).isPresent();
+
+        assertThat(opt).isNotPresent();
+        assertThat(opt).isNotPresent();
+        assertThat(opt).isNotPresent();
+        assertThat(opt).isNotPresent();
+        assertThat(opt).isNotPresent();
+
+        assertThat(opt).contains("foo");
+        assertThat(opt).containsSame("foo");
+        assertThat(opt.get()).isNotEqualTo("foo");
+        assertThat(opt.get()).isNotSameAs("foo");
+
+        assertThat(opt).contains("foo");
+        assertThat(opt).contains("foo");
+        assertThat(opt).isNotEqualTo(Optional.of("foo"));
+        assertThat(opt).isNotEqualTo(Optional.ofNullable("foo"));
+
+        assertThat(opt).isNotPresent();
+        assertThat(opt).isPresent();
+    }
+}

src/test/resources/inspections/AssertThatJava8Optional/AssertThatJava8OptionalBefore.java

@@ -0,0 +1,35 @@
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class AssertThatJava8Optional {
+
+    private void assertThatJava8Optional() {
+        Optional<String> opt = Optional.empty();
+
+        assertThat(opt.isPresent()).isEqualTo(true);
+        assertThat(opt.isPresent()).isEqualTo(Boolean.TRUE);
+        assertThat(opt.isPresent()).isNotEqualTo(false);
+        assertThat(opt.isPresent()).isNotEqualTo(Boolean.FALSE);
+        assertThat(opt.isPresent()).isTrue();
+
+        assertThat(opt.isPresent()).isEqualTo(false);
+        assertThat(opt.isPresent()).isEqualTo(Boolean.FALSE);
+        assertThat(opt.isPresent()).isNotEqualTo(true);
+        assertThat(opt.isPresent()).isNotEqualTo(Boolean.TRUE);
+        assertThat(opt.isPresent()).isFalse();
+
+        assertThat(opt.get()).isEqualTo("foo");
+        assertThat(opt.get()).isSameAs("foo");
+        assertThat(opt.get()).isNotEqualTo("foo");
+        assertThat(opt.get()).isNotSameAs("foo");
+
+        assertThat(opt).isEqualTo(Optional.of("foo"));
+        assertThat(opt).isEqualTo(Optional.ofNullable("foo"));
+        assertThat(opt).isNotEqualTo(Optional.of("foo"));
+        assertThat(opt).isNotEqualTo(Optional.ofNullable("foo"));
+
+        assertThat(opt).isEqualTo(Optional.empty());
+        assertThat(opt).isNotEqualTo(Optional.empty());
+    }
+}

src/test/resources/inspections/BinaryExpression/BinaryExpressionAfter.java

@@ -10,6 +10,8 @@ public class BinaryExpression {
         String stringExp = "foo";
         String stringAct = "bar";
 
+        assertThat(primAct).isEqualTo(primExp);
+        assertThat(primAct).isEqualTo(primExp);
         assertThat(primAct).isEqualTo(primExp);
         assertThat(primAct).isEqualTo(primExp);
         assertThat(primAct).isEqualTo(primExp);
@@ -18,6 +20,8 @@ public class BinaryExpression {
         assertThat(primAct).isNotEqualTo(primExp);
         assertThat(primAct).isNotEqualTo(primExp);
         assertThat(primAct).isNotEqualTo(primExp);
+        assertThat(primAct).isNotEqualTo(primExp);
+        assertThat(primAct).isNotEqualTo(primExp);
         assertThat(primAct).isNotEqualTo(1);
         assertThat(primAct).isNotEqualTo(1);
 

src/test/resources/inspections/BinaryExpression/BinaryExpressionBefore.java

@@ -12,12 +12,16 @@ public class BinaryExpression {
 
         assertThat(primAct == primExp).isTrue();
         assertThat(primAct == primExp).isEqualTo(true);
+        assertThat(primAct == primExp).isEqualTo(Boolean.TRUE);
         assertThat(primAct == primExp).isNotEqualTo(false);
+        assertThat(primAct == primExp).isNotEqualTo(Boolean.FALSE);
         assertThat(primAct == 1).isTrue();
         assertThat(1 == primAct).isTrue();
         assertThat(primAct == primExp).isFalse();
         assertThat(primAct == primExp).isEqualTo(false);
+        assertThat(primAct == primExp).isEqualTo(Boolean.FALSE);
         assertThat(primAct == primExp).isNotEqualTo(true);
+        assertThat(primAct == primExp).isNotEqualTo(Boolean.TRUE);
         assertThat(primAct == 1).isFalse();
         assertThat(1 == primAct).isFalse();