Fixed isEmpty() for enumerables and strings and isNull() for object conversions to be applied only if it is the terminal method call as isEmpty() and isNull() return void.

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 com.intellij.psi.PsiStatement
 import de.platon42.intellij.plugins.cajon.MethodNames
 
 class AssertThatEnumerableIsEmptyInspection : AbstractAssertJInspection() {
@@ -18,7 +19,8 @@ class AssertThatEnumerableIsEmptyInspection : AbstractAssertJInspection() {
         return object : JavaElementVisitor() {
             override fun visitMethodCallExpression(expression: PsiMethodCallExpression) {
                 super.visitMethodCallExpression(expression)
-                if (!HAS_SIZE.test(expression)) {
+                val isLastExpression = expression.parent is PsiStatement
+                if (!(HAS_SIZE.test(expression) && isLastExpression)) {
                     return
                 }
 

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

@@ -1,10 +1,7 @@
 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.PsiType
+import com.intellij.psi.*
 import de.platon42.intellij.plugins.cajon.MethodNames
 import de.platon42.intellij.plugins.cajon.firstArg
 import de.platon42.intellij.plugins.cajon.map
@@ -23,7 +20,8 @@ class AssertThatObjectIsNullOrNotNullInspection : AbstractAssertJInspection() {
                 super.visitMethodCallExpression(expression)
                 val isNotEqualTo = IS_NOT_EQUAL_TO_OBJECT.test(expression)
                 val isEqualTo = IS_EQUAL_TO_OBJECT.test(expression)
-                if (!(isEqualTo || isNotEqualTo)) {
+                val isLastExpression = expression.parent is PsiStatement
+                if (!((isEqualTo && isLastExpression) || isNotEqualTo)) {
                     return
                 }
 

src/main/java/de/platon42/intellij/plugins/cajon/inspections/AssertThatStringIsEmptyInspection.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 com.intellij.psi.PsiStatement
 import de.platon42.intellij.plugins.cajon.AssertJClassNames.Companion.ABSTRACT_CHAR_SEQUENCE_ASSERT_CLASSNAME
 import de.platon42.intellij.plugins.cajon.MethodNames
 
@@ -21,7 +22,8 @@ class AssertThatStringIsEmptyInspection : AbstractAssertJInspection() {
                 super.visitMethodCallExpression(expression)
                 val isEqual = IS_EQUAL_TO_OBJECT.test(expression)
                 val hasSize = HAS_SIZE.test(expression)
-                if (!(isEqual || hasSize)) {
+                val isLastExpression = expression.parent is PsiStatement
+                if (!((isEqual || hasSize) && isLastExpression)) {
                     return
                 }
 

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

@@ -14,7 +14,7 @@ internal class AssertThatEnumerableIsEmptyInspectionTest : AbstractCajonTest() {
         runTest {
             myFixture.enableInspections(AssertThatEnumerableIsEmptyInspection::class.java)
             myFixture.configureByFile("EnumerableIsEmptyBefore.java")
-            executeQuickFixes(myFixture, Regex.fromLiteral("Replace hasSize() with isEmpty()"), 4)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace hasSize() with isEmpty()"), 5)
             myFixture.checkResultByFile("EnumerableIsEmptyAfter.java")
         }
     }

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

@@ -15,7 +15,7 @@ internal class AssertThatObjectIsNullOrNotNullInspectionTest : AbstractCajonTest
             myFixture.enableInspections(AssertThatObjectIsNullOrNotNullInspection::class.java)
             myFixture.configureByFile("ObjectIsNullOrNotNullBefore.java")
             executeQuickFixes(myFixture, Regex.fromLiteral("Replace isEqualTo() with isNull()"), 4)
-            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isNotEqualTo() with isNotNull()"), 4)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isNotEqualTo() with isNotNull()"), 5)
             myFixture.checkResultByFile("ObjectIsNullOrNotNullAfter.java")
         }
     }

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

@@ -14,8 +14,8 @@ internal class AssertThatStringIsEmptyInspectionTest : AbstractCajonTest() {
         runTest {
             myFixture.enableInspections(AssertThatStringIsEmptyInspection::class.java)
             myFixture.configureByFile("StringIsEmptyBefore.java")
-            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isEqualTo() with isEmpty()"), 2)
-            executeQuickFixes(myFixture, Regex.fromLiteral("Replace hasSize() with isEmpty()"), 2)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace isEqualTo() with isEmpty()"), 3)
+            executeQuickFixes(myFixture, Regex.fromLiteral("Replace hasSize() with isEmpty()"), 3)
             myFixture.checkResultByFile("StringIsEmptyAfter.java")
         }
     }

src/test/resources/inspections/EnumerableIsEmpty/EnumerableIsEmptyAfter.java

@@ -14,5 +14,7 @@ public class EnumerableIsEmpty {
         assertThat(new StringBuilder()).as("bar").hasSize(1);
         assertThat(new ArrayList<Long>()).as("etc").hasSize(1);
         assertThat(new Long[1]).as("etc").hasSize(1);
+
+        assertThat("string").as("foo").hasSize(0).hasSameSizeAs("foo").isEmpty();
     }
 }

src/test/resources/inspections/EnumerableIsEmpty/EnumerableIsEmptyBefore.java

@@ -14,5 +14,7 @@ public class EnumerableIsEmpty {
         assertThat(new StringBuilder()).as("bar").hasSize(1);
         assertThat(new ArrayList<Long>()).as("etc").hasSize(1);
         assertThat(new Long[1]).as("etc").hasSize(1);
+
+        assertThat("string").as("foo").hasSize(0).hasSameSizeAs("foo").hasSize(0);
     }
 }

src/test/resources/inspections/ObjectIsNullOrNotNull/ObjectIsNullOrNotNullAfter.java

@@ -12,5 +12,6 @@ public class ObjectIsNull {
         assertThat(new Object()).isNotNull();
 
         assertThat(new Object()).as("foo").isNotNull().as("bar").isEqualTo(new Object()).as("etc").isNull();
+        assertThat(new Object()).as("foo").isEqualTo(null).as("bar").isEqualTo(new Object()).as("etc").isNotNull();
     }
 }

src/test/resources/inspections/ObjectIsNullOrNotNull/ObjectIsNullOrNotNullBefore.java

@@ -12,5 +12,6 @@ public class ObjectIsNull {
         assertThat(new Object()).isNotEqualTo(null);
 
         assertThat(new Object()).as("foo").isNotEqualTo(null).as("bar").isEqualTo(new Object()).as("etc").isEqualTo(null);
+        assertThat(new Object()).as("foo").isEqualTo(null).as("bar").isEqualTo(new Object()).as("etc").isNotEqualTo(null);
     }
 }

src/test/resources/inspections/StringIsEmpty/StringIsEmptyAfter.java

@@ -15,5 +15,8 @@ public class StringIsEmpty {
         assertThat(stringBuilder).as("bar").isEmpty();
 
         assertThat(new Object()).isEqualTo("");
+
+        assertThat(string).as("foo").isEqualTo("").as("bar").hasSize(0).hasSameSizeAs("foo").isEmpty();
+        assertThat(string).as("foo").isEqualTo("").as("bar").hasSize(0).hasSameSizeAs("foo").isEmpty();
     }
 }

src/test/resources/inspections/StringIsEmpty/StringIsEmptyBefore.java

@@ -15,5 +15,8 @@ public class StringIsEmpty {
         assertThat(stringBuilder).as("bar").hasSize(0);
 
         assertThat(new Object()).isEqualTo("");
+
+        assertThat(string).as("foo").isEqualTo("").as("bar").hasSize(0).hasSameSizeAs("foo").isEqualTo("");
+        assertThat(string).as("foo").isEqualTo("").as("bar").hasSize(0).hasSameSizeAs("foo").hasSize(0);
     }
 }