Merged AssertThatObjectIsNull and AssertThatObjectIsNotNull to AssertThatObjectIsNullOrNotNull.

Extended tests to be more explicit regarding the expected quick fix messages.

src/test/resources/inspections/ObjectIsNotNull/ObjectIsNotNullAfter.java

@@ -1,10 +0,0 @@
-import static org.assertj.core.api.Assertions.assertThat;
-
-public class ObjectIsNotNull {
-
-    private void objectIsNotNull() {
-        assertThat("").isNotNull();
-        assertThat("").as("nah").isNotNull();
-        assertThat(new Object).isNotNull();
-    }
-}

src/test/resources/inspections/ObjectIsNotNull/ObjectIsNotNullBefore.java

@@ -1,10 +0,0 @@
-import static org.assertj.core.api.Assertions.assertThat;
-
-public class ObjectIsNotNull {
-
-    private void objectIsNotNull() {
-        assertThat("").isNotEqualTo(null);
-        assertThat("").as("nah").isNotEqualTo(null);
-        assertThat(new Object).isNotEqualTo(null);
-    }
-}

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

@@ -5,6 +5,10 @@ public class ObjectIsNull {
     private void objectIsNull() {
         assertThat("").isNull();
         assertThat("").as("nah").isNull();
-        assertThat(new Object).isNull();
+        assertThat(new Object()).isNull();
+
+        assertThat("").isNotNull();
+        assertThat("").as("nah").isNotNull();
+        assertThat(new Object()).isNotNull();
     }
 }

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

@@ -5,6 +5,10 @@ public class ObjectIsNull {
     private void objectIsNull() {
         assertThat("").isEqualTo(null);
         assertThat("").as("nah").isEqualTo(null);
-        assertThat(new Object).isEqualTo(null);
+        assertThat(new Object()).isEqualTo(null);
+
+        assertThat("").isNotEqualTo(null);
+        assertThat("").as("nah").isNotEqualTo(null);
+        assertThat(new Object()).isNotEqualTo(null);
     }
 }