AssertJIsNull

SUGGESTION

Simplification

View source code on GitHub

Summary

Prefer .isNull() over .isEqualTo(null)

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("AssertJIsNull") to the enclosing element.

Disable this pattern completely by adding -Xep:AssertJIsNull:OFF as compiler argument. Learn more.

Samples

Replacement

Shows the difference in example code before and after the bug pattern is applied.

 import static org.assertj.core.api.Assertions.assertThat;
 
 class A {
   void m() {
-    assertThat(1).isEqualTo(null);
-    assertThat("foo").isEqualTo(null);
+    assertThat(1).isNull();
+    assertThat("foo").isNull();
   }
 }

Identification

Shows code lines which will (not) be flagged by this bug pattern.
A //BUG: Diagnostic contains: comment is placed above any violating line.

import static org.assertj.core.api.Assertions.assertThat;

class A {
  void m() {
    assertThat(1).isEqualTo(1);
    // BUG: Diagnostic contains:
    assertThat(1).isEqualTo(null);
    // BUG: Diagnostic contains:
    assertThat("foo").isEqualTo(null);
    isEqualTo(null);
  }

  private boolean isEqualTo(Object value) {
    return value.equals("bar");
  }
}