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PMD is a tool that looks for potential problems like possible bugs, dead code, suboptimal code, overcomplicated expressions or duplicate code.

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This rule detects JUnit assertions in object references equality. These assertions should be made by more specific methods, like assertSame, assertNotSame.
public class FooTest extends TestCase {
  void testCode() {
    Object a, b;

    assertTrue(a==b); // violation
    assertSame(a, b); // good usage
  }
}