code: @SuppressWarnings({"SameParameterValue", "WeakerAccess"})
      public static void assertNotIdentity(String message, Object expected, Object actual) {
          if (expected == actual) {
              fail(message);
          }
      }
docs: Asserts that two objects don't have the same identity, i.e. {@code expected != actual}, and fails otherwise.
  
  @param message  The message of the thrown {@link java.lang.AssertionError}.
  @param expected The expected object.
  @param actual   The actual object.