code: @SuppressWarnings("WeakerAccess")
      public static void assertIdentity(String message, Object expected, Object actual) {
          if (expected != actual) {
              fail(message);
          }
      }
docs: Asserts that two objects 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.