code: public static void assertNotEquals(String message, Object unexpected,
              Object actual) {
          if (equalsRegardingNull(unexpected, actual)) {
              failEquals(message, actual);
          }
      }
docs: Asserts that two objects are <b>not</b> equals. If they are, an
  {@link AssertionError} is thrown with the given message. If
  <code>unexpected</code> and <code>actual</code> are <code>null</code>,
  they are considered equal.
  
  @param message the identifying message for the {@link AssertionError} (<code>null</code>
  okay)
  @param unexpected unexpected value to check
  @param actual the value to check against <code>unexpected</code>