code: public static <T> void assertNotEquals (@Nullable final T x, @Nullable final T y)
    {
      assertNotEquals ((String) null, x, y);
    }
docs: Like JUnit assertNotEquals but using {@link EqualsHelper}.
  
  @param x
  Fist object. May be <code>null</code>
  @param y
  Second object. May be <code>null</code>.