code: public static void assertNotEquals(String message, double unexpected,
              double actual, double delta) {
          if (!doubleIsDifferent(unexpected, actual, delta)) {
              failEquals(message, Double.valueOf(actual));
          }
      }
docs: Asserts that two doubles are <b>not</b> equal to within a positive delta.
  If they are, an {@link AssertionError} is thrown with the given
  message. If the unexpected value is infinity then the delta value is
  ignored. NaNs are considered equal:
  <code>assertNotEquals(Double.NaN, Double.NaN, *)</code> fails
  
  @param message the identifying message for the {@link AssertionError} (<code>null</code>
  okay)
  @param unexpected unexpected value
  @param actual the value to check against <code>unexpected</code>
  @param delta the maximum delta between <code>unexpected</code> and
  <code>actual</code> for which both numbers are still
  considered equal.