code: func NotEqualf(t TestingT, expected interface{}, actual interface{}, msg string, args ...interface{}) bool {
  	if h, ok := t.(tHelper); ok {
  		h.Helper()
  	}
  	return NotEqual(t, expected, actual, append([]interface{}{msg}, args...)...)
  }
docs: // NotEqualf asserts that the specified values are NOT equal.
  //
  //    assert.NotEqualf(t, obj1, obj2, "error message %s", "formatted")
  //
  // Pointer variable equality is determined based on the equality of the
  // referenced values (as opposed to the memory addresses).