code: func (a *Assertions) NotSubset(list interface{}, subset interface{}, msgAndArgs ...interface{}) {
  	if h, ok := a.t.(tHelper); ok {
  		h.Helper()
  	}
  	NotSubset(a.t, list, subset, msgAndArgs...)
  }
docs: // NotSubset asserts that the specified list(array, slice...) contains not all
  // elements given in the specified subset(array, slice...).
  //
  //    a.NotSubset([1, 3, 4], [1, 2], "But [1, 3, 4] does not contain [1, 2]")