code: func Subsetf(t TestingT, list interface{}, subset interface{}, msg string, args ...interface{}) {
  	if h, ok := t.(tHelper); ok {
  		h.Helper()
  	}
  	if assert.Subsetf(t, list, subset, msg, args...) {
  		return
  	}
  	t.FailNow()
  }
docs: // Subsetf asserts that the specified list(array, slice...) contains all
  // elements given in the specified subset(array, slice...).
  //
  //    assert.Subsetf(t, [1, 2, 3], [1, 2], "But [1, 2, 3] does contain [1, 2]", "error message %s", "formatted")