t.Run(test.v, func(t *testing.T) {
			if out := CheckTruth(test.v); out != test.out {
				t.Errorf("CheckTruth(%s) want: %t, got: %t", test.v, test.out, out)
			}
		})
	}
}

func TestToStringKey(t *testing.T) {
	cases := []struct {
		values []interface{}
		key    string
	}{
		{[]interface{}{"a"}, "a"},
		{[]interface{}{1, 2, 3}, "1_2_3"},
		{[]interface{}{1, nil, 3}, "1_nil_3"},