_, err := p.parseOperator()
		if ok := reflect.DeepEqual(testcase.expectedError, err); !ok {
			t.Errorf("\nexpect err [%v], \nactual err [%v]", testcase.expectedError, err)
		}
	}
}

func TestRequirementConstructor(t *testing.T) {
	requirementConstructorTests := []struct {
		Key     string
		Op      selection.Operator
		Vals    sets.String
		WantErr field.ErrorList
	}{
		{
			Key: "x1",