// Copyright 2018 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cascades

import (
	"testing"

	"github.com/pingcap/tidb/expression"
	"github.com/pingcap/tidb/planner/memo"
	"github.com/pingcap/tidb/planner/property"
	"github.com/stretchr/testify/require"
)

func TestGetEnforcerRules(t *testing.T) {
	prop := &property.PhysicalProperty{}
	group := memo.NewGroupWithSchema(nil, expression.NewSchema())
	enforcers := GetEnforcerRules(group, prop)
	require.Nil(t, enforcers)

	col := &expression.Column{}
	prop.SortItems = append(prop.SortItems, property.SortItem{Col: col})
	enforcers = GetEnforcerRules(group, prop)
	require.NotNil(t, enforcers)
	require.Len(t, enforcers, 1)

	_, ok := enforcers[0].(*OrderEnforcer)
	require.True(t, ok)
}

func TestNewProperties(t *testing.T) {
	prop := &property.PhysicalProperty{}
	col := &expression.Column{}
	group := memo.NewGroupWithSchema(nil, expression.NewSchema())
	prop.SortItems = append(prop.SortItems, property.SortItem{Col: col})
	enforcers := GetEnforcerRules(group, prop)
	orderEnforcer, _ := enforcers[0].(*OrderEnforcer)
	newProp := orderEnforcer.NewProperty(prop)
	require.Nil(t, newProp.SortItems)
}