// Copyright 2022 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 ddl

import (
	"bytes"
	"testing"

	"github.com/pingcap/tidb/kv"
	"github.com/stretchr/testify/require"
)

func TestDoneTaskKeeper(t *testing.T) {
	n := newDoneTaskKeeper(kv.Key("a"))
	n.updateNextKey(0, kv.Key("b"))
	n.updateNextKey(1, kv.Key("c"))
	require.True(t, bytes.Equal(n.nextKey, kv.Key("c")))
	require.Len(t, n.doneTaskNextKey, 0)

	n.updateNextKey(4, kv.Key("f"))
	require.True(t, bytes.Equal(n.nextKey, kv.Key("c")))
	require.Len(t, n.doneTaskNextKey, 1)
	n.updateNextKey(3, kv.Key("e"))
	n.updateNextKey(5, kv.Key("g"))
	require.True(t, bytes.Equal(n.nextKey, kv.Key("c")))
	require.Len(t, n.doneTaskNextKey, 3)
	n.updateNextKey(2, kv.Key("d"))
	require.True(t, bytes.Equal(n.nextKey, kv.Key("g")))
	require.Len(t, n.doneTaskNextKey, 0)

	n.updateNextKey(6, kv.Key("h"))
	require.True(t, bytes.Equal(n.nextKey, kv.Key("h")))
}