/*
 * Copyright 2024 CloudWeGo Authors
 *
 * 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 netpoll

import (
	"bytes"
	"testing"

	"github.com/stretchr/testify/require"
)

func TestNetpollDirectWriter(t *testing.T) {
	w := &NetpollDirectWriter{}

	i := 0
	b := w.Malloc(100)
	vv := [][]byte{ // 10 x 10
		[]byte("1234567890"),
		[]byte("2234567890"),
		[]byte("3234567890"),
		[]byte("4234567890"),
		[]byte("5234567890"),
		[]byte("6234567890"),
		[]byte("7234567890"),
		[]byte("8234567890"),
		[]byte("9234567890"),
		[]byte("0234567890"),
	}

	for j, v := range vv {
		if j != 0 && j%2 == 0 {
			_ = w.WriteDirect(v, len(b)-i)
		} else {
			i += copy(b[i:], v)
		}
	}
	expect := bytes.Join(vv, []byte{})
	require.Equal(t, expect, w.Bytes())
}
