// Copyright 2023 The Gitea Authors. All rights reserved.// SPDX-License-Identifier: MIT package util import (	"bytes"	"errors"	"testing" 	"github.com/stretchr/testify/assert"	"github.com/stretchr/testify/require") type readerWithError struct {	buf *bytes.Buffer} func (r *readerWithError) Read(p []byte) (n int, err error) {	if r.buf.Len() < 2 {		return 0, errors.New("test error")	}	return r.buf.Read(p)} func TestReadWithLimit(t *testing.T) {	bs := []byte("0123456789abcdef") 	// normal test	buf, err := readWithLimit(bytes.NewBuffer(bs), 5, 2)	require.NoError(t, err)	assert.Equal(t, []byte("01"), buf) 	buf, err = readWithLimit(bytes.NewBuffer(bs), 5, 5)	require.NoError(t, err)	assert.Equal(t, []byte("01234"), buf) 	buf, err = readWithLimit(bytes.NewBuffer(bs), 5, 6)	require.NoError(t, err)	assert.Equal(t, []byte("012345"), buf) 	buf, err = readWithLimit(bytes.NewBuffer(bs), 5, len(bs))	require.NoError(t, err)	assert.Equal(t, []byte("0123456789abcdef"), buf) 	buf, err = readWithLimit(bytes.NewBuffer(bs), 5, 100)	require.NoError(t, err)	assert.Equal(t, []byte("0123456789abcdef"), buf) 	// test with error	buf, err = readWithLimit(&readerWithError{bytes.NewBuffer(bs)}, 5, 10)	require.NoError(t, err)	assert.Equal(t, []byte("0123456789"), buf) 	buf, err = readWithLimit(&readerWithError{bytes.NewBuffer(bs)}, 5, 100)	require.ErrorContains(t, err, "test error")	assert.Empty(t, buf) 	// test public function	buf, err = ReadWithLimit(bytes.NewBuffer(bs), 2)	require.NoError(t, err)	assert.Equal(t, []byte("01"), buf) 	buf, err = ReadWithLimit(bytes.NewBuffer(bs), 9999999)	require.NoError(t, err)	assert.Equal(t, []byte("0123456789abcdef"), buf)}