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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package util
import (
"bytes"
"errors"
"testing"
"github.com/stretchr/testify/assert"
)
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)
assert.NoError(t, err)
assert.Equal(t, []byte("01"), buf)
buf, err = readWithLimit(bytes.NewBuffer(bs), 5, 5)
assert.NoError(t, err)
assert.Equal(t, []byte("01234"), buf)
buf, err = readWithLimit(bytes.NewBuffer(bs), 5, 6)
assert.NoError(t, err)
assert.Equal(t, []byte("012345"), buf)
buf, err = readWithLimit(bytes.NewBuffer(bs), 5, len(bs))
assert.NoError(t, err)
assert.Equal(t, []byte("0123456789abcdef"), buf)
buf, err = readWithLimit(bytes.NewBuffer(bs), 5, 100)
assert.NoError(t, err)
assert.Equal(t, []byte("0123456789abcdef"), buf)
// test with error
buf, err = readWithLimit(&readerWithError{bytes.NewBuffer(bs)}, 5, 10)
assert.NoError(t, err)
assert.Equal(t, []byte("0123456789"), buf)
buf, err = readWithLimit(&readerWithError{bytes.NewBuffer(bs)}, 5, 100)
assert.ErrorContains(t, err, "test error")
assert.Empty(t, buf)
// test public function
buf, err = ReadWithLimit(bytes.NewBuffer(bs), 2)
assert.NoError(t, err)
assert.Equal(t, []byte("01"), buf)
buf, err = ReadWithLimit(bytes.NewBuffer(bs), 9999999)
assert.NoError(t, err)
assert.Equal(t, []byte("0123456789abcdef"), buf)
}
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