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package tools_test
import (
"bytes"
"io"
"testing"
"github.com/git-lfs/git-lfs/v3/errors"
"github.com/git-lfs/git-lfs/v3/tools"
"github.com/stretchr/testify/assert"
)
func TestRetriableReaderReturnsSuccessfulReads(t *testing.T) {
r := tools.NewRetriableReader(bytes.NewBuffer([]byte{0x1, 0x2, 0x3, 0x4}))
var buf [4]byte
n, err := r.Read(buf[:])
assert.Nil(t, err)
assert.Equal(t, 4, n)
assert.Equal(t, []byte{0x1, 0x2, 0x3, 0x4}, buf[:])
}
func TestRetriableReaderReturnsEOFs(t *testing.T) {
r := tools.NewRetriableReader(bytes.NewBuffer([]byte{ /* empty */ }))
var buf [1]byte
n, err := r.Read(buf[:])
assert.Equal(t, io.EOF, err)
assert.Equal(t, 0, n)
}
func TestRetriableReaderMakesErrorsRetriable(t *testing.T) {
expected := errors.New("example error")
r := tools.NewRetriableReader(&ErrReader{expected})
var buf [1]byte
n, err := r.Read(buf[:])
assert.Equal(t, 0, n)
assert.EqualError(t, err, "LFS: "+expected.Error())
assert.True(t, errors.IsRetriableError(err))
}
func TestRetriableReaderDoesNotRewrap(t *testing.T) {
// expected is already "retriable", as would be the case if the
// underlying reader was a *RetriableReader itself.
expected := errors.NewRetriableError(errors.New("example error"))
r := tools.NewRetriableReader(&ErrReader{expected})
var buf [1]byte
n, err := r.Read(buf[:])
assert.Equal(t, 0, n)
// errors.NewRetriableError wraps the given error with the prefix
// message "LFS", so these two errors should be equal, indicating that
// the RetriableReader did not re-wrap the error it received.
assert.EqualError(t, err, expected.Error())
assert.True(t, errors.IsRetriableError(err))
}
// ErrReader implements io.Reader and only returns errors.
type ErrReader struct {
// err is the error that this reader will return.
err error
}
// Read implements io.Reader#Read, and returns (0, e.err).
func (e *ErrReader) Read(p []byte) (n int, err error) {
return 0, e.err
}
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