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|
package blobcache
import (
"bytes"
"io"
"testing"
"github.com/containers/image/v5/internal/private"
"github.com/stretchr/testify/assert"
)
func readNextStream(streams chan io.ReadCloser, errs chan error) ([]byte, error) {
select {
case r := <-streams:
if r == nil {
return nil, nil
}
defer r.Close()
return io.ReadAll(r)
case err := <-errs:
return nil, err
}
}
// readSeekerNopCloser adds a no-op Close() method to a readSeeker
type readSeekerNopCloser struct {
io.ReadSeeker
}
func (c *readSeekerNopCloser) Close() error {
return nil
}
func TestStreamChunksFromFile(t *testing.T) {
file := &readSeekerNopCloser{bytes.NewReader([]byte("123456789"))}
streams := make(chan io.ReadCloser)
errs := make(chan error)
chunks := []private.ImageSourceChunk{
{Offset: 1, Length: 2},
{Offset: 4, Length: 1},
}
go streamChunksFromFile(streams, errs, file, chunks)
for _, c := range []struct {
expectedData []byte
expectedError error
}{
{[]byte("23"), nil},
{[]byte("5"), nil},
{[]byte(nil), nil},
} {
data, err := readNextStream(streams, errs)
assert.Equal(t, c.expectedData, data)
assert.Equal(t, c.expectedError, err)
}
}
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