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package pack
import (
"bytes"
"fmt"
"testing"
"github.com/stretchr/testify/assert"
)
func TestOffsetReaderAtReadsAtOffset(t *testing.T) {
bo := &OffsetReaderAt{
r: bytes.NewReader([]byte{0x0, 0x1, 0x2, 0x3}),
o: 1,
}
var x1 [1]byte
n1, e1 := bo.Read(x1[:])
assert.NoError(t, e1)
assert.Equal(t, 1, n1)
assert.EqualValues(t, 0x1, x1[0])
var x2 [1]byte
n2, e2 := bo.Read(x2[:])
assert.NoError(t, e2)
assert.Equal(t, 1, n2)
assert.EqualValues(t, 0x2, x2[0])
}
func TestOffsetReaderPropogatesErrors(t *testing.T) {
expected := fmt.Errorf("gitobj/pack: testing")
bo := &OffsetReaderAt{
r: &ErrReaderAt{Err: expected},
o: 1,
}
n, err := bo.Read(make([]byte, 1))
assert.Equal(t, expected, err)
assert.Equal(t, 0, n)
}
type ErrReaderAt struct {
Err error
}
func (e *ErrReaderAt) ReadAt(p []byte, at int64) (n int, err error) {
return 0, e.Err
}
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