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package pack
import (
"bytes"
"compress/zlib"
"testing"
"github.com/stretchr/testify/assert"
)
func TestChainBaseDecompressesData(t *testing.T) {
const contents = "Hello, world!\n"
compressed, err := compress(contents)
assert.NoError(t, err)
var buf bytes.Buffer
_, err = buf.Write([]byte{0x0, 0x0, 0x0, 0x0})
assert.NoError(t, err)
_, err = buf.Write(compressed)
assert.NoError(t, err)
_, err = buf.Write([]byte{0x0, 0x0, 0x0, 0x0})
assert.NoError(t, err)
base := &ChainBase{
offset: 4,
size: int64(len(contents)),
r: bytes.NewReader(buf.Bytes()),
}
unpacked, err := base.Unpack()
assert.NoError(t, err)
assert.Equal(t, contents, string(unpacked))
}
func TestChainBaseTypeReturnsType(t *testing.T) {
b := &ChainBase{
typ: TypeCommit,
}
assert.Equal(t, TypeCommit, b.Type())
}
func compress(base string) ([]byte, error) {
var buf bytes.Buffer
zw := zlib.NewWriter(&buf)
if _, err := zw.Write([]byte(base)); err != nil {
return nil, err
}
if err := zw.Close(); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
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