86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
package copy
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import (
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"bytes"
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"io"
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"io/ioutil"
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"os"
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"testing"
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"github.com/pkg/errors"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestDetectCompression(t *testing.T) {
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cases := []struct {
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filename string
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unimplemented bool
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}{
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{"fixtures/Hello.uncompressed", false},
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{"fixtures/Hello.gz", false},
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{"fixtures/Hello.bz2", false},
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{"fixtures/Hello.xz", true},
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}
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// The original stream is preserved.
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for _, c := range cases {
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originalContents, err := ioutil.ReadFile(c.filename)
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require.NoError(t, err, c.filename)
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stream, err := os.Open(c.filename)
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require.NoError(t, err, c.filename)
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defer stream.Close()
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_, updatedStream, err := detectCompression(stream)
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require.NoError(t, err, c.filename)
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updatedContents, err := ioutil.ReadAll(updatedStream)
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require.NoError(t, err, c.filename)
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assert.Equal(t, originalContents, updatedContents, c.filename)
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}
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// The correct decompressor is chosen, and the result is as expected.
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for _, c := range cases {
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stream, err := os.Open(c.filename)
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require.NoError(t, err, c.filename)
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defer stream.Close()
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decompressor, updatedStream, err := detectCompression(stream)
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require.NoError(t, err, c.filename)
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var uncompressedStream io.Reader
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switch {
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case decompressor == nil:
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uncompressedStream = updatedStream
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case c.unimplemented:
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_, err := decompressor(updatedStream)
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assert.Error(t, err)
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continue
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default:
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s, err := decompressor(updatedStream)
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require.NoError(t, err)
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uncompressedStream = s
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}
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uncompressedContents, err := ioutil.ReadAll(uncompressedStream)
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require.NoError(t, err, c.filename)
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assert.Equal(t, []byte("Hello"), uncompressedContents, c.filename)
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}
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// Empty input is handled reasonably.
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decompressor, updatedStream, err := detectCompression(bytes.NewReader([]byte{}))
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require.NoError(t, err)
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assert.Nil(t, decompressor)
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updatedContents, err := ioutil.ReadAll(updatedStream)
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require.NoError(t, err)
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assert.Equal(t, []byte{}, updatedContents)
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// Error reading input
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reader, writer := io.Pipe()
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defer reader.Close()
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writer.CloseWithError(errors.New("Expected error reading input in detectCompression"))
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_, _, err = detectCompression(reader)
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assert.Error(t, err)
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}
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