vendor: remove dep and use vndr

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

vendor/github.com/containers/image/pkg/compression/compression_test.go

@@ -1,86 +0,0 @@
-package compression
-
-import (
-	"bytes"
-	"io"
-	"io/ioutil"
-	"os"
-	"testing"
-
-	"github.com/pkg/errors"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func TestDetectCompression(t *testing.T) {
-	cases := []struct {
-		filename      string
-		unimplemented bool
-	}{
-		{"fixtures/Hello.uncompressed", false},
-		{"fixtures/Hello.gz", false},
-		{"fixtures/Hello.bz2", false},
-		{"fixtures/Hello.xz", true},
-	}
-
-	// The original stream is preserved.
-	for _, c := range cases {
-		originalContents, err := ioutil.ReadFile(c.filename)
-		require.NoError(t, err, c.filename)
-
-		stream, err := os.Open(c.filename)
-		require.NoError(t, err, c.filename)
-		defer stream.Close()
-
-		_, updatedStream, err := DetectCompression(stream)
-		require.NoError(t, err, c.filename)
-
-		updatedContents, err := ioutil.ReadAll(updatedStream)
-		require.NoError(t, err, c.filename)
-		assert.Equal(t, originalContents, updatedContents, c.filename)
-	}
-
-	// The correct decompressor is chosen, and the result is as expected.
-	for _, c := range cases {
-		stream, err := os.Open(c.filename)
-		require.NoError(t, err, c.filename)
-		defer stream.Close()
-
-		decompressor, updatedStream, err := DetectCompression(stream)
-		require.NoError(t, err, c.filename)
-
-		var uncompressedStream io.Reader
-		switch {
-		case decompressor == nil:
-			uncompressedStream = updatedStream
-		case c.unimplemented:
-			_, err := decompressor(updatedStream)
-			assert.Error(t, err)
-			continue
-		default:
-			s, err := decompressor(updatedStream)
-			require.NoError(t, err)
-			uncompressedStream = s
-		}
-
-		uncompressedContents, err := ioutil.ReadAll(uncompressedStream)
-		require.NoError(t, err, c.filename)
-		assert.Equal(t, []byte("Hello"), uncompressedContents, c.filename)
-	}
-
-	// Empty input is handled reasonably.
-	decompressor, updatedStream, err := DetectCompression(bytes.NewReader([]byte{}))
-	require.NoError(t, err)
-	assert.Nil(t, decompressor)
-	updatedContents, err := ioutil.ReadAll(updatedStream)
-	require.NoError(t, err)
-	assert.Equal(t, []byte{}, updatedContents)
-
-	// Error reading input
-	reader, writer := io.Pipe()
-	defer reader.Close()
-	writer.CloseWithError(errors.New("Expected error reading input in DetectCompression"))
-	_, _, err = DetectCompression(reader)
-	assert.Error(t, err)
-}

vendor/github.com/containers/image/pkg/compression/fixtures/Hello.uncompressed

@@ -1 +0,0 @@
-Hello