Migrate to gotestyourself/assert

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

content/local/store_test.go

@@ -21,8 +21,8 @@ import (
 	"github.com/containerd/containerd/content"
 	"github.com/containerd/containerd/content/testsuite"
 	"github.com/containerd/containerd/testutil"
+	"github.com/gotestyourself/gotestyourself/assert"
 	"github.com/opencontainers/go-digest"
-	"github.com/stretchr/testify/require"
 )
 
 type memoryLabelStore struct {
@@ -339,11 +339,11 @@ func checkWrite(ctx context.Context, t checker, cs content.Store, dgst digest.Di
 
 func TestWriterTruncateRecoversFromIncompleteWrite(t *testing.T) {
 	tmpdir, err := ioutil.TempDir("", "test-local-content-store-recover")
-	require.NoError(t, err)
+	assert.NilError(t, err)
 	defer os.RemoveAll(tmpdir)
 
 	cs, err := NewStore(tmpdir)
-	require.NoError(t, err)
+	assert.NilError(t, err)
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -354,24 +354,24 @@ func TestWriterTruncateRecoversFromIncompleteWrite(t *testing.T) {
 	setupIncompleteWrite(ctx, t, cs, ref, total)
 
 	writer, err := cs.Writer(ctx, ref, total, "")
-	require.NoError(t, err)
+	assert.NilError(t, err)
 
-	require.NoError(t, writer.Truncate(0))
+	assert.NilError(t, writer.Truncate(0))
 
 	_, err = writer.Write(content)
-	require.NoError(t, err)
+	assert.NilError(t, err)
 
 	dgst := digest.FromBytes(content)
 	err = writer.Commit(ctx, total, dgst)
-	require.NoError(t, err)
+	assert.NilError(t, err)
 }
 
 func setupIncompleteWrite(ctx context.Context, t *testing.T, cs content.Store, ref string, total int64) {
 	writer, err := cs.Writer(ctx, ref, total, "")
-	require.NoError(t, err)
+	assert.NilError(t, err)
 
 	_, err = writer.Write([]byte("bad data"))
-	require.NoError(t, err)
+	assert.NilError(t, err)
 
-	require.NoError(t, writer.Close())
+	assert.NilError(t, writer.Close())
 }