Merge master into breakout_swarm

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

gateway/vendor/github.com/docker/distribution/digest/verifiers_test.go

@@ -0,0 +1,49 @@
+package digest
+
+import (
+	"bytes"
+	"crypto/rand"
+	"io"
+	"testing"
+)
+
+func TestDigestVerifier(t *testing.T) {
+	p := make([]byte, 1<<20)
+	rand.Read(p)
+	digest := FromBytes(p)
+
+	verifier, err := NewDigestVerifier(digest)
+	if err != nil {
+		t.Fatalf("unexpected error getting digest verifier: %s", err)
+	}
+
+	io.Copy(verifier, bytes.NewReader(p))
+
+	if !verifier.Verified() {
+		t.Fatalf("bytes not verified")
+	}
+}
+
+// TestVerifierUnsupportedDigest ensures that unsupported digest validation is
+// flowing through verifier creation.
+func TestVerifierUnsupportedDigest(t *testing.T) {
+	unsupported := Digest("bean:0123456789abcdef")
+
+	_, err := NewDigestVerifier(unsupported)
+	if err == nil {
+		t.Fatalf("expected error when creating verifier")
+	}
+
+	if err != ErrDigestUnsupported {
+		t.Fatalf("incorrect error for unsupported digest: %v", err)
+	}
+}
+
+// TODO(stevvooe): Add benchmarks to measure bytes/second throughput for
+// DigestVerifier.
+//
+// The relevant benchmark for comparison can be run with the following
+// commands:
+//
+// 	go test -bench . crypto/sha1
+//