update vendor

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/opencontainers/go-digest/verifiers_test.go

@@ -0,0 +1,80 @@
+// Copyright 2017 Docker, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package digest
+
+import (
+	"bytes"
+	"crypto/rand"
+	"io"
+	"reflect"
+	"testing"
+)
+
+func TestDigestVerifier(t *testing.T) {
+	p := make([]byte, 1<<20)
+	rand.Read(p)
+	digest := FromBytes(p)
+
+	verifier := digest.Verifier()
+
+	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) {
+	for _, testcase := range []struct {
+		Name     string
+		Digest   Digest
+		Expected interface{} // expected panic target
+	}{
+		{
+			Name:     "Empty",
+			Digest:   "",
+			Expected: "no ':' separator in digest \"\"",
+		},
+		{
+			Name:     "EmptyAlg",
+			Digest:   ":",
+			Expected: "empty digest algorithm, validate before calling Algorithm.Hash()",
+		},
+		{
+			Name:     "Unsupported",
+			Digest:   Digest("bean:0123456789abcdef"),
+			Expected: "bean not available (make sure it is imported)",
+		},
+		{
+			Name:     "Garbage",
+			Digest:   Digest("sha256-garbage:pure"),
+			Expected: "sha256-garbage not available (make sure it is imported)",
+		},
+	} {
+		t.Run(testcase.Name, func(t *testing.T) {
+			expected := testcase.Expected
+			defer func() {
+				recovered := recover()
+				if !reflect.DeepEqual(recovered, expected) {
+					t.Fatalf("unexpected recover: %v != %v", recovered, expected)
+				}
+			}()
+
+			_ = testcase.Digest.Verifier()
+		})
+	}
+}