Add unit test for func in remotes/docker/pusher.go

Signed-off-by: Hu Shuai <hus.fnst@cn.fujitsu.com>

remotes/docker/pusher_test.go

@@ -0,0 +1,52 @@
+/*
+   Copyright The containerd Authors.
+
+   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
+
+       http://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 docker
+
+import (
+	"reflect"
+	"testing"
+
+	digest "github.com/opencontainers/go-digest"
+)
+
+func TestGetManifestPath(t *testing.T) {
+	for _, tc := range []struct {
+		object   string
+		dgst     digest.Digest
+		expected []string
+	}{
+		{
+			object:   "foo",
+			dgst:     "bar",
+			expected: []string{"manifests", "foo"},
+		},
+		{
+			object:   "foo@bar",
+			dgst:     "bar",
+			expected: []string{"manifests", "foo"},
+		},
+		{
+			object:   "foo@bar",
+			dgst:     "foobar",
+			expected: []string{"manifests", "foobar"},
+		},
+	} {
+		if got := getManifestPath(tc.object, tc.dgst); !reflect.DeepEqual(got, tc.expected) {
+			t.Fatalf("expected %v, but got %v", tc.expected, got)
+		}
+	}
+}