initial implementation for image management

Signed-off-by: Mike Brown <brownwm@us.ibm.com>

pkg/metadata/image_metadata_test.go

@@ -0,0 +1,87 @@
+/*
+Copyright 2017 The Kubernetes 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 metadata
+
+import (
+	"testing"
+
+	assertlib "github.com/stretchr/testify/assert"
+
+	"github.com/kubernetes-incubator/cri-containerd/pkg/metadata/store"
+)
+
+func TestImageMetadataStore(t *testing.T) {
+	imageMetadataMap := map[string]*ImageMetadata{
+		"1": {
+			ID:   "1", // TODO(mikebrow): fill
+			Size: 10,
+		},
+		"2": {
+			ID:   "2",
+			Size: 20,
+		},
+		"3": {
+			ID:   "3",
+			Size: 30,
+		},
+	}
+	assert := assertlib.New(t)
+
+	s := NewImageMetadataStore(store.NewMetadataStore())
+
+	t.Logf("should be able to create image metadata")
+	for _, meta := range imageMetadataMap {
+		assert.NoError(s.Create(*meta))
+	}
+
+	t.Logf("should be able to get image metadata")
+	for id, expectMeta := range imageMetadataMap {
+		meta, err := s.Get(id)
+		assert.NoError(err)
+		assert.Equal(expectMeta, meta)
+	}
+
+	t.Logf("should be able to list image metadata")
+	imgs, err := s.List()
+	assert.NoError(err)
+	assert.Len(imgs, 3)
+
+	t.Logf("should be able to update image metadata")
+	testID := "2"
+	newSize := uint64(200)
+	expectMeta := *imageMetadataMap[testID]
+	expectMeta.Size = newSize
+	err = s.Update(testID, func(o ImageMetadata) (ImageMetadata, error) {
+		o.Size = newSize
+		return o, nil
+	})
+	assert.NoError(err)
+	newMeta, err := s.Get(testID)
+	assert.NoError(err)
+	assert.Equal(&expectMeta, newMeta)
+
+	t.Logf("should be able to delete image metadata")
+	assert.NoError(s.Delete(testID))
+	imgs, err = s.List()
+	assert.NoError(err)
+	assert.Len(imgs, 2)
+
+	t.Logf("get should return nil without error after deletion")
+	meta, err := s.Get(testID)
+	assert.NoError(err)
+	assert.Nil(meta)
+}