Add integration test framework

Signed-off-by: Lantao Liu <lantaol@google.com>

integration/imagefs_info_test.go

@@ -0,0 +1,80 @@
+/*
+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 integration
+
+import (
+	"fmt"
+	"io/ioutil"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"k8s.io/kubernetes/pkg/kubelet/apis/cri/v1alpha1/runtime"
+)
+
+func TestImageFSInfo(t *testing.T) {
+	t.Logf("Pull an image to make sure image fs is not empty")
+	img, err := imageService.PullImage(&runtime.ImageSpec{Image: "busybox"}, nil)
+	require.NoError(t, err)
+	defer func() {
+		err := imageService.RemoveImage(&runtime.ImageSpec{Image: img})
+		assert.NoError(t, err)
+	}()
+	t.Logf("Create a sandbox to make sure there is an active snapshot")
+	config := PodSandboxConfig("running-pod", "imagefs")
+	sb, err := runtimeService.RunPodSandbox(config)
+	require.NoError(t, err)
+	defer func() {
+		assert.NoError(t, runtimeService.StopPodSandbox(sb))
+		assert.NoError(t, runtimeService.RemovePodSandbox(sb))
+	}()
+
+	// It takes time to populate imagefs stats. Use eventually
+	// to check for a period of time.
+	t.Logf("Check imagefs info")
+	var info *runtime.FilesystemUsage
+	require.NoError(t, Eventually(func() (bool, error) {
+		stats, err := imageService.ImageFsInfo()
+		if err != nil {
+			return false, err
+		}
+		if len(stats) == 0 {
+			return false, nil
+		}
+		if len(stats) >= 2 {
+			return false, fmt.Errorf("unexpected stats length: %d", len(stats))
+		}
+		info = stats[0]
+		if info.GetTimestamp() != 0 &&
+			info.GetUsedBytes().GetValue() != 0 &&
+			info.GetInodesUsed().GetValue() != 0 &&
+			info.GetStorageId().GetUuid() != "" {
+			return true, nil
+		}
+		return false, nil
+	}, time.Second, 30*time.Second))
+
+	t.Logf("Device uuid should exist")
+	files, err := ioutil.ReadDir("/dev/disk/by-uuid")
+	require.NoError(t, err)
+	var names []string
+	for _, f := range files {
+		names = append(names, f.Name())
+	}
+	assert.Contains(t, names, info.GetStorageId().GetUuid())
+}