Avoid containerd access as much as possible.

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

pkg/server/sandbox_stop_test.go

@@ -0,0 +1,68 @@
+/*
+Copyright 2018 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 server
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/net/context"
+
+	sandboxstore "github.com/containerd/cri-containerd/pkg/store/sandbox"
+)
+
+func TestWaitSandboxStop(t *testing.T) {
+	id := "test-id"
+	for desc, test := range map[string]struct {
+		state     sandboxstore.State
+		cancel    bool
+		timeout   time.Duration
+		expectErr bool
+	}{
+		"should return error if timeout exceeds": {
+			state:     sandboxstore.StateReady,
+			timeout:   2 * stopCheckPollInterval,
+			expectErr: true,
+		},
+		"should return error if context is cancelled": {
+			state:     sandboxstore.StateReady,
+			timeout:   time.Hour,
+			cancel:    true,
+			expectErr: true,
+		},
+		"should not return error if sandbox is stopped before timeout": {
+			state:     sandboxstore.StateNotReady,
+			timeout:   time.Hour,
+			expectErr: false,
+		},
+	} {
+		c := newTestCRIContainerdService()
+		sandbox := sandboxstore.NewSandbox(
+			sandboxstore.Metadata{ID: id},
+			sandboxstore.Status{State: test.state},
+		)
+		ctx := context.Background()
+		if test.cancel {
+			cancelledCtx, cancel := context.WithCancel(ctx)
+			cancel()
+			ctx = cancelledCtx
+		}
+		err := c.waitSandboxStop(ctx, sandbox, test.timeout)
+		assert.Equal(t, test.expectErr, err != nil, desc)
+	}
+}