Add unit test.

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

pkg/server/testing/mock_version_client.go

@@ -0,0 +1,65 @@
+/*
+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.
+*/
+
+// Automatically generated by MockGen. DO NOT EDIT!
+// Source: github.com/containerd/containerd/api/services/version (interfaces: VersionClient)
+
+package testing
+
+import (
+	version "github.com/containerd/containerd/api/services/version"
+	gomock "github.com/golang/mock/gomock"
+	empty "github.com/golang/protobuf/ptypes/empty"
+	context "golang.org/x/net/context"
+	grpc "google.golang.org/grpc"
+)
+
+// Mock of VersionClient interface
+type MockVersionClient struct {
+	ctrl     *gomock.Controller
+	recorder *_MockVersionClientRecorder
+}
+
+// Recorder for MockVersionClient (not exported)
+type _MockVersionClientRecorder struct {
+	mock *MockVersionClient
+}
+
+func NewMockVersionClient(ctrl *gomock.Controller) *MockVersionClient {
+	mock := &MockVersionClient{ctrl: ctrl}
+	mock.recorder = &_MockVersionClientRecorder{mock}
+	return mock
+}
+
+func (_m *MockVersionClient) EXPECT() *_MockVersionClientRecorder {
+	return _m.recorder
+}
+
+func (_m *MockVersionClient) Version(_param0 context.Context, _param1 *empty.Empty, _param2 ...grpc.CallOption) (*version.VersionResponse, error) {
+	_s := []interface{}{_param0, _param1}
+	for _, _x := range _param2 {
+		_s = append(_s, _x)
+	}
+	ret := _m.ctrl.Call(_m, "Version", _s...)
+	ret0, _ := ret[0].(*version.VersionResponse)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+func (_mr *_MockVersionClientRecorder) Version(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
+	_s := append([]interface{}{arg0, arg1}, arg2...)
+	return _mr.mock.ctrl.RecordCall(_mr.mock, "Version", _s...)
+}