--- /dev/null
+/*
+ *
+ * Copyright 2017 gRPC 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 mock_helloworld_test
+
+import (
+ "fmt"
+ "testing"
+
+ "github.com/golang/mock/gomock"
+ "github.com/golang/protobuf/proto"
+ "golang.org/x/net/context"
+ helloworld "google.golang.org/grpc/examples/helloworld/helloworld"
+ hwmock "google.golang.org/grpc/examples/helloworld/mock_helloworld"
+)
+
+// rpcMsg implements the gomock.Matcher interface
+type rpcMsg struct {
+ msg proto.Message
+}
+
+func (r *rpcMsg) Matches(msg interface{}) bool {
+ m, ok := msg.(proto.Message)
+ if !ok {
+ return false
+ }
+ return proto.Equal(m, r.msg)
+}
+
+func (r *rpcMsg) String() string {
+ return fmt.Sprintf("is %s", r.msg)
+}
+
+func TestSayHello(t *testing.T) {
+ ctrl := gomock.NewController(t)
+ defer ctrl.Finish()
+ mockGreeterClient := hwmock.NewMockGreeterClient(ctrl)
+ req := &helloworld.HelloRequest{Name: "unit_test"}
+ mockGreeterClient.EXPECT().SayHello(
+ gomock.Any(),
+ &rpcMsg{msg: req},
+ ).Return(&helloworld.HelloReply{Message: "Mocked Interface"}, nil)
+ testSayHello(t, mockGreeterClient)
+}
+
+func testSayHello(t *testing.T, client helloworld.GreeterClient) {
+ r, err := client.SayHello(context.Background(), &helloworld.HelloRequest{Name: "unit_test"})
+ if err != nil || r.Message != "Mocked Interface" {
+ t.Errorf("mocking failed")
+ }
+ t.Log("Reply : ", r.Message)
+}