You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mock_test.go
    path of file: ./repos/gitkube/vendor/cloud.google.com/go/container/apiv1
    
    the code of the file until where you have to start completion: // Copyright 2018 Google LLC
//
// 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
//
//     https://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.

// AUTO-GENERATED CODE. DO NOT EDIT.

package container

import (
	emptypb "github.com/golang/protobuf/ptypes/empty"
	containerpb "google.golang.org/genproto/googleapis/container/v1"
)

import (
	"flag"
	"fmt"
	"io"
	"log"
	"net"
	"os"
	"strings"
	"testing"

	"github.com/golang/protobuf/proto"
	"github.com/golang/protobuf/ptypes"
	"golang.org/x/net/context"
	"google.golang.org/api/option"
	status "google.golang.org/genproto/googleapis/rpc/stat
    
func TestClusterManagerStartIPRotation(t *testing.T) {
	var name string = "name3373707"
	var zone2 string = "zone2-696322977"
	var detail string = "detail-1335224239"
	var statusMessage string = "statusMessage-239442758"
	var selfLink string = "selfLink-1691268851"
	var targetLink string = "targetLink-2084812312"
	var startTime string = "startTime-1573145462"
	var endTime string = "endTime1725551537"
	var expectedResponse = &containerpb.Operation{
		Name:          name,
		Zone:          zone2,
		Detail:        detail,
		StatusMessage: statusMessage,
		SelfLink:      selfLink,
		TargetLink:    targetLink,
		StartTime:     startTime,
		EndTime:       endTime,
	}

	mockClusterManager.err = nil
	mockClusterManager.reqs = nil

	mockClusterManager.resps = append(mockClusterManager.resps[:0], expectedResponse)

	var projectId string = "projectId-1969970175"
	var zone string = "zone3744684"
	var clusterId string = "clusterId240280960"
	var request = &containerpb.StartIPRotationRequest{
		ProjectId: projectId,
		Zone:      zone,
		ClusterId: clusterId,
	}

	c, err := NewClusterManagerClient(context.Background(), clientOpt)
	if err != nil {
		t.Fatal(err)
	}

	resp, err := c.StartIPRotation(context.Background(), request)

	if err != nil {
		t.Fatal(err)
	}

	if want, got := request, mockClusterManager.reqs[0]; !proto.Equal(want, got) {
		t.Errorf("wrong request %q, want %q", got, want)
	}

	if want, got := expectedResponse, resp; !proto.Equal(want, got) {
		t.Errorf("wrong response %q, want %q)", got, want)
	}
}