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: compute_test.go
    path of file: ./repos/golang-samples/compute
    
    the code of the file until where you have to start completion: // Copyright 2021 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.

package snippets

import (
	"bytes"
	"context"
	"fmt"
	"math/rand"
	"strings"
	"testing"
	"time"

	compute "cloud.google.com/go/compute/apiv1"
	"github.com/GoogleCloudPlatform/golang-samples/internal/testutil"
	computepb "google.golang.org/genproto/googleapis/cloud/compute/v1"
)

func TestComputeSnippets(t *testing.T) {
	var seededRand *rand.Rand = rand.New(
		rand.NewSource(time.Now().UnixNano()))
	tc := testutil.SystemTest(t)
	zone := "europe-central2-b"
	instanceName := "test-" + fmt.Sprint(seededRand.Int())
	instanceName2 := "test-" + fmt.Sprint(seededRand.Int())
	machineType := "n1-standard-1"
	sourceImage := "projects/debian-cloud/global/images/family/debian-10"
	networkName := "global/networks/default"

	buf := &bytes.Buffer{}

	if err := createInstance(buf, tc.ProjectID, zone, instanceName, machineType, sourceImage, networkName); err != nil {
		t.Errorf("createInstance got err: %v", err)
	}

	expectedResult := "Instance created"
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("createInstance got %q, want %q", got, expectedResult)
	}

	buf.Reset()

	if err := getInstance(buf, tc.ProjectID, zone, instanceName); err != nil {
		t.Errorf("getInstance got err: %v", err)
	}

	expectedResult = fmt.Sprintf("Instance: %s", instanceName)
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("getInstance got %q, want %q", got, expectedResult)
	}

	buf.Reset()

	if err := listInstances(buf, tc.ProjectID, zone); err != nil {
		t.Errorf("listInstances got err: %v", err)
	}

	expectedResult = "Instances found in zone"
	expectedResult2 := fmt.Sprintf("- %s", instanceName)
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("listInstances got %q, want %q", got, expectedResult)
	}
	if got := buf.String(); !strings.Contains(got, expectedResult2) {
		t.Errorf("listInstances got %q, want %q", got, expectedResult2)
	}

	buf.Reset()

	if err := listAllInstances(buf, tc.ProjectID); err != nil {
		t.Errorf("listAllInstances got err: %v", err)
	}

	expectedResult = "Instances found:"
	expectedResult2 = fmt.Sprintf("zones/%s\n", zone)
	expectedResult3 := fmt.Sprintf("- %s", instanceName)
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("listAllInstances got %q, want %q", got, expectedResult)
	}
	if got := buf.String(); !strings.Contains(got, expectedResult2) {
		t.Errorf("listAllInstances got %q, want %q", got, expectedResult2)
	}
	if got := buf.String(); !strings.Contains(got, expectedResult2) {
		t.Errorf("listAllInstances got %q, want %q", got, expectedResult3)
	}

	buf.Reset()

	if err := deleteInstance(buf, tc.ProjectID, zone, instanceName); err != nil {
		t.Errorf("deleteInstance got err: %v", err)
	}

	expectedResult = "Instance deleted"
	if got := buf.String(); !strings
    
func TestComputeSnippets(t *testing.T) {
	var seededRand *rand.Rand = rand.New(
		rand.NewSource(time.Now().UnixNano()))
	tc := testutil.SystemTest(t)
	zone := "europe-central2-b"
	instanceName := "test-" + fmt.Sprint(seededRand.Int())
	instanceName2 := "test-" + fmt.Sprint(seededRand.Int())
	machineType := "n1-standard-1"
	sourceImage := "projects/debian-cloud/global/images/family/debian-10"
	networkName := "global/networks/default"

	buf := &bytes.Buffer{}

	if err := createInstance(buf, tc.ProjectID, zone, instanceName, machineType, sourceImage, networkName); err != nil {
		t.Errorf("createInstance got err: %v", err)
	}

	expectedResult := "Instance created"
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("createInstance got %q, want %q", got, expectedResult)
	}

	buf.Reset()

	if err := getInstance(buf, tc.ProjectID, zone, instanceName); err != nil {
		t.Errorf("getInstance got err: %v", err)
	}

	expectedResult = fmt.Sprintf("Instance: %s", instanceName)
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("getInstance got %q, want %q", got, expectedResult)
	}

	buf.Reset()

	if err := listInstances(buf, tc.ProjectID, zone); err != nil {
		t.Errorf("listInstances got err: %v", err)
	}

	expectedResult = "Instances found in zone"
	expectedResult2 := fmt.Sprintf("- %s", instanceName)
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("listInstances got %q, want %q", got, expectedResult)
	}
	if got := buf.String(); !strings.Contains(got, expectedResult2) {
		t.Errorf("listInstances got %q, want %q", got, expectedResult2)
	}

	buf.Reset()

	if err := listAllInstances(buf, tc.ProjectID); err != nil {
		t.Errorf("listAllInstances got err: %v", err)
	}

	expectedResult = "Instances found:"
	expectedResult2 = fmt.Sprintf("zones/%s\n", zone)
	expectedResult3 := fmt.Sprintf("- %s", instanceName)
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("listAllInstances got %q, want %q", got, expectedResult)
	}
	if got := buf.String(); !strings.Contains(got, expectedResult2) {
		t.Errorf("listAllInstances got %q, want %q", got, expectedResult2)
	}
	if got := buf.String(); !strings.Contains(got, expectedResult2) {
		t.Errorf("listAllInstances got %q, want %q", got, expectedResult3)
	}

	buf.Reset()

	if err := deleteInstance(buf, tc.ProjectID, zone, instanceName); err != nil {
		t.Errorf("deleteInstance got err: %v", err)
	}

	expectedResult = "Instance deleted"
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("deleteInstance got %q, want %q", got, expectedResult)
	}

	if err := createInstance(buf, tc.ProjectID, zone, instanceName2, machineType, sourceImage, networkName); err != nil {
		t.Errorf("createInstance got err: %v", err)
	}

	buf.Reset()

	if err := changeMachineType(buf, tc.ProjectID, zone, instanceName2, "e2-standard-2"); err != nil {
		t.Errorf("changeMachineType got err: %v", err)
	}

	expectedResult = "Instance updated"
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("waitForOperation got %q, want %q", got, expectedResult)
	}

	ctx := context.Background()
	instancesClient, err := compute.NewInstancesRESTClient(ctx)
	if err != nil {
		t.Errorf("NewInstancesRESTClient: %v", err)
	}
	defer instancesClient.Close()

	req := &computepb.DeleteInstanceRequest{
		Project:  tc.ProjectID,
		Zone:     zone,
		Instance: instanceName2,
	}

	op, err := instancesClient.Delete(ctx, req)
	if err != nil {
		t.Errorf("Delete instance request: %v", err)
	}

	buf.Reset()

	if err := waitForOperation(buf, tc.ProjectID, op); err != nil {
		t.Errorf("waitForOperation got err: %v", err)
	}

	expectedResult = "Operation finished"
	if got := buf.String(); !strings.Contains(got, expectedResult) {
		t.Errorf("waitForOperation got %q, want %q", got, expectedResult)
	}
}