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: firewall_test.go
    path of file: ./repos/golang-samples/compute/firewall
    
    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 TestFirewallSnippets(t *testing.T) {
	ctx := context.Background()
	firewallsClient, err := compute.NewFirewallsRESTClient(ctx)
	if err != nil {
		t.Fatalf("NewInstancesRESTClient: %v", err)
	}
	defer firewallsClient.Close()

	var seededRand *rand.Rand = rand.New(
		rand.NewSource(time.Now().UnixNano()))
	tc := testutil.SystemTest(t)
	buf := &by
    
func TestFirewallSnippets(t *testing.T) {
	ctx := context.Background()
	firewallsClient, err := compute.NewFirewallsRESTClient(ctx)
	if err != nil {
		t.Fatalf("NewInstancesRESTClient: %v", err)
	}
	defer firewallsClient.Close()

	var seededRand *rand.Rand = rand.New(
		rand.NewSource(time.Now().UnixNano()))
	tc := testutil.SystemTest(t)
	buf := &bytes.Buffer{}

	firewallRuleName := "test-firewall-rule" + fmt.Sprint(seededRand.Int())
	defaultNetwork := "global/networks/default"

	if err := createFirewallRule(buf, tc.ProjectID, firewallRuleName, defaultNetwork); err != nil {
		t.Fatalf("createFirewallRule got err: %v", err)
	}

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

	buf.Reset()

	req := &computepb.GetFirewallRequest{
		Project:  tc.ProjectID,
		Firewall: firewallRuleName,
	}

	firewallBefore, err := firewallsClient.Get(ctx, req)
	if err != nil {
		t.Errorf("unable to get firewall rule: %v", err)
	}

	if firewallBefore.GetPriority() != 1000 {
		t.Errorf(fmt.Sprintf("Got: %q; want %q", firewallBefore.GetPriority(), 1000))
	}

	var newFirewallPriority int32 = 500
	if err := patchFirewallPriority(buf, tc.ProjectID, firewallRuleName, newFirewallPriority); err != nil {
		t.Fatalf("patchFirewallPriority got err: %v", err)
	}

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

	firewallAfter, err := firewallsClient.Get(ctx, req)
	if err != nil {
		t.Errorf("unable to get firewall rule: %v", err)
	}

	if firewallAfter.GetPriority() != newFirewallPriority {
		t.Errorf(fmt.Sprintf("Got: %q; want %q", firewallAfter.GetPriority(), newFirewallPriority))
	}

	buf.Reset()

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

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

	buf.Reset()

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

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