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: pull_diff_test.go
    path of file: ./repos/gitea/tests/integration
    
    the code of the file until where you have to start completion: // Copyright 2019 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package integration

import (
	"net/http"
	"testing"

	"code.gitea.io/gitea/tests"

	"github.com/PuerkitoBio/goquery"
	"github.com/stretchr/testify/assert"
)

func TestPullDiff_CompletePRDiff(t *testing.T) {
	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files", false, []string{"test1.txt", "test10.txt", "test2.txt", "test3.txt", "test4.txt", "test5.txt", "test6.txt", "test7.txt", "test8.txt", "test9.txt"})
}

func TestPullDiff_SingleCommitPRDiff(t *testing.T) {
	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/commits/c5626fc9eff57eb1bb7b796b01d4d0f2f3f792a2", true, []string{"test3.txt"})
}

func TestPullDiff_CommitRangePRDiff(t *testing.T) {
	doTestPRDiff(t, "/user2/c
    
func doTestPRDiff(t *testing.T, prDiffURL string, reviewBtnDisabled bool, expectedFilenames []string) {
	defer tests.PrepareTestEnv(t)()

	session := loginUser(t, "user2")

	req := NewRequest(t, "GET", "/user2/commitsonpr/pulls")
	session.MakeRequest(t, req, http.StatusOK)

	// Get the given PR diff url
	req = NewRequest(t, "GET", prDiffURL)
	resp := session.MakeRequest(t, req, http.StatusOK)
	doc := NewHTMLParser(t, resp.Body)

	// Assert all files are visible.
	fileContents := doc.doc.Find(".file-content")
	numberOfFiles := fileContents.Length()

	assert.Equal(t, len(expectedFilenames), numberOfFiles)

	fileContents.Each(func(i int, s *goquery.Selection) {
		filename, _ := s.Attr("data-old-filename")
		assert.Equal(t, expectedFilenames[i], filename)
	})

	// Ensure the review button is enabled for full PR reviews
	assert.Equal(t, reviewBtnDisabled, doc.doc.Find(".js-btn-review").HasClass("disabled"))
}