Puppeteer Angular 概要

¥Puppeteer Angular Schematic

将基于 Puppeteer 的 e2e 测试添加到你的 Angular 项目中。

¥Adds Puppeteer-based e2e tests to your Angular project.

新手入门

¥Getting started

在 Angular CLI 应用目录中运行以下命令并按照提示操作。

¥Run the command below in an Angular CLI app directory and follow the prompts.

请注意，这会将原理图添加为项目的依赖。

¥Note this will add the schematic as a dependency to your project.

ng add @puppeteer/ng-schematics

或者你可以使用相同的命令，后跟下面的 options。

¥Or you can use the same command followed by the options below.

目前，该原理图支持以下测试运行程序：

¥Currently, this schematic supports the following test runners:

• Jasmine

• Jest

• Mocha

• Node 测试运行器

  ¥Node Test Runner

安装原理图后，你可以运行 E2E 测试：

¥With the schematics installed you can run E2E tests:

ng e2e

选项

¥Options

将原理图添加到项目时，你可以提供以下选项：

¥When adding schematics to your project you can to provide following options:

选项	描述	值	必需的
--test-runner	与 Puppeteer 一起安装的测试框架。	"jasmine"、"jest"、"mocha"、"node"	true

创建单个测试文件

¥Creating a single test file

Puppeteer Angular Schematic 公开了一种创建单个测试文件的方法。

¥Puppeteer Angular Schematic exposes a method to create a single test file.

ng generate @puppeteer/ng-schematics:e2e "<TestName>"

同时运行测试服务器和开发服务器

¥Running test server and dev server at the same time

默认情况下，E2E 测试将在与 ng start 相同的端口上运行应用。为了避免这种情况，你可以指定端口并将 angular.json 更新为 e2e 或 puppeteer（取决于初始设置）：

¥By default the E2E test will run the app on the same port as ng start. To avoid this you can specify the port the an the angular.json Update either e2e or puppeteer (depending on the initial setup) to:

{
  "e2e": {
    "builder": "@puppeteer/ng-schematics:puppeteer",
    "options": {
      "commands": [...],
      "devServerTarget": "sandbox:serve",
      "testRunner": "<TestRunner>",
      "port": 8080
    },
    ...
}

现在将 E2E 测试文件 utils.ts baseUrl 更新为：

¥Now update the E2E test file utils.ts baseUrl to:

const baseUrl = 'http://localhost:8080';

贡献

¥Contributing

查看我们的 贡献指南，了解你需要在 Puppeteer 存储库中开发的内容。

¥Check out our contributing guide to get an overview of what you need to develop in the Puppeteer repo.

沙箱冒烟测试

¥Sandbox smoke tests

为了使集成更容易，可以使用单个命令运行冒烟测试，这将创建 Angular 的全新安装（单个应用和 milti 应用项目）。然后它将在其中安装原理图并运行初始 e2e 测试：

¥To make integration easier smoke test can be run with a single command, that will create a fresh install of Angular (single application and a milti application projects). Then it will install the schematics inside them and run the initial e2e tests:

node tools/smoke.mjs

单元测试

¥Unit Testing

该原理图利用 @angular-devkit/schematics/testing 来验证正确的文件创建和 package.json 更新。执行测试套件：

¥The schematics utilize @angular-devkit/schematics/testing for verifying correct file creation and package.json updates. To execute the test suit:

npm run test

从 Protractor 迁移

¥Migrating from Protractor

入口点

¥Entry point

Puppeteer 有自己的 browser 来暴露浏览器进程。Protractor 的 browser 的更接近比较是 Puppeteer 的 page。

¥Puppeteer has its own browser that exposes the browser process. A more closes comparison for Protractor's browser would be Puppeteer's page.

// Testing framework specific imports

import {setupBrowserHooks, getBrowserState} from './utils';

describe('<Test Name>', function () {
  setupBrowserHooks();
  it('is running', async function () {
    const {page} = getBrowserState();
    // Query elements
    await page
      .locator('my-component')
      // Click on the element once found
      .click();
  });
});

获取元素属性

¥Getting element properties

你可以轻松获取元素的任何属性。

¥You can easily get any property of the element.

// Testing framework specific imports

import {setupBrowserHooks, getBrowserState} from './utils';

describe('<Test Name>', function () {
  setupBrowserHooks();
  it('is running', async function () {
    const {page} = getBrowserState();
    // Query elements
    const elementText = await page
      .locator('.my-component')
      .map(button => button.innerText)
      // Wait for element to show up
      .wait();

    // Assert via assertion library
  });
});

查询选择器

¥Query Selectors

Puppeteer 支持多种类型的选择器，即 CSS、ARIA、文本、XPath 和 pierce 选择器。下表显示了 Puppeteer 与 Protractor By 的等效项。

¥Puppeteer supports multiple types of selectors, namely, the CSS, ARIA, text, XPath and pierce selectors. The following table shows Puppeteer's equivalents to Protractor By.

为了提高可靠性并减少片状现象，请尝试我们的实验 Locators API

¥For improved reliability and reduced flakiness try our Experimental Locators API

经过	Protractor 代码	Puppeteer 查询选择器
CSS（单）	$(by.css('<CSS>'))	page.$('<CSS>')
CSS（多个）	$$(by.css('<CSS>'))	page.$$('<CSS>')
ID	$(by.id('<ID>'))	page.$('#<ID>')
CssContainingText	$(by.cssContainingText('<CSS>', '<TEXT>'))	page.$('<CSS> ::-p-text(<TEXT>)') `
DeepCss	$(by.deepCss('<CSS>'))	page.$(':scope >>> <CSS>')
XPath	$(by.xpath('<XPATH>'))	page.$('::-p-xpath(<XPATH>)')
JS	$(by.js('document.querySelector("<CSS>")'))	page.evaluateHandle(() => document.querySelector('<CSS>'))

对于高级用例，例如 Protractor 的 by.addLocator，你可以检查 Puppeteer 的 自定义选择器。

¥For advanced use cases such as Protractor's by.addLocator you can check Puppeteer's Custom selectors.

动作选择器

¥Actions Selectors

Puppeteer 允许你执行所有必要的操作来测试你的应用。

¥Puppeteer allows you to all necessary actions to allow test your application.

// Click on the element.
element(locator).click();
// Puppeteer equivalent
await page.locator(locator).click();

// Send keys to the element (usually an input).
element(locator).sendKeys('my text');
// Puppeteer equivalent
await page.locator(locator).fill('my text');

// Clear the text in an element (usually an input).
element(locator).clear();
// Puppeteer equivalent
await page.locator(locator).fill('');

// Get the value of an attribute, for example, get the value of an input.
element(locator).getAttribute('value');
// Puppeteer equivalent
const element = await page.locator(locator).waitHandle();
const value = await element.getProperty('value');

示例

¥Example

量角器测试示例：

¥Sample Protractor test:

describe('Protractor Demo', function () {
  it('should add one and two', function () {
    browser.get('http://juliemr.github.io/protractor-demo/');
    element(by.model('first')).sendKeys(1);
    element(by.model('second')).sendKeys(2);

    element(by.id('gobutton')).click();

    expect(element(by.binding('latest')).getText()).toEqual('3');
  });
});

Puppeteer 迁移示例：

¥Sample Puppeteer migration:

import {setupBrowserHooks, getBrowserState} from './utils';

describe('Puppeteer Demo', function () {
  setupBrowserHooks();
  it('should add one and two', function () {
    const {page} = getBrowserState();
    await page.goto('http://juliemr.github.io/protractor-demo/');

    await page.locator('.form-inline > input:nth-child(1)').fill('1');
    await page.locator('.form-inline > input:nth-child(2)').fill('2');
    await page.locator('#gobutton').fill('2');

    const result = await page
      .locator('.table tbody td:last-of-type')
      .map(header => header.innerText)
      .wait();

    expect(result).toEqual('3');
  });
});