157 lines
5.0 KiB
Markdown
157 lines
5.0 KiB
Markdown
# Puppeteer Angular Schematic
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Adds Puppeteer-based e2e tests to your Angular project.
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## Getting started
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Run the command below in an Angular CLI app directory and follow the prompts.
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> Note this will add the schematic as a dependency to your project.
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```bash
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ng add @puppeteer/ng-schematics
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```
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Or you can use the same command followed by the [options](#options) below.
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Currently, this schematic supports the following test runners:
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- [**Jasmine**](https://jasmine.github.io/)
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- [**Jest**](https://jestjs.io/)
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- [**Mocha**](https://mochajs.org/)
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- [**Node Test Runner**](https://nodejs.org/api/test.html)
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With the schematics installed you can run E2E tests:
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```bash
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ng e2e
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```
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### Options
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When adding schematics to your project you can to provide following options:
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| Option | Description | Value | Required |
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| -------------- | ------------------------------------------------------ | ------------------------------------------ | -------- |
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| `--testRunner` | The testing framework to install along side Puppeteer. | `"jasmine"`, `"jest"`, `"mocha"`, `"node"` | `true` |
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## Creating a single test file
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Puppeteer Angular Schematic exposes a method to create a single test file.
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```bash
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ng generate @puppeteer/ng-schematics:test "<TestName>"
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```
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### Running test server and dev server at the same time
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By default the E2E test will run the app on the same port as `ng start`.
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To avoid this you can specify the port the an the `angular.json`
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Update either `e2e` or `puppeteer` (depending on the initial setup) to:
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```json
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{
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"e2e": {
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"builder": "@puppeteer/ng-schematics:puppeteer",
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"options": {
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"commands": [...],
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"devServerTarget": "sandbox:serve",
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"testRunner": "<TestRunner>",
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"port": 8080
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},
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...
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}
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```
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Now update the E2E test file `utils.ts` baseUrl to:
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```ts
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const baseUrl = 'http://localhost:8080';
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```
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## Contributing
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Check out our [contributing guide](https://pptr.dev/contributing) to get an overview of what you need to develop in the Puppeteer repo.
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### Sandbox
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For easier development we provide a script to auto-generate the Angular project to test against. Simply run:
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```bash
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npm run sandbox -- --init
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```
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After that to run `@puppeteer/ng-schematics` against the Sandbox Angular project run:
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```bash
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npm run sandbox
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# or to auto-build and then run schematics
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npm run sandbox -- --build
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```
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To run the creating of single test schematic:
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```bash
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npm run sandbox:test
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```
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To create a multi project workspace use the following command
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```bash
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npm run sandbox -- --init --multi
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```
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### Unit Testing
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The schematics utilize `@angular-devkit/schematics/testing` for verifying correct file creation and `package.json` updates. To execute the test suit:
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```bash
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npm run test
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```
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## Migrating from Protractor
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### Browser
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Puppeteer has its own [`browser`](https://pptr.dev/api/puppeteer.browser) that exposes different API compared to the one exposed by Protractor.
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```ts
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import puppeteer from 'puppeteer';
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(async () => {
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const browser = await puppeteer.launch();
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it('should work', () => {
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const page = await browser.newPage();
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// Query elements
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const element = await page.$('my-component');
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// Do actions
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await element.click();
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});
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await browser.close();
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})();
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```
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### Query Selectors
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Puppeteer supports multiple types of selectors, namely, the CSS, ARIA, text, XPath and pierce selectors.
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The following table shows Puppeteer's equivalents to [Protractor By](https://www.protractortest.org/#/api?view=ProtractorBy).
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> For improved reliability and reduced flakiness try our
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> **Experimental** [Locators API](https://pptr.dev/guides/locators)
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| By | Protractor code | Puppeteer querySelector |
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| ----------------- | --------------------------------------------- | ------------------------------------------------------------ |
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| CSS (Single) | `$(by.css('<CSS>'))` | `page.$('<CSS>')` |
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| CSS (Multiple) | `$$(by.css('<CSS>'))` | `page.$$('<CSS>')` |
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| Id | `$(by.id('<ID>'))` | `page.$('#<ID>')` |
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| CssContainingText | `$(by.cssContainingText('<CSS>', '<TEXT>'))` | `page.$('<CSS> ::-p-text(<TEXT>)')` ` |
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| DeepCss | `$(by.deepCss('<CSS>'))` | `page.$(':scope >>> <CSS>')` |
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| XPath | `$(by.xpath('<XPATH>'))` | `page.$('::-p-xpath(<XPATH>)')` |
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| JS | `$(by.js('document.querySelector("<CSS>")'))` | `page.evaluateHandle(() => document.querySelector('<CSS>'))` |
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> For advanced use cases such as Protractor's `by.addLocator` you can check Puppeteer's [Custom selectors](https://pptr.dev/guides/query-selectors#custom-selectors).
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