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docs(testing): add playwright overview page (#18357)
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docs/generated/packages/playwright/documents/overview.md
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Playwright is a modern web test runner. With included features such as: | ||
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- Cross browser support, including mobile browsers | ||
- Multi tab, origin, and user support | ||
- Automatic waiting | ||
- Test generation | ||
- Screenshots and videos | ||
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## Setting Up Playwright | ||
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If the `@nx/playwright` package is not installed, install the version that matches your `nx` package version. | ||
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{% tabs %} | ||
{% tab label="npm" %} | ||
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```shell | ||
npm install --save-dev @nx/playwright | ||
``` | ||
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{% /tab %} | ||
{% tab label="yarn" %} | ||
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```shell | ||
yarn add --dev @nx/playwright | ||
``` | ||
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{% /tab %} | ||
{% tab label="pnpm" %} | ||
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```shell | ||
pnpm i -D @nx/playwright | ||
``` | ||
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{% /tab %} | ||
{% /tabs %} | ||
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## E2E Testing | ||
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By default, when creating a new frontend application, Nx will prompt for which e2e test runner to use. Select `playwright` or pass in the arg `--e2eTestRunner=playwright` | ||
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```shell | ||
nx g @nx/web:app frontend --e2eTestRunner=playwright | ||
``` | ||
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### Add Playwright e2e to an existing project | ||
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To generate an E2E project for an existing project, run the following generator | ||
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```shell | ||
nx g @nx/playwright:configuration --project=your-app-name --project=your-app-name | ||
``` | ||
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Optionally, you can use the `--webServerCommand` and `--webServerAddress` option, to auto setup the [web server option](https://playwright.dev/docs/test-webserver) in the playwright config | ||
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```shell | ||
nx g @nx/playwright:configuration --project=your-app-name --webServerCommand="npx serve your-project-name" --webServerAddress="http://localhost:4200" | ||
``` | ||
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### Testing Applications | ||
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Run `nx e2e <your-app-name>` to execute e2e tests with Playwright | ||
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{% callout type="note" title="Selecting Specific Specs" %} | ||
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You can use the `--grep/-g` flag to glob for test files. | ||
You can use the `--grepInvert/-gv` flag to glob for files to _not_ run. | ||
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```bash | ||
# run the tests in the feat-a/ directory | ||
nx e2e frontend-e2e --grep="**feat-a/**" | ||
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# run everything except feat-a/ directory | ||
nx e2e frontend-e2e --grepInvert=**feat-a/** | ||
``` | ||
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{% /callout %} | ||
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By default, Playwright will run in headless mode. You will have the result of all the tests and errors (if any) in your | ||
terminal. Test output such as reports, screenshots and videos, will be accessible in `dist/.playwright/apps/<your-app-name>/`. This can be configured with the `outputDir` configuration options. | ||
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{% callout type="note" title="Output Caching" %} | ||
If changing the output directory or report output, make sure to update the [target outputs](/concepts/how-caching-works#what-is-cached) so the artifacts are correctly cached | ||
{% /callout %} | ||
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### Watching for Changes | ||
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With, `nx e2e frontend-e2e --ui` Playwright will start in headed mode where you can see your application being tested. | ||
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From, there you can toggle on the watch icon which will rerun the tests when the spec file updates. | ||
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```shell | ||
nx e2e <your-app-name> --ui | ||
``` | ||
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You can also use `--headed` flag to run Playwright where the browser can be seen without using the [Playwright UI](https://playwright.dev/docs/test-ui-mode) | ||
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### Specifying a Base Url | ||
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The `baseURL` property within the Playwright configuration can control where the tests visit by default. | ||
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```ts | ||
import { defineConfig } from '@playwright/test'; | ||
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export default defineConfig({ | ||
// Rest of your config... | ||
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// Run your local dev server before starting the tests | ||
webServer: { | ||
command: 'npx serve <your-app-name>', | ||
url: 'http://localhost:4200', | ||
reuseExistingServer: !process.env.CI, | ||
}, | ||
use: { | ||
baseURL: 'http://localhost:4200', // url playwright visits with `await page.goto('/')`; | ||
}, | ||
}); | ||
``` | ||
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In order to set different `baseURL` values for different environments you can pass them via the [environment variables and nx configurations](/recipes/tips-n-tricks/define-environment-variables) or optionally via setting them per the environment they are needed in such as `CI` | ||
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```ts | ||
import { defineConfig } from '@playwright/test'; | ||
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const baseUrl = | ||
process.env.BASE_URL ?? process.env.CI | ||
? 'https://some-staging-url.example.com' | ||
: 'http://localhost:4200'; | ||
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export default defineConfig({ | ||
// Rest of your config... | ||
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// Run your local dev server before starting the tests | ||
webServer: { | ||
command: 'npx serve <your-app-name>', | ||
url: baseUrl, | ||
reuseExistingServer: !process.env.CI, | ||
}, | ||
use: { | ||
baseURL: baseUrl, // url playwright visits with `await page.goto('/')`; | ||
}, | ||
}); | ||
``` | ||
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By default Nx, provides a `nxE2EPreset` with predefined configuration for Playwright. | ||
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```ts | ||
import { defineConfig } from '@playwright/test'; | ||
import { nxE2EPreset } from '@nx/playwright/preset'; | ||
import { workspaceRoot } from '@nx/devkit'; | ||
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// For CI, you may want to set BASE_URL to the deployed application. | ||
const baseURL = process.env['BASE_URL'] || 'http://localhost:4200'; | ||
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/** | ||
* Read environment variables from file. | ||
* https://github.com/motdotla/dotenv | ||
*/ | ||
// require('dotenv').config(); | ||
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/** | ||
* See https://playwright.dev/docs/test-configuration. | ||
*/ | ||
export default defineConfig({ | ||
...nxE2EPreset(__filename, { testDir: './e2e' }), | ||
/* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */ | ||
use: { | ||
baseURL, | ||
/* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */ | ||
trace: 'on-first-retry', | ||
}, | ||
/* Run your local dev server before starting the tests */ | ||
webServer: { | ||
command: 'npx nx serve <your-app-name>', | ||
url: baseURL, | ||
reuseExistingServer: !process.env.CI, | ||
cwd: workspaceRoot, | ||
}, | ||
}); | ||
``` | ||
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This preset sets up the `outputDir` and [HTML reporter](https://playwright.dev/docs/test-reporters#html-reporter) to output in `dist/.playwright/<path-to-project-root>` and sets up chromium, firefox, webkit browsers to be used a browser targets. If you want to use mobile and/or branded browsers you can pass those options into the preset function | ||
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```ts | ||
export default defineConfig({ | ||
...nxE2EPreset(__filename, { | ||
testDir: './e2e', | ||
includeMobileBrowsers: true, // includes mobile Chrome and Safari | ||
includeBrandedBrowsers: true, // includes Google Chrome and Microsoft Edge | ||
}), | ||
// other settings | ||
}); | ||
``` | ||
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If you want to override any settings within the `nxE2EPreset`, You can define them after the preset like so | ||
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```ts | ||
const config = nxE2EPreset(__filename, { | ||
testDir: './e2e', | ||
includeMobileBrowsers: true, // includes mobile Chrome and Safari | ||
includeBrandedBrowsers: true, // includes Google Chrome and Microsoft Edge | ||
}); | ||
export default defineConfig({ | ||
...config | ||
retries: 3, | ||
reporters: [...config.reporters, /* other reporter settings */], | ||
}); | ||
``` | ||
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See the [Playwright configuration docs](https://playwright.dev/docs/test-configuration) for more options for Playwright. |
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