1668d47b2f
See commits for details. Closes #1837, #5880, #7822, #8101, #8821, #9367, #9382, #9378, #4731
80 lines
2.8 KiB
Markdown
80 lines
2.8 KiB
Markdown
# Puppeteer tests
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Unit tests in Puppeteer are written using [Mocha] as the test runner and [Expect] as the assertions library.
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## Test state
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We have some common setup that runs before each test and is defined in `mocha-utils.js`.
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You can use the `getTestState` function to read state. It exposes the following that you can use in your tests. These will be reset/tidied between tests automatically for you:
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- `puppeteer`: an instance of the Puppeteer library. This is exactly what you'd get if you ran `require('puppeteer')`.
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- `puppeteerPath`: the path to the root source file for Puppeteer.
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- `defaultBrowserOptions`: the default options the Puppeteer browser is launched from in test mode, so tests can use them and override if required.
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- `server`: a dummy test server instance (see `packages/testserver` for more).
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- `httpsServer`: a dummy test server HTTPS instance (see `packages/testserver` for more).
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- `isFirefox`: true if running in Firefox.
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- `isChrome`: true if running Chromium.
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- `isHeadless`: true if the test is in headless mode.
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If your test needs a browser instance, you can use the `setupTestBrowserHooks()` function which will automatically configure a browser that will be cleaned between each test suite run. You access this via `getTestState()`.
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If your test needs a Puppeteer page and context, you can use the `setupTestPageAndContextHooks()` function which will configure these. You can access `page` and `context` from `getTestState()` once you have done this.
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The best place to look is an existing test to see how they use the helpers.
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## Skipping tests in specific conditions
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To skip tests edit the [TestExpecations](https://github.com/puppeteer/puppeteer/blob/main/test/TestExpectations.json) file. See [test runner documentation](https://github.com/puppeteer/puppeteer/tree/main/tools/mochaRunner) for more details.
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## Running tests
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- To run all tests applicable for your platform:
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```bash
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npm test
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```
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- **Important**: don't forget to first build the code if you're testing local changes:
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```bash
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npm run build && npm test
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```
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- To run a specific test, substitute the `it` with `it.only`:
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```ts
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...
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it.only('should work', async function() {
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const {server, page} = getTestState();
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const response = await page.goto(server.EMPTY_PAGE);
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expect(response.ok).toBe(true);
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});
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```
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- To disable a specific test, substitute the `it` with `it.skip`:
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```ts
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...
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it.skip('should work', async function({server, page}) {
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const {server, page} = getTestState();
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const response = await page.goto(server.EMPTY_PAGE);
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expect(response.ok).toBe(true);
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});
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```
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- To run Chrome headful tests:
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```bash
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npm run test:chrome:headful
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```
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- To run tests with custom browser executable:
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```bash
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BINARY=<path-to-executable> npm run test:chrome:headless # Or npm run test:firefox
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```
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[mocha]: https://mochajs.org/
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[expect]: https://www.npmjs.com/package/expect
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