mirror of
https://github.com/microsoft/playwright.git
synced 2024-12-14 21:53:35 +03:00
e97badcca8
* docs(CONTRIBUTING.md): Add build step
Without the build step, a fresh install without any previous
builds would get:
```
$ npm test
> playwright-internal@1.2.0-post test /Users/pw/code/playwright
> cross-env BROWSER=all node --unhandled-rejections=strict test/test.js
internal/modules/cjs/loader.js:1033
throw err;
^
Error: Cannot find module '../lib/rpc/server/dispatcher'
Require stack:
- /Users/pw/code/playwright/test/environments.js
- /Users/pw/code/playwright/test/test.js
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:1030:15)
at Function.Module._load (internal/modules/cjs/loader.js:899:27)
at Module.require (internal/modules/cjs/loader.js:1090:19)
at require (internal/modules/cjs/helpers.js:75:18)
at Object.<anonymous> (/Users/pw/code/playwright/test/environments.js:23:34)
at Module._compile (internal/modules/cjs/loader.js:1201:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1221:10)
at Module.load (internal/modules/cjs/loader.js:1050:32)
at Function.Module._load (internal/modules/cjs/loader.js:938:14)
at Module.require (internal/modules/cjs/loader.js:1090:19) {
code: 'MODULE_NOT_FOUND',
requireStack: [
'/Users/pw/code/playwright/test/environments.js',
'/Users/pw/code/playwright/test/test.js'
]
}
npm ERR! Test failed. See above for more details.
```
Fixes #2868.
Co-authored-by: Andrey Lushnikov <aslushnikov@gmail.com>
256 lines
8.3 KiB
Markdown
256 lines
8.3 KiB
Markdown
# Contributing
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<!-- gen:toc -->
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- [How to Contribute](#how-to-contribute)
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* [Getting Code](#getting-code)
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* [Code reviews](#code-reviews)
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* [Code Style](#code-style)
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* [API guidelines](#api-guidelines)
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* [Commit Messages](#commit-messages)
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* [Writing Documentation](#writing-documentation)
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* [Adding New Dependencies](#adding-new-dependencies)
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* [Running & Writing Tests](#running--writing-tests)
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* [Public API Coverage](#public-api-coverage)
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- [Contributor License Agreement](#contributor-license-agreement)
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* [Code of Conduct](#code-of-conduct)
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<!-- gen:stop -->
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## How to Contribute
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### Getting Code
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1. Clone this repository
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```bash
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git clone https://github.com/microsoft/playwright
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cd playwright
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```
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2. Install dependencies
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```bash
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npm install
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```
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3. Build Playwright
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```bash
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npm run build
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```
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4. Run all Playwright tests locally. For more information about tests, read [Running & Writing Tests](#running--writing-tests).
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```bash
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npm test
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```
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### Code reviews
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All submissions, including submissions by project members, require review. We
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use GitHub pull requests for this purpose. Consult
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[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
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information on using pull requests.
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### Code Style
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- Coding style is fully defined in [.eslintrc](https://github.com/microsoft/playwright/blob/master/.eslintrc.js)
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- Comments should be generally avoided. If the code would not be understood without comments, consider re-writing the code to make it self-explanatory.
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To run code linter, use:
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```bash
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npm run eslint
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```
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### API guidelines
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When authoring new API methods, consider the following:
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- Expose as little information as needed. When in doubt, don’t expose new information.
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- Methods are used in favor of getters/setters.
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- The only exception is namespaces, e.g. `page.keyboard` and `page.coverage`
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- All string literals must be small case. This includes event names and option values.
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- Avoid adding "sugar" API (API that is trivially implementable in user-space) unless they're **very** common.
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### Commit Messages
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Commit messages should follow the Semantic Commit Messages format:
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```
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label(namespace): title
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description
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footer
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```
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1. *label* is one of the following:
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- `fix` - playwright bug fixes.
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- `feat` - playwright features.
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- `docs` - changes to docs, e.g. `docs(api.md): ..` to change documentation.
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- `test` - changes to playwright tests infrastructure.
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- `devops` - build-related work, e.g. CI related patches and general changes to the browser build infrastructure
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- `chore` - everything that doesn't fall under previous categories
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2. *namespace* is put in parenthesis after label and is optional. Must be lowercase.
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3. *title* is a brief summary of changes.
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4. *description* is **optional**, new-line separated from title and is in present tense.
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5. *footer* is **optional**, new-line separated from *description* and contains "fixes" / "references" attribution to github issues.
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Example:
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```
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fix(firefox): make sure session cookies work
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This patch fixes session cookies in firefox browser.
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Fixes #123, fixes #234
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```
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### Writing Documentation
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All public API should have a descriptive entry in [`docs/api.md`](https://github.com/microsoft/playwright/blob/master/docs/api.md). There's a [documentation linter](https://github.com/microsoft/playwright/tree/master/utils/doclint) which makes sure documentation is aligned with the codebase.
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To run the documentation linter, use:
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```bash
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npm run doc
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```
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### Adding New Dependencies
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For all dependencies (both installation and development):
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- **Do not add** a dependency if the desired functionality is easily implementable.
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- If adding a dependency, it should be well-maintained and trustworthy.
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A barrier for introducing new installation dependencies is especially high:
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- **Do not add** installation dependency unless it's critical to project success.
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### Running & Writing Tests
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- Every feature should be accompanied by a test.
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- Every public api event/method should be accompanied by a test.
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- Tests should be *hermetic*. Tests should not depend on external services.
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- Tests should work on all three platforms: Mac, Linux and Win. This is especially important for screenshot tests.
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Playwright tests are located in [`test/test.js`](https://github.com/microsoft/playwright/blob/master/test/test.js)
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and are written with a [TestRunner](https://github.com/microsoft/playwright/tree/master/utils/testrunner) framework.
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These are integration tests, making sure public API methods and events work as expected.
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- To run all tests:
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```bash
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npm run test
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```
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- To run all tests in Chromium
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```bash
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npm run ctest # also `ftest` for firefox and `wtest` for WebKit
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```
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- To run tests in parallel, use `-j` flag:
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```bash
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npm run wtest -- -j 4
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```
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- To run tests in "verbose" mode or to stop testrunner on first failure:
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```bash
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npm run ftest -- --verbose
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npm run ftest -- --break-on-failure
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```
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- To run a specific test, substitute the `it` with `fit` (mnemonic rule: '*focus it*'):
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```js
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...
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// Using "fit" to run specific test
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fit('should work', async ({server, page}) => {
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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 `xit` (mnemonic rule: '*cross it*'):
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```js
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...
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// Using "xit" to skip specific test
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xit('should work', async ({server, page}) => {
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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 tests in non-headless (headful) mode:
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```bash
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HEADLESS=false npm run ctest
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```
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- To run tests with custom browser executable, specify `CRPATH`, `WKPATH` or `FFPATH` env variable that points to browser executable:
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```bash
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CRPATH=<path-to-executable> npm run ctest
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```
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- To run tests in slow-mode:
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```bash
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HEADLESS=false SLOW_MO=500 npm run wtest
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```
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- To debug a test, "focus" a test first and then run:
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```bash
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BROWSER=chromium node --inspect-brk test/test.js
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```
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- When should a test be marked with `skip` or `fail`?
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- **`skip(condition)`**: This test *should ***never*** work* for `condition`
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where `condition` is usually a certain browser like `FFOX` (for Firefox),
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`WEBKIT` (for WebKit), and `CHROMIUM` (for Chromium).
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For example, the [alt-click downloads test](https://github.com/microsoft/playwright/blob/471ccc72d3f0847caa36f629b394a028c7750d93/test/download.spec.js#L86) is marked
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with `skip(FFOX)` since an alt-click in Firefox will not produce a download
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even if a person was driving the browser.
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- **`fail(condition)`**: This test *should ***eventually*** work* for `condition`
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where `condition` is usually a certain browser like `FFOX` (for Firefox),
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`WEBKIT` (for WebKit), and `CHROMIUM` (for Chromium).
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For example, the [alt-click downloads test](https://github.com/microsoft/playwright/blob/471ccc72d3f0847caa36f629b394a028c7750d93/test/download.spec.js#L86) is marked
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with `fail(CHROMIUM || WEBKIT)` since Playwright performing these actions
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currently diverges from what a user would experience driving a Chromium or
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WebKit.
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### Public API Coverage
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Every public API method or event should be called at least once in tests. To ensure this, there's a `coverage` command which tracks calls to public API and reports back if some methods/events were not called.
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Run all tests for all browsers with coverage enabled:
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```bash
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npm run coverage
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```
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There are also per-browser commands:" `npm run ccoverage`, `npm run fcoverage` and `npm run wcoverage`.
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## Contributor License Agreement
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This project welcomes contributions and suggestions. Most contributions require you to agree to a
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Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
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the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.
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When you submit a pull request, a CLA bot will automatically determine whether you need to provide
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a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions
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provided by the bot. You will only need to do this once across all repos using our CLA.
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### Code of Conduct
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This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
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For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
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contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.
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