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CONTRIBUTING.md

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Contributing

Note that we have a code of conduct. Please follow it in your interactions with this project.

Sending a Pull Request

The core team is monitoring for pull requests. We will review your pull request and either merge it, request changes to it, or close it with an explanation.

Before submitting a pull request, please:

  1. Fork the repository and create your branch.
  2. Follow the setup instructions in this file.
  3. If you’re fixing a bug or adding code that should be tested, add tests!
  4. Ensure the test suite passes.

Developing locally

First, clone the hotwired/turbo repository and install dependencies:

git clone https://github.com/hotwired/turbo.git
cd turbo
yarn install

Then create a branch for your changes:

git checkout -b <your_branch_name>

Testing

Tests are run through yarn using Web Test Runner with Playwright for browser testing. Browser and runtime configuration can be found in web-test-runner.config.mjs and playwright.config.ts.

To begin testing, install the browser drivers:

yarn playwright install --with-deps

Then build the source. Because tests are run against the compiled source (and are themselves compiled) be sure to run yarn build prior to testing. Alternatively, you can run yarn watch to build and watch for changes.

yarn build

Running the test suite

The test suite can be run with yarn, using the test commands defined in package.json. To run all tests in all configured browsers:

yarn test

To run just the unit or browser tests:

yarn test:unit
yarn test:browser

By default, tests are run in "headless" mode against all configured browsers (currently chrome and firefox). Use the --headed flag to run in normal mode. Use the --project flag to run against a particular browser.

yarn test:browser --project=firefox
yarn test:browser --project=chrome
yarn test:browser --project=chrome --headed

Running a single test

To run a single test file, pass its path as an argument. To run a particular test case, append its starting line number after a colon.

yarn test:browser src/tests/functional/drive_tests.ts
yarn test:browser src/tests/functional/drive_tests.ts:11
yarn test:browser src/tests/functional/drive_tests.ts:11 --project=chrome

Running the local web server

Because tests are running headless in browsers, debugging can be difficult. Sometimes the simplest thing to do is load the test fixtures into the browser and navigate manually. To make this easier, a local web server is included.

To run the web server, ensure the source is built and start the server with yarn:

yarn build
yarn start

The web server is available on port 9000, serving from the project root. Fixture files are accessible by path. For example, the file at src/tests/fixtures/rendering.html will be accessible at http://localhost:9000/src/tests/fixtures/rendering.html.