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1# Contributing
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3## Tests
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5### Test coverage
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7For every Pull Request on GitHub and on the main branch the coverage data will get sent over to [Coveralls](https://coveralls.io/github/playwright-community/playwright-go), this is helpful for finding functions that aren't covered by tests.
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9### Running tests
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11You can use the `BROWSER` environment variable to use a different browser than Chromium for the tests and use the `HEADLESS` environment variable which is useful for debugging.
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13```
14BROWSER=chromium HEADLESS=1 go test -v --race
15```
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