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133 lines
3.6 KiB
Markdown
133 lines
3.6 KiB
Markdown
## Web Platform Test
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Deno uses a custom test runner for Web Platform Tests. It can be found at
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`./tools/wpt.ts`.
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### Running tests
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> If you are on Windows, or your system does not support shebangs, prefix all
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> `./tools/wpt.ts` commands with
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> `deno run --unstable --allow-write --allow-read --allow-net --allow-env --allow-run`.
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Before attempting to run WPT tests for the first time, please run the WPT setup.
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You must also run this command every time the `./test_util/wpt` submodule is
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updated:
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```shell
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./tools/wpt.ts setup
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```
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To run all available web platform tests, run the following command:
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```shell
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./tools/wpt.ts run
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# You can also filter which test files to run by specifying filters:
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./tools/wpt.ts run -- streams/piping/general hr-time
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```
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The test runner will run each web platform test and record its status (failed or
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ok). It will then compare this output to the expected output of each test as
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specified in the `./tools/wpt/expectation.json` file. This file is a nested JSON
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structure that mirrors the `./test_utils/wpt` directory. It describes for each
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test file, if it should pass as a whole (all tests pass, `true`), if it should
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fail as a whole (test runner encounters an exception outside of a test or all
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tests fail, `false`), or which tests it expects to fail (a string array of test
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case names).
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### Updating enabled tests or expectations
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You can update the `./tools/wpt/expectation.json` file manually by changing the
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value of each of the test file entries in the JSON structure. The alternative
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and preferred option is to have the WPT runner run all, or a filtered subset of
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tests, and then automatically update the `expectation.json` file to match the
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current reality. You can do this with the `./wpt.ts update` command. Example:
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```shell
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./tools/wpt.ts update -- hr-time
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```
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After running this command the `expectation.json` file will match the current
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output of all the tests that were run. This means that running `wpt.ts run`
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right after a `wpt.ts update` should always pass.
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### Subcommands
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#### `setup`
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Validate that your environment is configured correctly, or help you configure
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it.
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This will check that the python3 (or `python.exe` on Windows) is actually
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Python 3.
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You can specify the following flags to customize bahaviour:
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```
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--rebuild
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Rebuild the manifest instead of downloading. This can take up to 3 minutes.
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--auto-config
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Automatically configure /etc/hosts if it is not configured (no prompt will be shown).
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```
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#### `run`
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Run all tests like specified in `expectation.json`.
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You can specify the following flags to customize behaviour:
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```
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--release
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Use the ./target/release/deno binary instead of ./target/debug/deno
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--quiet
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Disable printing of `ok` test cases.
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--json=<file>
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Output the test results as JSON to the file specified.
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```
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You can also specify exactly which tests to run by specifying one of more
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filters after a `--`:
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```
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./tools/wpt.ts run -- hr-time streams/piping/general
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```
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### `update`
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Update the `expectation.json` to match the current reality.
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You can specify the following flags to customize behaviour:
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```
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--release
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Use the ./target/release/deno binary instead of ./target/debug/deno
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--quiet
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Disable printing of `ok` test cases.
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--json=<file>
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Output the test results as JSON to the file specified.
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```
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You can also specify exactly which tests to run by specifying one of more
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filters after a `--`:
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```
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./tools/wpt.ts update -- hr-time streams/piping/general
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```
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### FAQ
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#### Upgrading the wpt submodule:
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```shell
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cd test_util/wpt/
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# Rebase to retain our modifications
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git rebase origin/master
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git push denoland
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```
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All contributors will need to rerun `./tools/wpt.ts setup` after this.
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