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This folder contains the web platform tests, CSS WG tests, and the code required to integrate them with Servo. To learn how to write tests, go here.

Contents

In particular, this folder contains:

  • config.ini: some configuration for the web-platform-tests.
  • include.ini: the subset of web-platform-tests we currently run.
  • config_css.ini: some configuration for the CSSWG tests.
  • include_css.ini: the subset of the CSSWG tests we currently run.
  • run_wpt.py: glue code to run the web-platform-tests in Servo.
  • run_css.py: glue code to run the CSSWG tests in Servo.
  • run.py: common code used by run_wpt.py and run_css.py.
  • web-platform-tests: copy of the web-platform-tests.
  • metadata: expected failures for the web-platform-tests we run.
  • css-tests: copy of the built CSSWG tests.
  • metadata-css: expected failures for the CSSWG tests we run.
  • mozilla: web-platform-tests that cannot be upstreamed.

Running the tests

The simplest way to run the web-platform-tests in Servo is ./mach test-wpt in the root directory. This will run the subset of JavaScript tests defined in include.ini and log the output to stdout.

Similarly the CSSWG tests can be run using ./mach test-css.

A subset of tests may be run by providing positional arguments to the mach command, either as filesystem paths or as test urls e.g.

./mach test-wpt tests/wpt/web-platform-tests/dom/historical.html

to run the dom/historical.html test, or

./mach test-wpt dom

to run all the DOM tests.

There are also a large number of command line options accepted by the test harness; these are documented by running with --help.

Running all tests

Running all the WPT tests with debug mode results in a lot of timeout. If one wants to run all the tests, build with mach build -r and test with mach test-wpt --release

Running the tests without mach

When avoiding mach for some reason, one can run either run_wpt.py ir run_css.py directly. However, this requires that all the dependencies for wptrunner are avaliable in the current python environment.

Running the tests manually

It can be useful to run a test without the interference of the test runner, for example when using a debugger such as gdb. In that case, start the server by first adding the following to the system's hosts file:

127.0.0.1   www.web-platform.test
127.0.0.1   www1.web-platform.test
127.0.0.1   www2.web-platform.test
127.0.0.1   web-platform.test
127.0.0.1   xn--n8j6ds53lwwkrqhv28a.web-platform.test
127.0.0.1   xn--lve-6lad.web-platform.test

and then running python serve from tests/wpt/web-platform-tests. Then navigate Servo to http://web-platform.test:8000/path/to/test.

Running the tests in Firefox

When working with tests, you may want to compare Servo's result with Firefox. You can supply --product firefox along with the path to a Firefox binary (as well as few more odds and ends) to run tests in Firefox from your Servo checkout:

GECKO="$HOME/projects/mozilla/gecko"
GECKO_BINS="$GECKO/obj-firefox-release-artifact/dist/Nightly.app/Contents/MacOS"
./mach test-wpt dom --product firefox --binary $GECKO_BINS/firefox --certutil-binary $GECKO_BINS/certutil --prefs-root $GECKO/testing/profiles

Updating test expectations

When fixing a bug that causes the result of a test to change, the expected results for that test need to be changed. This can be done manually, by editing the .ini file under the metadata folder that corresponds to the test. In this case, remove the references to tests whose expectation is now PASS, and remove .ini files that no longer contain any expectations.

When a larger number of changes is required, this process can be automated. This first requires saving the raw, unformatted log from a test run, for example by running ./mach test-wpt --log-raw /tmp/servo.log. Once the log is saved, run from the root directory:

./mach update-wpt /tmp/servo.log

For CSSWG tests a similar prcedure works, with ./mach test-css and ./mach update-css.

Writing new tests

The simplest way to create a new test is to use the following command:

./mach create-wpt tests/wpt/path/to/new/test.html

This will create test.html in the appropriate directory using the WPT template for JavaScript tests. Tests are written using testharness.js. Documentation can be found here. To create a new reference test instead, use the following:

./mach create-wpt --reftest tests/wpt/path/to/new/reftest.html --reference tests/wpt/path/to/reference.html

reference.html will be created if it does not exist, and reftest.html will be created using the WPT reftest template. To know more about reftests, check this. These new tests can then be run in the following manner like any other WPT test:

./mach test-wpt tests/wpt/path/to/new/test.html
./mach test-wpt tests/wpt/path/to/new/reftest.html

Editing tests

web-platform-tests may be edited in-place and the changes committed to the servo tree. These changes will be upstreamed when the tests are next synced.

For CSS tests this kind of in-place update is not possible because the tests have a build step before they are pulled into the servo repository. Therefore corrections must be submitted directly to the source repository.

Updating the upstream tests

In order to update the tests from upstream use the same mach update commands. e.g. to update the web-platform-tests:

./mach update-wpt --sync
./mach test-wpt --log-raw=update.log
./mach update-wpt update.log

This should create two commits in your servo repository with the updated tests and updated metadata. The same process works for the CSSWG tests, using the update-css and test-css mach commands.

Updating the test harness

The easiest way to update the test harness is using git:

cd tests/wpt/harness
git init .
git remote add origin https://github.com/w3c/wptrunner
git fetch origin
git checkout -f origin/master
cd ../../..

At this point you should commit the updated files in the servo git repository.

Servo-specific tests

The mozilla directory contains tests that cannot be upstreamed for some reason (e.g. because they depend on Servo-specific APIs), as well as some legacy tests that should be upstreamed at some point. When run they are mounted on the server under /_mozilla/.

Analyzing reftest results

Reftest results can be analyzed from a raw log file. To generate this run with the --log-raw option e.g.

./mach test-css --log-raw css.log

This file can then be fed into the reftest analyzer which will show all failing tests (not just those with unexpected results). Note that this ingests logs in a different format to original version of the tool written for gecko reftests.

The reftest analyzer allows pixel-level comparison of the test and reference screenshots. Tests that both fail and have an unexpected result are marked with a !.

Updating the WPT manifest

MANIFEST.json can be regenerated automatically with the mach command update-manifest e.g.

./mach update-manifest

This is equivalent to running

./mach test-wpt --manifest-update SKIP_TESTS