Zhen Zhang edited this page Jul 30, 2016 · 17 revisions
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Servo has a test suite which runs on every reviewed pull request, via bors-servo and the buildbot. It uses Mozilla's Mach system to run the tests.

You can run the test suite yourself through these ./mach commands:

  • ./mach test: Runs all the Servo tests.
  • ./mach test-unit: Runs unit tests (functions tagged with #[test]) inside Servo and its dependencies. May also run ref or content tests depending on your platform.
  • ./mach test-wpt: Runs the web platform tests on Servo.
  • ./mach test-css Runs a subset of the CSS WG tests (mostly reftests) on Servo. Uses the same harnesses as the web-platform-tests and the further information there still applies.

Writing test

  • Write wpt/css tests
  • Write unit tests: These are common Rust programs under tests/unit, and is organized to reflect the components tree. You can follow the existing structure and Rust testing guide.

Assign a Temporary Hostfile for Testing

In some tests (e.g. wpt tests), you need to use a hostfile to translate testing domain names to real IPs. For example, translating wpt1.testserver.com to But you may not have the permission to change the system hostfile in a shared server. Instead, you can assign a temporary hostfile using the HOST_FILE environment variable.

First, create a hostfile, say /tmp/hostfile.txt, in the following format ip<single space>hostname<new line>. For example: wpt1.testserver.com wpt2.testserver.com

Then, set the HOST_FILE environment variable as the absolute path to the hostfile.

export HOST_FILE=/tmp/hostfile.txt

Now, if you open http://wpt1.testserver.com in servo, you will go to directly.