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Gaia is a HTML5-based Phone UI for the Boot 2 Gecko Project. NOTE: For details of what branches are used for what releases, see
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Gaia is Mozilla's Phone UX for the Boot to Gecko (B2G) project.

Boot to Gecko aims to create a complete, standalone operating system for the open web.

You can read more about B2G here:

follow us on twitter: @Boot2Gecko

join the Gaia mailing list:

and talk to us on IRC:

#gaia on

See INSTALL file in B2G repository for instructions on building and running B2G. To try out Gaia on desktop, see


Unit Tests

Unit tests for an app go in apps/<APP>/test/unit/.

To run all the unit tests with B2G Desktop:

  1. Run DEBUG=1 make
  2. Run make test-agent-server &
  3. Run B2G Desktop and open the Test Agent app
  4. Run make test-agent-test

    or make test-agent-test APP=<APP> to run unit tests for a specific app

More importantly, you can use test-agent-server to watch the files on the filesystem and execute relevant tests when they change:

  1. Run DEBUG=1 make
  2. Run make test-agent-server &
  3. Run B2G Desktop and open the Test Agent app
  4. Edit files and when you save them, glance at the console with test-agent-server running

Note: If you add new files, you will need to restart test-agent-server.

For more details on writing tests, see:

Integration Tests

Integration tests for an app are located in apps/<APP>/test/integration/.


  1. adb
  2. FirefoxOS Device / Emulator / B2G Desktop

To run integration tests:

  1. In your gaia/ directory, run make to build the profile
  2. Run B2G Desktop

    or forward port 2828 from your device / emulator using adb forward tcp:2828 tcp:2828

  3. Run make test-integration from the gaia/ directory

    or make test-integration APP=<APP> to run unit tests for a specified app

    or make test-integration TESTS=<PATH/TO/TESTFILE.js> to run unit tests in a specific file

    or make test-integration REPORTER=<REPORTER> to run integration tests with the specified reporter, for example XUnit

    or make test-integration TESTVARS=<PATH/TO/TESTVARS.json> to run tests with variables in the testvars file (this defaults to testvars.json)

Note: If you're using a FirefoxOS Device, it must have been flashed with a build with marionette enabled. If it doesn't have marionette enabled, then running make test-integration will time out.

The testvars file is a JSON file that maps app names to objects holding key/values as required by that app's integration tests. See that app's integration test code and/or README for which key/values are required.

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