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This patch adds Mochia, a simple Mocha-like test interface that wraps add_task. It allows for composable and shareable setup and teardown functions across test suites and provides a more familiar interface than add_task et al. that may make it easier for newcomers to Firefox to write tests. Differential Revision: https://phabricator.services.mozilla.com/D244526
See https://developer.mozilla.org/en/docs/Mochitest for detailed information on running and writing mochitests.