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
3e492ab9fe