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diff --git a/remote/doc/Testing.md b/remote/doc/Testing.md new file mode 100644 index 0000000000..358acb85d2 --- /dev/null +++ b/remote/doc/Testing.md @@ -0,0 +1,140 @@ +Testing +======= + +The remote agent has unit- and functional tests located under +`remote/test/{unit,browser}`. + +You may run all the tests under a particular subfolder like this: + + % ./mach test remote + + +Unit tests +---------- + +Because tests are run in parallel and [xpcshell] itself is quite +chatty, it can sometimes be useful to run the tests in sequence: + + % ./mach xpcshell-test --sequential remote/test/unit/test_DomainCache.js + +The unit tests will appear as part of the `X` (for _xpcshell_) jobs +on Treeherder. + +[xpcshell]: https://developer.mozilla.org/en-US/docs/Mozilla/QA/Writing_xpcshell-based_unit_tests + + +Browser chrome tests +-------------------- + +We also have a set of functional [browser chrome] tests located +under _remote/test/browser_: + + % ./mach mochitest remote/test/browser/browser_cdp.js + +The functional tests will appear under the `M` (for _mochitest_) +category in the `remote` jobs on Treeherder. + +As the functional tests will sporadically pop up new Firefox +application windows, a helpful tip is to run them in [headless +mode]: + + % ./mach mochitest --headless remote/test/browser + +The `--headless` flag is equivalent to setting the `MOZ_HEADLESS` +environment variable. You can additionally use `MOZ_HEADLESS_WIDTH` +and `MOZ_HEADLESS_HEIGHT` to control the dimensions of the virtual +display. + +The `add_task()` function used for writing [asynchronous tests] is +replaced to provide some additional test setup and teardown useful +for writing tests against the remote agent and the targets. + +Before the task is run, the `nsIRemoteAgent` listener is started +and a [CDP client] is connected. You will use this CDP client for +interacting with the agent just as any other CDP client would. + +Also target discovery is getting enabled, which means that targetCreated, +targetDestroyed, and targetInfoChanged events will be received by the client. + +The task function you provide in your test will be called with the +three arguments `client`, `CDP`, and `tab`: + + - `client` is the connection to the `nsIRemoteAgent` listener, + and it provides the a client CDP API + + - `CDP` is the CDP client class + + - `tab` is a fresh tab opened for each new test, and is automatically + removed after the test has run + +This is what it looks like all put together: + + add_task(async function testName({client, CDP, tab}) { + // test tab is implicitly created for us + info("Current URL: " + tab.linkedBrowser.currentURI.spec); + + // manually connect to a specific target + const { mainProcessTarget } = RemoteAgent.targets; + const target = mainProcessTarget.wsDebuggerURL; + const client = await CDP({ target }); + + // retrieve the Browser domain, and call getVersion() on it + const { Browser } = client; + const version = await Browser.getVersion(); + + await client.close(); + + // tab is implicitly removed + }); + +You can control the tab creation behaviour with the `createTab` +option to `add_task(taskFunction, options)`: + + add_task(async function testName({client}) { + // tab is not implicitly created + }, { createTab: false }); + +If you want to write an asynchronous test _without_ this implicit +setup you may instead use `add_plain_task()`, which works exactly like the +original `add_task()`. + +[browser chrome]: https://developer.mozilla.org/en-US/docs/Mozilla/Browser_chrome_tests +[headless mode]: https://developer.mozilla.org/en-US/Firefox/Headless_mode +[asynchronous tests]: https://developer.mozilla.org/en-US/docs/Mozilla/Browser_chrome_tests#Test_functions +[CDP client]: https://github.com/cyrus-and/chrome-remote-interface + + +Puppeteer tests +--------------- + +In addition to our own Firefox-specific tests, we run the upstream +[Puppeteer test suite] against our implementation to [track progress] +towards achieving full [Puppeteer support] in Firefox. The tests are written +in the behaviour-driven testing framework [Mocha]. + +Check the upstream [Puppeteer test suite] documentation for instructions on +how to skip tests, run only one test or a subsuite of tests. + +Puppeteer tests are vendored under _remote/test/puppeteer/_ and are +run locally like this: + + % ./mach puppeteer-test + +You can also run them against Chrome as: + + % ./mach puppeteer-test --product=chrome --subset + +`--subset` disables a check for missing or skipped tests in our log parsing. +This check is typically not relevant when running against Chrome. + +To schedule the tests on try, look for `source-test-remote-puppeteer` in +`./mach try fuzzy`. On try they appear under the `remote(pup)` symbol. + +Test expectation metadata is collected in _remote/puppeteer-expected.json_ +via log parsing and a custom Mocha reporter under +_remote/test/puppeteer/json-mocha-reporter.js_ + +[Puppeteer test suite]: https://github.com/puppeteer/puppeteer/blob/master/test/README.md +[track progress]: https://puppeteer.github.io/ispuppeteerfirefoxready/ +[Puppeteer support]: https://bugzilla.mozilla.org/show_bug.cgi?id=puppeteer +[Mocha]: https://mochajs.org/ |