subscription.html - mozsearch

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This WPT test may be referenced by the following Test IDs:
- /infrastructure/webdriver/bidi/subscription.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Can subscribe and receive WebDriver BiDi events</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/resources/testdriver.js?feature=bidi"></script>

<script src="/resources/testdriver-vendor.js"></script>

<script>

    promise_test(async () => {

        const some_message = "SOME MESSAGE";

        // Subscribe to `log.entryAdded` BiDi events. This will not add a listener to the page.

        await test_driver.bidi.log.entry_added.subscribe();

        // Add a listener for the log.entryAdded event. This will not subscribe to the event, so the subscription is

        // required before. The cleanup is done automatically after the test is finished.

        const log_entry_promise = test_driver.bidi.log.entry_added.once();

        // Emit a console.log message.

        // Note: Lint rule is disabled in `lint.ignore` file.

        console.log(some_message);

        // Wait for the log.entryAdded event to be received.

        const event = await log_entry_promise;

        // Assert the log.entryAdded event has the expected message.

        assert_equals(event.args.length, 1);

        const event_message = event.args[0];

        assert_equals(event_message.value, some_message);

    }, "Assert testdriver can subscribe and receive events");

</script>