mozilla-central/dom/media/mediacontrol/tests/browser/browser_media_control_playback_state.js (file symbol)

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Test Info: Warnings

const PAGE_NON_AUTOPLAY =
const testVideoId = "video";
add_task(async function setupTestingPref() {
await SpecialPowers.pushPrefEnv({
set: [["media.mediacontrol.testingevents.enabled", true]],
});
});
/**
* This test is used to check the actual playback state [1] of the main media
* controller. The declared playback state is the playback state from the active
* media session, and the guessed playback state is determined by the media's
* playback state. Both the declared playback and the guessed playback state
* would be used to decide the final result of the actual playback state.
*
*/
add_task(async function testDefaultPlaybackStateBeforeAnyMediaStart() {
info(`open media page`);
const tab = await createLoadedTabWrapper(PAGE_NON_AUTOPLAY, {
needCheck: false,
});
info(`before media starts, playback state should be 'none'`);
await isActualPlaybackStateEqualTo(tab, "none");
info(`remove tab`);
await tab.close();
});
add_task(async function testGuessedPlaybackState() {
info(`open media page`);
const tab = await createLoadedTabWrapper(PAGE_NON_AUTOPLAY);
info(
`Now declared='none', guessed='playing', so actual playback state should be 'playing'`
);
await setGuessedPlaybackState(tab, "playing");
await isActualPlaybackStateEqualTo(tab, "playing");
info(
`Now declared='none', guessed='paused', so actual playback state should be 'paused'`
);
await setGuessedPlaybackState(tab, "paused");
await isActualPlaybackStateEqualTo(tab, "paused");
info(`remove tab`);
await tab.close();
});
add_task(async function testBothGuessedAndDeclaredPlaybackState() {
info(`open media page`);
const tab = await createLoadedTabWrapper(PAGE_NON_AUTOPLAY);
info(
`Now declared='paused', guessed='playing', so actual playback state should be 'playing'`
);
await setDeclaredPlaybackState(tab, "paused");
await setGuessedPlaybackState(tab, "playing");
await isActualPlaybackStateEqualTo(tab, "playing");
info(
`Now declared='paused', guessed='paused', so actual playback state should be 'paused'`
);
await setGuessedPlaybackState(tab, "paused");
await isActualPlaybackStateEqualTo(tab, "paused");
info(
`Now declared='playing', guessed='paused', so actual playback state should be 'playing'`
);
await setDeclaredPlaybackState(tab, "playing");
await isActualPlaybackStateEqualTo(tab, "playing");
info(`remove tab`);
await tab.close();
});
/**
* The following are helper functions.
*/
function setGuessedPlaybackState(tab, state) {
if (state == "playing") {
return playMedia(tab, testVideoId);
} else if (state == "paused") {
return pauseMedia(tab, testVideoId);
}
// We won't set the state `stopped`, which would only happen if no any media
// has ever been started in the page.
ok(false, `should only set 'playing' or 'paused' state`);
return Promise.resolve();
}
async function isActualPlaybackStateEqualTo(tab, expectedState) {
const controller = tab.linkedBrowser.browsingContext.mediaController;
if (controller.playbackState != expectedState) {
await new Promise(r => (controller.onplaybackstatechange = r));
}
is(
controller.playbackState,
expectedState,
`current state '${controller.playbackState}' is equal to '${expectedState}'`
);
}
function setDeclaredPlaybackState(tab, state) {
return SpecialPowers.spawn(tab.linkedBrowser, [state], playbackState => {
info(`set declared playback state to '${playbackState}'`);
content.navigator.mediaSession.playbackState = playbackState;
});
}