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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
add_task(async function() {
// Create a11y service.
const [a11yInitObserver, a11yInit] = initAccService();
await a11yInitObserver;
let accService = Cc["@mozilla.org/accessibilityService;1"].getService(
Ci.nsIAccessibilityService
);
await a11yInit;
ok(accService, "Service initialized");
// Accessible object reference will live longer than the scope of this
// function.
let acc = await new Promise(resolve => {
let intervalId = setInterval(() => {
let tabAcc = accService.getAccessibleFor(gBrowser.selectedTab);
if (tabAcc) {
clearInterval(intervalId);
resolve(tabAcc);
}
}, 10);
});
ok(acc, "Accessible object is created");
let canShutdown = false;
// This promise will resolve only if canShutdown flag is set to true. If
// 'a11y-init-or-shutdown' event with '0' flag comes before it can be shut
// down, the promise will reject.
const [a11yShutdownObserver, a11yShutdownPromise] = shutdownAccService();
await a11yShutdownObserver;
const a11yShutdown = new Promise((resolve, reject) =>
a11yShutdownPromise.then(flag =>
canShutdown
? resolve()
: reject("Accessible service was shut down incorrectly")
)
);
accService = null;
ok(!accService, "Service is removed");
// Force garbage collection that should not trigger shutdown because there is
// a reference to an accessible object.
forceGC();
// Have some breathing room when removing a11y service references.
await TestUtils.waitForTick();
// Now allow a11y service to shutdown.
canShutdown = true;
// Remove a reference to an accessible object.
acc = null;
ok(!acc, "Accessible object is removed");
// Force garbage collection that should now trigger shutdown.
forceGC();
await a11yShutdown;
});
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