The Tor Browser / file revision

 /* Any copyright is dedicated to the Public Domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 /**

  * Tests if the canvas debugger leaks on initialization and sudden destruction.

  * You can also use this initialization format as a template for other tests.

  */

 function ifTestingSupported() {

   let [target, debuggee, front] = yield initCallWatcherBackend(SIMPLE_CANVAS_URL);

   ok(target, "Should have a target available.");

   ok(debuggee, "Should have a debuggee available.");

   ok(front, "Should have a protocol front available.");

   yield removeTab(target.tab);

   finish();

 }