importScripts('worker-testharness.js'); self.oninstall = function(event) { assert_true(event instanceof ExtendableEvent, 'instance of ExtendableEvent'); assert_true(event instanceof InstallEvent, 'instance of InstallEvent'); assert_equals(event.type, 'install', '`type` property value'); assert_false(event.cancelable, '`cancelable` property value'); assert_false(event.bubbles, '`bubbles` property value'); };