forked from mirrors/gecko-dev
5886d1854f
Differential Revision: https://phabricator.services.mozilla.com/D14647 --HG-- extra : moz-landing-system : lando
64 lines
2.7 KiB
JavaScript
64 lines
2.7 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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// Tests that static preference varcaches in the content process
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// correctly handle values which are different from their
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// statically-defined defaults.
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//
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// Since we can't access varcaches values from JS, this tests relies on
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// assertions in debug builds to detect mismatches. The default and user
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// values of two preferences are changed (respectively) before a content
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// process is started. Once the content process is launched, the
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// preference service asserts that the values stored in all var caches
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// match their current values as known to the preference service. If
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// there's a mismatch, the shell will crash, and the test will fail.
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//
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// For sanity, we also check that the dynamically retrieved preference
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// values in the content process match our expectations, though this is
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// not strictly part of the test.
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const PREF1_NAME = "dom.webcomponents.shadowdom.report_usage";
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const PREF1_VALUE = false;
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const PREF2_NAME = "dom.mutation-events.cssom.disabled";
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const PREF2_VALUE = true;
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const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
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const {ExtensionTestUtils} = ChromeUtils.import("resource://testing-common/ExtensionXPCShellUtils.jsm");
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ExtensionTestUtils.init(this);
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const {prefs} = Services;
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const defaultPrefs = prefs.getDefaultBranch("");
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add_task(async function test_sharedMap_var_caches() {
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equal(prefs.getBoolPref(PREF1_NAME), PREF1_VALUE,
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`Expected initial value for ${PREF1_NAME}`);
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equal(prefs.getBoolPref(PREF2_NAME), PREF2_VALUE,
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`Expected initial value for ${PREF2_NAME}`);
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defaultPrefs.setBoolPref(PREF1_NAME, !PREF1_VALUE);
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prefs.setBoolPref(PREF2_NAME, !PREF2_VALUE);
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equal(prefs.getBoolPref(PREF1_NAME), !PREF1_VALUE,
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`Expected updated value for ${PREF1_NAME}`);
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equal(prefs.getBoolPref(PREF2_NAME), !PREF2_VALUE,
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`Expected updated value for ${PREF2_NAME}`);
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let contentPage = await ExtensionTestUtils.loadContentPage("about:blank", {remote: true});
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registerCleanupFunction(() => contentPage.close());
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/* eslint-disable no-shadow */
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let values = await contentPage.spawn([PREF1_NAME, PREF2_NAME], (prefs) => {
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const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
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return prefs.map(pref => Services.prefs.getBoolPref(pref));
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});
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/* eslint-enable no-shadow */
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equal(values[0], !PREF1_VALUE,
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`Expected content value for ${PREF1_NAME}`);
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equal(values[1], !PREF2_VALUE,
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`Expected content value for ${PREF2_NAME}`);
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});
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