forked from mirrors/gecko-dev
5886d1854f
Differential Revision: https://phabricator.services.mozilla.com/D14647 --HG-- extra : moz-landing-system : lando
58 lines
1.7 KiB
JavaScript
58 lines
1.7 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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function makeBuffer(length) {
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return new Array(length + 1).join("x");
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}
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/**
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* @resolves |true| if execution proceeded without warning,
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* |false| if there was a warning.
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*/
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function checkWarning(pref, buffer) {
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return new Promise(resolve => {
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let complete = false;
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let listener = {
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observe(event) {
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let message = event.message;
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if (!(message.startsWith("Warning: attempting to write")
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&& message.includes(pref))) {
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return;
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}
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if (complete) {
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return;
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}
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complete = true;
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info("Warning while setting " + pref);
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Services.console.unregisterListener(listener);
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resolve(true);
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},
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};
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do_timeout(1000, function() {
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if (complete) {
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return;
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}
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complete = true;
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info("No warning while setting " + pref);
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Services.console.unregisterListener(listener);
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resolve(false);
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});
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Services.console.registerListener(listener);
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Services.prefs.setCharPref(pref, buffer);
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});
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}
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add_task(async function() {
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// Simple change, shouldn't cause a warning
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info("Checking that a simple change doesn't cause a warning");
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let buf = makeBuffer(100);
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let warned = await checkWarning("string.accept", buf);
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Assert.ok(!warned);
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// Large change, should cause a warning
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info("Checking that a large change causes a warning");
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buf = makeBuffer(32 * 1024);
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warned = await checkWarning("string.warn", buf);
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Assert.ok(warned);
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});
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