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90 lines
2.6 KiB
JavaScript
90 lines
2.6 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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Cu.import("resource://gre/modules/commonjs/sdk/core/promise.js");
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let cs = Cc["@mozilla.org/consoleservice;1"].
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getService(Ci.nsIConsoleService);
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let ps = Cc["@mozilla.org/preferences-service;1"].
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getService(Ci.nsIPrefService);
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function makeBuffer(length) {
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let string = "x";
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while (string.length < length) {
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string = string + string;
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}
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if (string.length > length) {
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string = string.substring(length - string.length);
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}
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return string;
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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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let deferred = Promise.defer();
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let complete = false;
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let listener = {
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observe: function(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.contains(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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do_print("Warning while setting " + pref);
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cs.unregisterListener(listener);
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deferred.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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do_print("No warning while setting " + pref);
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cs.unregisterListener(listener);
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deferred.resolve(false);
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});
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cs.registerListener(listener);
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ps.setCharPref(pref, buffer);
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return deferred.promise;
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}
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function run_test() {
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run_next_test();
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}
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add_task(function() {
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// Very large change, should fail
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try {
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ps.setCharPref("string.fail", makeBuffer(16 * 1024 * 1024));
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do_print("Writing to string.fail should have failed");
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do_check_true(false); // We should have failed
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} catch (ex if ex.result == Cr.NS_ERROR_OUT_OF_MEMORY) {
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do_print("Writing to string.fail failed for the right reasons");
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do_check_true(true); // Failed for the right reason
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} catch (ex) {
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do_print("Writing to string.fail failed for bad reasons");
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do_check_true(false); // Failed for the wrong reason
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}
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// Simple change, shouldn't cause a warning
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do_print("Checking that a simple change doesn't cause a warning");
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let buf = makeBuffer(100);
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let warned = yield checkWarning("string.accept", buf);
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do_check_false(warned);
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// Large change, should cause a warning
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do_print("Checking that a large change causes a warning");
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buf = makeBuffer(32 * 1024);
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warned = yield checkWarning("string.warn", buf);
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do_check_true(warned);
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});
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