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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
Cu.import("resource://gre/modules/Promise.jsm");
var cs = Cc["@mozilla.org/consoleservice;1"].
getService(Ci.nsIConsoleService);
var ps = Cc["@mozilla.org/preferences-service;1"].
getService(Ci.nsIPrefService);
function makeBuffer(length) {
return new Array(length + 1).join('x');
}
/**
* @resolves |true| if execution proceeded without warning,
* |false| if there was a warning.
*/
function checkWarning(pref, buffer) {
let deferred = Promise.defer();
let complete = false;
let listener = {
observe: function(event) {
let message = event.message;
if (!(message.startsWith("Warning: attempting to write")
&& message.includes(pref))) {
return;
}
if (complete) {
return;
}
complete = true;
do_print("Warning while setting " + pref);
cs.unregisterListener(listener);
deferred.resolve(true);
}
};
do_timeout(1000, function() {
if (complete) {
return;
}
complete = true;
do_print("No warning while setting " + pref);
cs.unregisterListener(listener);
deferred.resolve(false);
});
cs.registerListener(listener);
ps.setCharPref(pref, buffer);
return deferred.promise;
}
function run_test() {
run_next_test();
}
add_task(function() {
// Simple change, shouldn't cause a warning
do_print("Checking that a simple change doesn't cause a warning");
let buf = makeBuffer(100);
let warned = yield checkWarning("string.accept", buf);
do_check_false(warned);
// Large change, should cause a warning
do_print("Checking that a large change causes a warning");
buf = makeBuffer(32 * 1024);
warned = yield checkWarning("string.warn", buf);
do_check_true(warned);
});
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