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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/. */
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) {
return new Promise(resolve => {
let complete = false;
let listener = {
observe(event) {
let message = event.message;
if (
!(
message.startsWith("Warning: attempting to write") &&
message.includes(pref)
)
) {
return;
}
if (complete) {
return;
}
complete = true;
info("Warning while setting " + pref);
Services.console.unregisterListener(listener);
resolve(true);
},
};
do_timeout(1000, function () {
if (complete) {
return;
}
complete = true;
info("No warning while setting " + pref);
Services.console.unregisterListener(listener);
resolve(false);
});
Services.console.registerListener(listener);
Services.prefs.setCharPref(pref, buffer);
});
}
add_task(async function () {
// Simple change, shouldn't cause a warning
info("Checking that a simple change doesn't cause a warning");
let buf = makeBuffer(100);
let warned = await checkWarning("string.accept", buf);
Assert.ok(!warned);
// Large change, should cause a warning
info("Checking that a large change causes a warning");
buf = makeBuffer(32 * 1024);
warned = await checkWarning("string.warn", buf);
Assert.ok(warned);
});
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