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Test Info:
// This test ensures that only one command update happens when switching tabs.
"use strict";
add_task(async function () {
const uri = "data:text/html,<body><input>";
let tab1 = await BrowserTestUtils.openNewForegroundTab(gBrowser, uri);
let tab2 = await BrowserTestUtils.openNewForegroundTab(gBrowser, uri);
let updates = [];
function countUpdates() {
updates.push(new Error().stack);
}
let updater = document.getElementById("editMenuCommandSetAll");
updater.addEventListener("commandupdate", countUpdates, true);
await BrowserTestUtils.switchTab(gBrowser, tab1);
is(updates.length, 1, "only one command update per tab switch");
if (updates.length > 1) {
for (let stack of updates) {
info("Update stack:\n" + stack);
}
}
updater.removeEventListener("commandupdate", countUpdates, true);
BrowserTestUtils.removeTab(tab1);
BrowserTestUtils.removeTab(tab2);
});