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Test Info:
function numClosedTabs() {
return SessionStore.getClosedTabCount();
}
function isUndoCloseEnabled() {
updateTabContextMenu();
return !document.getElementById("context_undoCloseTab").disabled;
}
add_task(async function test() {
Services.prefs.setIntPref("browser.sessionstore.max_tabs_undo", 0);
Services.prefs.clearUserPref("browser.sessionstore.max_tabs_undo");
is(numClosedTabs(), 0, "There should be 0 closed tabs.");
ok(!isUndoCloseEnabled(), "Undo Close Tab should be disabled.");
var browser = gBrowser.getBrowserForTab(tab);
await BrowserTestUtils.browserLoaded(browser);
let sessionUpdatePromise = BrowserTestUtils.waitForSessionStoreUpdate(tab);
BrowserTestUtils.removeTab(tab);
await sessionUpdatePromise;
ok(isUndoCloseEnabled(), "Undo Close Tab should be enabled.");
});