gecko/browser/base/content/test/browser_bug580956.js

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function numClosedTabs()
Cc["@mozilla.org/browser/sessionstore;1"].
getService(Ci.nsISessionStore).
getClosedTabCount(window);
function isUndoCloseEnabled() {
document.popupNode = gBrowser.tabs[0];
TabContextMenu.updateContextMenu(document.getElementById("tabContextMenu"));
return !document.getElementById("context_undoCloseTab").disabled;
}
function test() {
waitForExplicitFinish();
gPrefService.setIntPref("browser.sessionstore.max_tabs_undo", 0);
gPrefService.clearUserPref("browser.sessionstore.max_tabs_undo");
is(numClosedTabs(), 0, "There should be 0 closed tabs.");
ok(!isUndoCloseEnabled(), "Undo Close Tab should be disabled.");
var tab = gBrowser.addTab("http://mochi.test:8888/");
var browser = gBrowser.getBrowserForTab(tab);
browser.addEventListener("load", function() {
gBrowser.removeTab(tab);
ok(isUndoCloseEnabled(), "Undo Close Tab should be enabled.");
finish();
}, true);
}