gecko/browser/base/content/test/browser_bug596687.js

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function test() {
var tab = gBrowser.addTab(null, {skipAnimation: true});
gBrowser.selectedTab = tab;
var gotTabAttrModified = false;
var gotTabClose = false;
function onTabClose() {
gotTabClose = true;
tab.addEventListener("TabAttrModified", onTabAttrModified, false);
}
function onTabAttrModified() {
gotTabAttrModified = true;
}
tab.addEventListener("TabClose", onTabClose, false);
gBrowser.removeTab(tab);
ok(gotTabClose, "should have got the TabClose event");
ok(!gotTabAttrModified, "shouldn't have got the TabAttrModified event after TabClose");
tab.removeEventListener("TabClose", onTabClose, false);
tab.removeEventListener("TabAttrModified", onTabAttrModified, false);
}