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

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JavaScript
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function test() {
gBrowser.addTab();
gBrowser.addTab();
gBrowser.addTab();
var tabs = gBrowser.tabs;
var owner;
is(tabs.length, 4, "4 tabs are open");
owner = gBrowser.selectedTab = tabs[2];
BrowserOpenTab();
is(gBrowser.selectedTab, tabs[4], "newly opened tab is selected");
gBrowser.removeCurrentTab();
is(gBrowser.selectedTab, owner, "owner is selected");
owner = gBrowser.selectedTab;
BrowserOpenTab();
gBrowser.selectedTab = tabs[1];
gBrowser.selectedTab = tabs[4];
gBrowser.removeCurrentTab();
isnot(gBrowser.selectedTab, owner, "selecting a different tab clears the owner relation");
owner = gBrowser.selectedTab;
BrowserOpenTab();
gBrowser.moveTabTo(gBrowser.selectedTab, 0);
gBrowser.removeCurrentTab();
is(gBrowser.selectedTab, owner, "owner relatitionship persists when tab is moved");
while (tabs.length > 1)
gBrowser.removeCurrentTab();
}