add_task(function*() { yield BrowserTestUtils.withNewTab({ gBrowser, url: "data:text/html,", }, function*(browser) { yield ContentTask.spawn(browser, "", function() { let tttp = Cc["@mozilla.org/embedcomp/default-tooltiptextprovider;1"] .getService(Ci.nsITooltipTextProvider); let i = content.document.getElementById("i"); ok(!tttp.getNodeText(i, {}, {}), "No tooltip should be shown when @title is null"); i.title = "foo"; ok(tttp.getNodeText(i, {}, {}), "A tooltip should be shown when @title is not the empty string"); i.pattern = "bar"; ok(tttp.getNodeText(i, {}, {}), "A tooltip should be shown when @title is not the empty string"); }); }); });