Add setup function for the event module

(cherry picked from the commit 2c0b9027)

test/unit/event.js

-module("event", { teardown: moduleTeardown });
+module( "event", {
+	setup: function() {
+		document.body.focus();
+	},
+	teardown: moduleTeardown
+});
 
 test("null or undefined handler", function() {
 	expect(2);
@@ -2644,8 +2649,6 @@ test( "Check order of focusin/focusout events", 2, function() {
 	var focus, blur,
 		input = jQuery( "#name" );
 
-	document.body.focus();
-
 	input.on( "focus", function() {
 		focus = true;