Restore QUnit's now dead feature of using jQuery to reset the fixture. Fixes tooltip unit tests

Author: jzaefferer

tests/unit/testsuite.js

@@ -1,5 +1,7 @@
 (function( $ ) {
 
+var reset, jshintLoaded;
+
 window.TestHelpers = {};
 
 function includeStyle( url ) {
@@ -10,6 +12,15 @@ function includeScript( url ) {
 	document.write( "<script src='../../../" + url + "'></script>" );
 }
 
+reset = QUnit.reset;
+QUnit.reset = function() {
+	// Ensure jQuery events and data on the fixture are properly removed
+	jQuery("#qunit-fixture").empty();
+	// Let QUnit reset the fixture
+	reset.apply( this, arguments );
+};
+
+
 QUnit.config.requireExpects = true;
 
 QUnit.config.urlConfig.push({
@@ -38,7 +49,7 @@ QUnit.config.urlConfig.push({
 	tooltip: "Skip running JSHint, e.g. within TestSwarm, where Jenkins runs it already"
 });
 
-var jshintLoaded = false;
+jshintLoaded = false;
 TestHelpers.testJshint = function( module ) {
 	if ( QUnit.urlParams.nojshint ) {
 		return;