feat(jqlite): added show(),hide() and eq() methods to jqlite

- add those three methods to jqlite

test/jqLiteSpec.js

@@ -507,4 +507,70 @@ describe('jqLite', function(){
       expect(innerDiv.html()).toEqual('text');
     });
   });
+
+
+  describe('hide', function() {
+    var element;
+
+    afterEach(function() {
+      if (element) dealoc(element);
+    });
+
+    it('should hide the element', function() {
+      element = jqLite('<div></div>');
+      expect(isCssVisible(element)).toBe(true);
+      element.hide();
+      expect(isCssVisible(element)).toBe(false);
+    });
+  });
+
+
+  describe('show', function() {
+    var element;
+
+    afterEach(function() {
+      if (element) dealoc(element);
+      element.remove();
+    });
+
+
+    it('should show the element ', function() {
+      element = jqLite('<div></div>');
+      element[0].style.display = 'none';
+      expect(isCssVisible(element)).toBe(false);
+      element.show();
+      expect(isCssVisible(element)).toBe(true);
+    });
+
+
+    it('should show previously hidden element and preserve the display value', function() {
+      element = jqLite('<div style="display:inline">xx</div>');
+      jqLite(document.body).append(element);
+      element.hide();
+      expect(isCssVisible(element)).toBe(false);
+      element.show();
+      expect(element[0].style.display).toBe('inline');
+      expect(isCssVisible(element)).toBe(true);
+
+      element[0].style.display = 'block';
+      element.hide();
+      expect(isCssVisible(element)).toBe(false);
+      element.show();
+      expect(isCssVisible(element)).toBe(true);
+
+      // this totally doesn't make sense, it should be 'block', but jquery (1.4.2+1.6.2) behaves
+      // this way.
+      expect(element[0].style.display).toBe('inline');
+    });
+  });
+
+
+  describe('eq', function() {
+    it('should select the nth element ', function() {
+      var element = jqLite('<div><span>aa</span></div><div><span>bb</span></div>');
+      expect(element.find('span').eq(0).html()).toBe('aa');
+      expect(element.find('span').eq(-1).html()).toBe('bb');
+      expect(element.find('span').eq(20).length).toBe(0);;
+    });
+  });
 });

test/testabilityPatch.js

@@ -274,9 +274,13 @@ function sortedHtml(element, showNgClass) {
   return html;
 }
 
+
+/**
+ * This method is a cheap way of testing if css for a given node is not set to 'none'. It doesn't
+ * actually test if an element is displayed by the browser. Be aware!!!
+ */
 function isCssVisible(node) {
   var display = node.css('display');
-  if (display == 'block') display = "";
   return display != 'none';
 }