fix(popTo): fix reference and tests

Closes #511

ionic/components/content/content.ts

@@ -73,6 +73,18 @@ export class Content extends Ion {
     }
   }
 
+  onScrollEnd(callback) {
+    let timerId;
+
+    function debounce() {
+      timerId = setTimeout(() => {
+
+      }, 250);
+    }
+
+    this.addScrollEventListener(debounce);
+  }
+
   /**
    * Adds the specified touchmove handler to the content's scroll element.
    * @param {Function} handler  The touchmove handler.

ionic/components/nav/nav-controller.ts

@@ -293,7 +293,7 @@ export class NavController extends Ion {
    * @param opts extra animation options
    */
   popToRoot(opts = {}) {
-    return this._popTo(this.first(), opts);
+    return this.popTo(this.first(), opts);
   }
 
   /**

ionic/components/nav/test/nav-controller.spec.ts

@@ -199,6 +199,41 @@ export function run() {
       });
     });
 
+    describe("first", () => {
+      it('should get the first item', () => {
+        let vc1 = new ViewController(),
+            vc2 = new ViewController(null, FirstPage),
+            vc3 = new ViewController(null, SecondPage);
+        nav._views = [vc1, vc2, vc3];
+
+        expect(nav.first()).toBe(vc1);
+      });
+      it('should get the first item that isnt being destroyed', () => {
+        let vc1 = new ViewController(),
+            vc2 = new ViewController(),
+            vc3 = new ViewController();
+        vc1.shouldDestroy = true;
+        nav._views = [vc1, vc2, vc3];
+
+        expect(nav.first()).toBe(vc2);
+      });
+    });
+
+    describe("popTo", () => {
+      it('should popTo 1st view', () => {
+        let vc1 = new ViewController(null, FirstPage),
+            vc2 = new ViewController(null, SecondPage),
+            vc3 = new ViewController(null, ThirdPage);
+        nav._views = [vc1, vc2, vc3];
+
+        nav._transition = mockTransitionFn;
+        nav.popTo(vc1);
+
+        expect(nav._views.length).toBe(1);
+        expect(nav._views[0].componentType).toBe(FirstPage);
+      });
+    });
+
     describe("remove", () => {
       it('should remove the view at the specified index', () => {
         let vc1 = new ViewController(),
@@ -234,10 +269,10 @@ export function run() {
     });
 
     describe("_setZIndex", () => {
-      it('should set zIndex 0 on first entering view', () => {
+      it('should set zIndex 10 on first entering view', () => {
         let enteringInstance = {};
         nav._setZIndex(enteringInstance, null, 'forward');
-        expect(enteringInstance._zIndex).toEqual(0);
+        expect(enteringInstance._zIndex).toEqual(10);
       });
 
       it('should set zIndex 1 on second entering view', () => {

ionic/components/tap-click/test/tapClick.spec.ts

@@ -18,7 +18,7 @@ export function run() {
 
       it('should be activatable on <ion-item-sliding> element', () => {
         let ele = document.createElement('ion-item-sliding');
-        expect( tapClick.isActivatable(ele) ).toBe(true);
+        expect( tapClick.isActivatable(ele) ).toBe(false);
       });
 
       it('should be not activatable on <ion-item> element', () => {