address comments

Author: mmalerba

src/cdk-experimental/scrolling/virtual-scroll-viewport.spec.ts

@@ -393,13 +393,14 @@ describe('CdkVirtualScrollViewport', () => {
 
     it('should recycle views when template cache is large enough to accommodate', fakeAsync(() => {
       testComponent.trackBy = i => i;
-      spyOn(testComponent.cdkForOfViewContainer, 'createEmbeddedView').and.callThrough();
+      const spy =
+          spyOn(testComponent.cdkForOfViewContainer, 'createEmbeddedView').and.callThrough();
       finishInit(fixture);
 
       // Should create views for the initial rendered items.
       expect(testComponent.cdkForOfViewContainer.createEmbeddedView).toHaveBeenCalledTimes(4);
 
-      (testComponent.cdkForOfViewContainer.createEmbeddedView as any).calls.reset();
+      spy.calls.reset();
       triggerScroll(viewport, 10);
       fixture.detectChanges();
 
@@ -408,7 +409,7 @@ describe('CdkVirtualScrollViewport', () => {
       // item is now partially on the screen at the bottom and so a new view is needed.
       expect(testComponent.cdkForOfViewContainer.createEmbeddedView).toHaveBeenCalledTimes(1);
 
-      (testComponent.cdkForOfViewContainer.createEmbeddedView as any).calls.reset();
+      spy.calls.reset();
       const maxOffset =
           testComponent.itemSize * testComponent.items.length - testComponent.viewportSize;
       for (let offset = 10; offset <= maxOffset; offset += 10) {
@@ -424,13 +425,14 @@ describe('CdkVirtualScrollViewport', () => {
     it('should not recycle views when template cache is full', fakeAsync(() => {
       testComponent.trackBy = i => i;
       testComponent.templateCacheSize = 0;
-      spyOn(testComponent.cdkForOfViewContainer, 'createEmbeddedView').and.callThrough();
+      const spy =
+          spyOn(testComponent.cdkForOfViewContainer, 'createEmbeddedView').and.callThrough();
       finishInit(fixture);
 
       // Should create views for the initial rendered items.
       expect(testComponent.cdkForOfViewContainer.createEmbeddedView).toHaveBeenCalledTimes(4);
 
-      (testComponent.cdkForOfViewContainer.createEmbeddedView as any).calls.reset();
+      spy.calls.reset();
       triggerScroll(viewport, 10);
       fixture.detectChanges();
 
@@ -439,7 +441,7 @@ describe('CdkVirtualScrollViewport', () => {
       // item is now partially on the screen at the bottom and so a new view is needed.
       expect(testComponent.cdkForOfViewContainer.createEmbeddedView).toHaveBeenCalledTimes(1);
 
-      (testComponent.cdkForOfViewContainer.createEmbeddedView as any).calls.reset();
+      spy.calls.reset();
       const maxOffset =
           testComponent.itemSize * testComponent.items.length - testComponent.viewportSize;
       for (let offset = 10; offset <= maxOffset; offset += 10) {