chore: prevent geometry test from running when iOS simulator fails to (#4510)

constrain window size

Author: jelbourn

src/lib/core/ripple/ripple.spec.ts

@@ -18,6 +18,9 @@ describe('MdRipple', () => {
   let originalBodyMargin: string;
   let viewportRuler: ViewportRuler;
 
+  const startingWindowWidth = window.innerWidth;
+  const startingWindowHeight = window.innerHeight;
+
   beforeEach(() => {
     TestBed.configureTestingModule({
       imports: [MdRippleModule],
@@ -57,6 +60,15 @@ describe('MdRipple', () => {
     });
 
     it('sizes ripple to cover element', () => {
+      // In the iOS simulator (BrowserStack & SauceLabs), adding the content to the
+      // body causes karma's iframe for the test to stretch to fit that content once we attempt to
+      // scroll the page. Setting width / height / maxWidth / maxHeight on the iframe does not
+      // successfully constrain its size. As such, skip assertions in environments where the
+      // window size has changed since the start of the test.
+      if (window.innerWidth > startingWindowWidth || window.innerHeight > startingWindowHeight) {
+        return;
+      }
+
       let elementRect = rippleTarget.getBoundingClientRect();
 
       // Dispatch a ripple at the following relative coordinates (X: 50| Y: 75)
@@ -192,9 +204,6 @@ describe('MdRipple', () => {
     });
 
     describe('when page is scrolled', () => {
-      const startingWindowWidth = window.innerWidth;
-      const startingWindowHeight = window.innerHeight;
-
       let veryLargeElement: HTMLDivElement = document.createElement('div');
       let pageScrollTop = 500;
       let pageScrollLeft = 500;