refactor(animations): make animation testing work with fixture.whenRenderingDone

packages/core/src/render/api.ts

@@ -130,6 +130,7 @@ export abstract class RendererFactory2 {
   abstract createRenderer(hostElement: any, type: RendererType2|null): Renderer2;
   abstract begin?(): void;
   abstract end?(): void;
+  abstract whenRenderingDone?(): Promise<any>;
 }
 
 /**

packages/core/src/view/services.ts

@@ -607,6 +607,13 @@ class DebugRendererFactory2 implements RendererFactory2 {
       this.delegate.end();
     }
   }
+
+  whenRenderingDone(): Promise<any> {
+    if (this.delegate.whenRenderingDone) {
+      return this.delegate.whenRenderingDone();
+    }
+    return Promise.resolve(null);
+  }
 }