test(dialog): custom class option.

Added missing unit test to check if overlay pane has custom panel class.

angular#4718 angular#4012

src/lib/core/overlay/overlay.spec.ts

@@ -336,6 +336,24 @@ describe('Overlay', () => {
 
   });
 
+  describe('panelClass', () => {
+    let config: OverlayState;
+
+    beforeEach(() => {
+      config = new OverlayState();
+      config.panelClass = 'custom-panel-class';
+    });
+
+    it('should apply a custom overlay pane class', () => {
+      let overlayRef = overlay.create(config);
+      overlayRef.attach(componentPortal);
+      viewContainerFixture.detectChanges();
+
+      let pane = overlayContainerElement.querySelector('.cdk-overlay-pane') as HTMLElement;
+      expect(pane.classList).toContain('custom-panel-class');
+    });
+  });
+
   describe('scroll strategy', () => {
     let fakeScrollStrategy: FakeScrollStrategy;
     let config: OverlayState;