test: add test case

Author: zombieJ

tests/StrictMode.spec.tsx

@@ -50,13 +50,15 @@ describe('StrictMode', () => {
     act(() => {
       jest.runAllTimers();
     });
+    expect(ref.current.inMotion()).toBeTruthy();
     expect(node).not.toHaveClass('transition-appear-start');
     expect(node).toHaveClass('transition-appear-active');
 
     // Trigger End
     fireEvent.transitionEnd(node);
     expect(node).not.toHaveClass('transition-appear');
 
+    expect(ref.current.inMotion()).toBeFalsy();
     expect(ref.current.nativeElement).toBe(node);
   });
 });