add reproduction of issue

Author: jroberts

src/components/__tests__/HelloWorld.spec.ts

@@ -7,6 +7,9 @@ describe('HelloWorld.vue', () => {
     const msg = 'new message';
     const wrapper = shallowMount(HelloWorld, {
       propsData: { msg },
+      stubs: {
+        transition:false
+      }
     });
     expect(wrapper.text()).toMatch(msg);
   });