I've tried to stub the Vue Transition component but was unable to do so. I was able to unstub the component with transition: false (since it is stubbed by default) but if I want to provide a custom stub, e.g. transition: {template: '<p></p>'}, it gets ignored.

Here is a repo with a custom transition stub: https://github.com/Thomasan1999/vue-test-utils-next-transition.