Found that testcafe-vue-selectors was not compatible with Nuxt apps, because the Vue/Nuxt instance element is "window.$nuxt" instead of "window.Vue". Also Nuxt library does not show the "Vue" version in the instance, so i forked your "testcafe-vue-selectors" module and did the needed changes, with a nuxt app example and tests included in the repo.
Anyway, it needs some improvements, but does the job for now. For example, could VueSelector wait until a vue property named "_isMounted" is "true"?
Right now sometimes the tests are not consistent, and maybe is because VueSelector does not wait until the component is ready/mounted. So when you call "getVue()", there is a probability to fail if testcafe wants to check the property "too early".
As always, feedback is really welcome!