@gray-kilobyte-89541 it spins up a dev server: https://docs.cypress.io/guides/component-testing/component-framework-configuration#Vue-with-Vite cypress offers some out of the box options like. webpack and vite. which then servs a index.html file https://docs.cypress.io/guides/component-testing/component-framework-configuration#Custom-Index-File in which the component gets mounted and per default cypress looks for the dev server on http://localhost:3000