Run Vue Component Tests Where Vue Runs: The Browser
A Vue component's job is to produce DOM in a browser. Most component tests ask it to do that somewhere else: in Node, against a DOM that jsdom simulates. That has been the default since npm create vue@latest started offering Vitest with jsdom, and for plenty of tests it is the right trade. It does set a ceiling on what a green test proves, though. Nothing is ever drawn. Your CSS never runs and…
Component testing in Vue framework often simulates DOM in Node or jsdom, which limits tests to proving correctness without rendering, sizing, or styling. Twd-js offers a solution by running tests inside the actual dev server, beside the app, using actual DOM. This allows Vue component tests to render components in a real browser environment, enabling proper sizing, positioning, and CSS application.
A helper called componentHost creates a blank div for mounting components, while restorePage removes the host element after testing. With this setup, Vue components can be tested in their actual environment, ensuring proper behavior and appearance.
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