Bug repo for cypress-svelte-unit-test

This repository contains a simple case for which the cypress-svelte-unit-test fails because of the way the tested component is removed from the DOM.

Dependencies:

• Cypress 6.9.1
• cypress-svelte-unit-test 3.3.4

Bug

The plugin does not properly destroy the tested component giving a memory leak, but also hinders proper testing of more advanced components. In particular; the bug will break components that are updated through shared svelte stores. The fix is inspired by how cypress have added support for svelte components in v10.7.0. The motivation for this fix is to support testing of code bases on earlier versions of cypress.

Install & Run

1. install packages

# install specific version with the bug
npm install [email protected]

2. Run the test!

npm run cypress:run

3. Observe the bug

Expected result is that the very simple test will succeed, but it doesn't. It fails because the component is not completely destroyed between test cases. Updating the svelte store will then trigger DOM updates in these leaked components.

4. Replace package with PR version

Prerequisites:

• checkout branch, run git clone --branch destroy-component https://github.com/royalrex/cypress-svelte-unit-test.git
• remember the location it was cloned to
• run npm run build

# install from path, where the path is pointing to the above local cloned repo.
npm install ../cypress-svelte-unit-test

5. Observe the bug has been fixed

Observe that the tests now pass as expected.