T012
A test ends with @weft-js/core/browser listeners, intervals or subscribed values still open (checked by @weft-js/core/test after each test).
Fix: Unmount what the test created (dispose any createRoot), or fix the leak.
Status in weft@0.1.0: reported by @weft-js/core/test after each test.
A test that needs it on purpose keeps it with a reason: // weft-allow T012: <why> in the file header (whole file) or on the line above.
More: weft docs browser.