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test(setup): disable SvelteKit hover prefetch in browser-mode runs

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Hover-prefetch fires real fetch requests for route loader chunks; those
requests go through the same Playwright route handler that serves mocked
modules. An in-flight prefetch landing after iframe teardown can hit the
handler with a closed birpc channel, raising an unhandled rejection that
exits the run with code 1 even when every individual test was green.

Add `src/test-setup.ts` that sets `document.body.dataset.sveltekitPreloadData
= 'off'` and wire it via `setupFiles` in both `vite.config.ts` (client
project) and `vitest.client-coverage.config.ts` (Istanbul coverage config).
Add `src/__meta__/browser-preload-disabled.svelte.test.ts` asserting the
setup ran. Zero production impact.

Issue #553 secondary trigger.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-05-12 22:02:57 +02:00
parent 9f1b8b4215
commit 3c9e40ca71
4 changed files with 26 additions and 0 deletions
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8
frontend/src/test-setup.ts Normal file
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// Disable SvelteKit hover-prefetch in browser-mode tests. ADR-012 / #553.
//
// Hover-prefetch fires real fetch requests for route loader chunks; those
// requests go through the same Playwright route handler that serves mocked
// modules. An in-flight prefetch landing after iframe teardown can hit the
// route handler with a closed birpc channel, raising an unhandled rejection
// that exits the run with code 1 even when every individual test was green.
document.body.dataset.sveltekitPreloadData = 'off';