start project

frontend/src/test/setup.ts

@@ -0,0 +1,14 @@
+import { cleanup } from '@testing-library/react';
+import { afterEach } from 'vitest';
+
+import '@testing-library/jest-dom/vitest';
+
+// vitest.config.ts intentionally leaves `test.globals` off (test files import
+// describe/it/expect explicitly), so Testing Library's own auto-cleanup -
+// which only registers itself when it detects a *global* `afterEach` - never
+// fires on its own. Without this, unmounted DOM from one `it()` block leaks
+// into the next within the same file, and every query starts matching
+// duplicate nodes.
+afterEach(() => {
+  cleanup();
+});