test: improve mock error handling and add test cleanup

src/__tests__/unit/tournament-update.test.ts

@@ -3,7 +3,7 @@
  * Tests the allowTies field is properly saved when updating tournaments
  */
 
-import { describe, it, expect, mock, beforeEach,} from 'bun:test';
+import { describe, it, expect, mock, beforeEach, afterAll } from 'bun:test';
 
 // Create mock functions at module level
 const eventFindUniqueMock = mock(async () => ({}));
@@ -27,6 +27,11 @@ mock.module('@/lib/permissions', () => ({
   canDeleteTournament: canDeleteTournamentMock,
 }));
 
+// Cleanup after all tests in this file
+afterAll(() => {
+  mock.restore('module');
+});
+
 // Import the route handler after mocking
 import { PUT } from '@/app/api/tournaments/[id]/route';
 import { prisma } from '@/lib/prisma';