diff --git a/tests/characters.spec.js b/tests/characters.spec.js
index 3df2e30..1750ace 100644
--- a/tests/characters.spec.js
+++ b/tests/characters.spec.js
@@ -124,6 +124,8 @@ test('current-version image pairs marked inconsistent show a review warning', as
 });
 
 test('character appearance forms stay in one record and switch the detail view', async ({ page }) => {
+  // Switching the form saves the record, so stand in for the API instead of writing to the real library.
+  await mockRecord(page, { id: 'c-forms', book: 'Smoke Book', name: 'Zerwas', tags: '', sheet: {} });
   await page.route('**/api/book-profile*', route => route.fulfill({ json: { profile: {} } }));
   await page.goto('/', { waitUntil: 'domcontentloaded' });
   await page.waitForSelector('#lib-chars-list', { state: 'attached', timeout: 15_000 });