diff --git a/tests/AppDeletion.test.ts b/tests/AppDeletion.test.ts
new file mode 100644
index 0000000..4635df5
--- /dev/null
+++ b/tests/AppDeletion.test.ts
@@ -0,0 +1,13 @@
+import { ensureAppsExist } from '../src/routes/user/apps/appdefinition/AppDefinitionRouter'
+
+describe('app deletion', () => {
+    test('rejects the entire request when any requested app is missing', () => {
+        expect(() =>
+            ensureAppsExist(['existing-app', 'missing-app'], {
+                'existing-app': {},
+            })
+        ).toThrow(
+            'App (missing-app) could not be found. Make sure that you have created the app.'
+        )
+    })
+})