diff --git a/src/routes/user.routes.test.ts b/src/routes/user.routes.test.ts
index eaed8731..259221f8 100644
--- a/src/routes/user.routes.test.ts
+++ b/src/routes/user.routes.test.ts
@@ -186,7 +186,7 @@ describe('User Routes (/api/users)', () => {
           .send({ category: 'Produce' });
         expect(response.status).toBe(400);
         // Check the 'errors' array for the specific validation message.
-        expect(response.body.errors[0].message).toContain("expected string, received undefined");
+        expect(response.body.errors[0].message).toBe("Field 'itemName' is required.");
       });
 
       it('should return 400 if category is missing', async () => {
@@ -195,7 +195,7 @@ describe('User Routes (/api/users)', () => {
           .send({ itemName: 'Apples' });
         expect(response.status).toBe(400);
         // Check the 'errors' array for the specific validation message.
-        expect(response.body.errors[0].message).toContain("expected string, received undefined");
+        expect(response.body.errors[0].message).toBe("Field 'category' is required.");
       });
     });
 
@@ -240,7 +240,7 @@ describe('User Routes (/api/users)', () => {
         const response = await supertest(app).post('/api/users/shopping-lists').send({});
         expect(response.status).toBe(400);
         // Check the 'errors' array for the specific validation message.
-        expect(response.body.errors[0].message).toContain("expected string, received undefined");
+        expect(response.body.errors[0].message).toBe("Field 'name' is required.");
       });
 
       it('should return 400 on foreign key constraint error', async () => {
diff --git a/src/services/db/flyer.db.test.ts b/src/services/db/flyer.db.test.ts
index 1ed9d152..f676a143 100644
--- a/src/services/db/flyer.db.test.ts
+++ b/src/services/db/flyer.db.test.ts
@@ -249,10 +249,11 @@ describe('Flyer DB Service', () => {
         mockClient.query
           .mockResolvedValueOnce({ rows: [{ store_id: 1 }] }) // findOrCreateStore
           .mockRejectedValueOnce(dbError); // insertFlyer fails
-        // The withTransaction helper will catch this and roll back
-        await expect(callback(mockClient as unknown as PoolClient)).rejects.toThrow(dbError);
-        // re-throw because withTransaction re-throws
-        throw dbError;
+        // The withTransaction helper will catch this and roll back.
+        // Since insertFlyer wraps the DB error, we expect the wrapped error message here.
+        await expect(callback(mockClient as unknown as PoolClient)).rejects.toThrow('Failed to insert flyer into database.');
+        // re-throw because withTransaction re-throws (simulating the wrapped error propagating up)
+        throw new Error('Failed to insert flyer into database.');
       });
 
       // The transactional function re-throws the original error from the failed step.