changed field from availability to isAvailable

backend/tests/unit/routes/rentals.test.js

@@ -260,7 +260,7 @@ describe('Rentals Routes', () => {
       id: 1,
       name: 'Test Item',
       ownerId: 2,
-      availability: true,
+      isAvailable: true,
       pricePerHour: 10,
       pricePerDay: 50,
     };
@@ -340,7 +340,7 @@ describe('Rentals Routes', () => {
     });
 
     it('should return 400 for unavailable item', async () => {
-      Item.findByPk.mockResolvedValue({ ...mockItem, availability: false });
+      Item.findByPk.mockResolvedValue({ ...mockItem, isAvailable: false });
 
       const response = await request(app)
         .post('/rentals')
@@ -382,7 +382,7 @@ describe('Rentals Routes', () => {
       Item.findByPk.mockResolvedValue({
         id: 1,
         ownerId: 2,
-        availability: true,
+        isAvailable: true,
         pricePerHour: 0,
         pricePerDay: 0
       });