fix: #89 use key for get id in test

Author: daros10

src/app/modules/customer-management/services/customer.service.spec.ts

@@ -47,8 +47,8 @@ describe('CustomerService', () => {
     ];
     const key = 'id';
     const url = `${service.baseUrl}/1`;
-    service.deleteCustomer(customer[0].id).subscribe((customerResponse) => {
-      expect(customerResponse.filter((customers) => customers[key] !== customers[0].id)).toEqual([customer[1]]);
+    service.deleteCustomer(customer[0][key]).subscribe((customerResponse) => {
+      expect(customerResponse.filter((customers) => customers[key] !== customers[0][key])).toEqual([customer[1]]);
     });
     const getCustomerRequest = httpMock.expectOne(url);