Spring Boot REST API 单元测试执行中的 Null Page 对象

Question

我有以下 REST API 控制器类。

端点检索客户的分页列表。

@RestController
public class CustomerController {
    
    @Autowired
    private CustomerRepository customerRepository;
    
    public void setCustomerRepositoryMock(CustomerRepository mockedCustomerRepository) {
        this.customerRepository = mockedCustomerRepository;
    }

    @GetMapping(value="/customers", produces = "application/json")
    public ResponseEntity<Page<Customer>> customersList(
        @RequestParam(value="pageNumber") int pageNumber,
        @RequestParam(value="pageSize") int pageSize){
        
        Pageable customersPageable = PageRequest.of(pageNumber, pageSize);
        
        Page<Customer> customersList = customerRepository.findAll(customersPageable);
        
        return new ResponseEntity<Page<Customer>>(customersList, HttpStatus.OK);
    }
}

现在我想为该方法创建一个模拟单元测试。

这就是我所拥有的。

public class CustomerControllerTest {
    
    private CustomerRepository mockedCustomerRepository;
    private CustomerController customerController;
    private Customer customer;
    private Page<Customer> customersList;
    Pageable customersPageable;
    
    @BeforeEach
    void setup() {
    
        customer = new Customer();
        customer.setName("Pete");
        customer.setAge(35);
        customer.setEmail("pete@test.com");
        
        List<Customer> customersListTest = new ArrayList<Customer>();
        customersListTest.add(customer);    
        
        customersList = new PageImpl<>(customersListTest);
                
        mockedCustomerRepository = mock(CustomerRepository.class);
                
        customerController = new CustomerController();
        customerController.setCustomerRepositoryMock(mockedCustomerRepository);
        
    }
    
    @Test
    void testListCustomers() {

        when(mockedCustomerRepository.findAll(customersPageable)).thenReturn(customersList);    

        ResponseEntity<Page<Customer>> respPageCustomers = customerController.customersList(0, 3);
    
        assertTrue(respPageCustomers.getBody() != null);
        
    }
}

问题是当执行以下行时（在 API 方法中），CustomerList 为空。

Page<Customer> customersList = customerRepository.findAll(customersPageable);

但它应该有内容，因为内容是在测试类的setup方法中添加的，然后在测试方法的下一行中。

when(mockedCustomerRepository.findAll(customersPageable)).thenReturn(customersList);

Answer 1

替换

when(mockedCustomerRepository.findAll(customersPageable)).thenReturn(customersList);

与

when(mockedCustomerRepository.findAll(any(Pageable.class))).thenReturn(customersList);

您目前拥有的是 - 模拟存储库仅在收到确切的 customersPageable（为空）时才会返回结果。
如果提到的类的任何对象将作为参数传递，则使用 any() 将返回预期结果