Spring MVC控制器测试PUT

Question

尝试用junit5和mockito测试我的web层（spring boot、spring mvc）。http方法的所有其他测试（get、put等）工作正常，但更新。遵循代码。

控制器：

@PutMapping(value = "{id}")
public ResponseEntity<?> putOne(@PathVariable Integer id, @Valid @RequestBody Customer customerToUpdate) {
    Customer updated = customerService.update(id, customerToUpdate);
    return ResponseEntity.ok(updated);
}    

服务：

public Customer update(Integer customerId, Customer customerToUpdate) {
    Customer customerFound = customerRepository.findById(customerId).orElseThrow(() -> {
        throw new CustomerControllerAdvice.MyNotFoundException(customerId.toString());
    });

    customerToUpdate.setId(customerFound.getId());

    return customerRepository.save(customerToUpdate);
}

最后，测试：

static final Customer oneCustomer = Customer.of(3,"john", LocalDate.of(1982, 11, 8));
    
@Test
void putOneTest() throws  Exception {
    when(customerService.update(oneCustomer.getId(), oneCustomer)).thenReturn(oneCustomer);

    mockMvc.perform(put(CUSTOMER_URL + oneCustomer.getId())
                    .contentType(MediaType.APPLICATION_JSON)
                    .content(objectMapper.writeValueAsString(oneCustomer)))
            .andDo(print())
            .andExpect(jsonPath("$.name").value(oneCustomer.getName()))
                .andExpect(jsonPath("$.birthDate").value(oneCustomer.getBirthDate().toString()))
                .andExpect(status().isOk());
}

结果：

java.lang.AssertionError: No value at JSON path "$.name"

CustomerService中的update（...）方法返回为null。无法理解方式。请建议。

Answer 1

问题是这一行：

when(customerService.update(oneCustomer.getId(), oneCustomer)).thenReturn(oneCustomer);

你应该把它改成

when(customerService.update(eq(oneCustomer.getId()), any())).thenReturn(oneCustomer);

因为您的put请求正文是JSON，而不是真正的Client，所以当... thenBack语句没有像您预期的那样工作良好。mockedCusterService默认返回null。这就是为什么您得到一个空响应。因此您必须更正参数匹配器才能使其生效。