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(get, put，…)上的所有其他测试都工作良好，但更新。

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);
}

最后的测试:

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"

update(…)方法在CustomerService返回null。不能理解的方式。请建议。

Answer 1

问题出在这一行:

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

应该改成

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

因为您的put请求体是JSON，而不是真正的Customer，所以when...thenReturn语句没有像您预期的那样工作得很好。默认情况下，模拟的customerService返回null。这就是为什么你的回复是空的。所以你必须纠正参数匹配器，使它。