JUnit 测试错误：java.lang.AssertionError：“andExpect”的 JSON 路径“$.id”处没有值

Question

所以我正在为一个简单的 Post 方法控制器编写一个 Junit。我编写了以下 Junit，它抛出了一个错误： 我这里有考试 这是我写的 Jnit 代码：看起来有什么问题吗？

@Test
    public void testCreateCar() throws Exception {

      String custJson = "{\"name\": \"John Doe\", " +
                        "\"street\": \"123 Main St\", " +
                        "\"house_No\": \"45B\", " +
                        "\"place\": \"Springfield\", " +
                        "\"email\": \"[email protected]\", " +
                        "\"ph_Number\": \"1234567890\"}";
      
      
    CustomerEntity customer = new CustomerEntity();
    customer.seters except ID...


    CustomerEntity customer2 = new CustomerEntity();
    customer2.setters.....

    given(custService.createCust(customer)).willReturn(customer2);
    mvc.perform(MockMvcRequestBuilders.post("/api/createCust")
        .contentType(MediaType.APPLICATION_JSON).content(custJson))
        .andExpect(MockMvcResultMatchers.status().isOk())
        .andExpect(MockMvcResultMatchers.jsonPath("$.id").value(1))
        .andExpect(MockMvcResultMatchers.jsonPath("$.name").value("John Doe"))
        .andExpect(MockMvcResultMatchers.jsonPath("$.street").value("123 Main St"))
        .andExpect(MockMvcResultMatchers.jsonPath("$.house_No").value("45B"))
        .andExpect(MockMvcResultMatchers.jsonPath("$.place").value("Springfield"))
        .andExpect(MockMvcResultMatchers.jsonPath("$.email").value("[email protected]"))
        .andExpect(MockMvcResultMatchers.jsonPath("$.ph_Number").value("1234567890"));
    }

具有GenerateValue和ID的实体类

 @Entity
      public class CustomerEntity {

    public CustomerEntity(Integer id, String name, String street, String house_No, String place,
      @Email String email, @Pattern(regexp = "(^$|[0-9]{10})") String ph_Number) {
    super();
    this.id = id;
    this.name = name;
    this.street = street;
    this.house_No = house_No;
    this.place = place;
    this.email = email;
    this.ph_Number = ph_Number;
    }

//constructor
    public CustomerEntity() {}

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;
    private String name;
    private String street;
    private String house_No;
    private String place;
    @Email
    private String email;
    @Pattern(regexp = "(^$|[0-9]{10})")
    private String ph_Number;

带有端点的控制器：

    @PostMapping("/createCust")
    public ResponseEntity<CustomerEntity> createCust(@Valid @RequestBody CustomerEntity cust) {
    CustomerEntity customer = custService.createCust(cust);
    return ResponseEntity.status(HttpStatus.OK).body(customer);
    }

这是我的简单服务：

    public CustomerEntity createCust(CustomerEntity cust) {
    return custRepo.save(cust);
    }

测试出了什么问题？

错误：

     java.lang.AssertionError: No value at JSON path "$.id"  at org.springframework.test.util.JsonPathExpectationsHelper.evaluateJsonPath(JsonPathExpectationsHelper.java:302) at org.springframework.test.util.JsonPathExpectationsHelper.assertValue(JsonPathExpectationsHelper.java:99) at org.springframework.test.web.servlet.result.JsonPathResultMatchers.lambda$value$2(JsonPathResultMatchers.java:111) at org.springframework.test.web.servlet.MockMvc$1.andExpect(MockMvc.java:214) at com.rupesh.assesment.carlease.controller.CustomerControllerTest.testCreateCar(CustomerControllerTest.java:57) at java.base/java.lang.reflect.Method.invoke(Method.java:580)  at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)  at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)  Caused by: java.lang.IllegalArgumentException: json can not be null or empty  at com.jayway.jsonpath.internal.Utils.notEmpty(Utils.java:401)  at com.jayway.jsonpath.JsonPath.read(JsonPath.java:390)  at com.jayway.jsonpath.JsonPath.read(JsonPath.java:377)  at org.springframework.test.util.JsonPathExpectationsHelper.evaluateJsonPath(JsonPathExpectationsHelper.java:299) ... 7 more

Answer 1

原因是你的控制器带有

@Controller

注释。您必须使用

@RestController

注释来使控制器返回 JSON。