使用MockMvc和junit5测试LocalDate时的AssertionError

Question

我试图在spring boot 2.3项目中使用JUnit5与Hibernate5.4和MockMvc。

这就是我的employee实体类的成员的外观：

import java.time.LocalDate;
... (Rest of the imports)

@Entity
public class Employee {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long employeeId;

    @Column(nullable = false, updatable = true)
    private String firstName;

    @Column(nullable = true, updatable = true)
    private String lastName;

    @Column(nullable = false, updatable = true)
    private String email;

    @Column(nullable = false, updatable = true)
    private LocalDate birthDate;

我试图使用JUnit5用Mockito和MockMvc测试LocalDate字段birthDate。这就是测试用例的样子：

    @Test
    public void testFindEmployeeById() throws Exception {
        Employee mockedEmployee = makeEmployee(9L, "Mock First", "Mock Last", "[e-mail]",
                LocalDate.of(1996, 9, 8), 9L, "Mock Project", "Mock Department");

        Mockito.when(employeeRepositoryMock.findById(mockedEmployee.getEmployeeId()))
                .thenReturn(Optional.of(mockedEmployee));

        mockMvc.perform(MockMvcRequestBuilders.get("/v1/employees/id/9").accept(MediaType.APPLICATION_JSON))
                .andDo(MockMvcRestDocumentation.document("employeeById",
                        Preprocessors.preprocessRequest(Preprocessors.prettyPrint()),
                        PayloadDocumentation.responseFields(
                                PayloadDocumentation.fieldWithPath("employeeId").description("Employee ID"),
                                PayloadDocumentation.fieldWithPath("firstName").description("First Name"),
                                PayloadDocumentation.fieldWithPath("lastName").description("Last Name"),
                                PayloadDocumentation.fieldWithPath("email").description("Email Address"),
                                PayloadDocumentation.fieldWithPath("birthDate").description("Date of Birth"),
                                PayloadDocumentation.fieldWithPath("project.projectId").description("Project ID"),
                                PayloadDocumentation.fieldWithPath("project.name").description("Project name"),
                                PayloadDocumentation.fieldWithPath("project.department.departmentId")
                                        .description("Department ID"),
                                PayloadDocumentation.fieldWithPath("project.department.name")
                                        .description("Department Name"))))
                .andDo(print()).andExpect(MockMvcResultMatchers.status().isOk())
                .andExpect(MockMvcResultMatchers.jsonPath("$.employeeId").value(mockedEmployee.getEmployeeId()))
                .andExpect(MockMvcResultMatchers.jsonPath("$.firstName").value(mockedEmployee.getFirstName()))
                .andExpect(MockMvcResultMatchers.jsonPath("$.lastName").value(mockedEmployee.getLastName()))
                .andExpect(MockMvcResultMatchers.jsonPath("$.email").value(mockedEmployee.getEmail()))
                .andExpect(MockMvcResultMatchers.jsonPath("$.birthDate").value(mockedEmployee.getBirthDate()))
                .andExpect(MockMvcResultMatchers.jsonPath("$.project.projectId")
                        .value(mockedEmployee.getProject().getProjectId()))
                .andExpect(
                        MockMvcResultMatchers.jsonPath("$.project.name").value(mockedEmployee.getProject().getName()))
                .andExpect(MockMvcResultMatchers.jsonPath("$.project.department.departmentId")
                        .value(mockedEmployee.getProject().getDepartment().getDepartmentId()))
                .andExpect(MockMvcResultMatchers.jsonPath("$.project.department.name")
                        .value(mockedEmployee.getProject().getDepartment().getName()));
    }

运行测试用例时,我得到一个AssertionError：

java.lang.AssertionError: JSON path "$.birthDate" expected:<1996-09-08> but was:<1996-09-08>

正如您所看到的，这两个字符串表示形式是相同的。但是JUnit5会抛出错误。

那么，比较LocalDate和JUnit5的正确方法是什么呢？

在这里可以找到一个类似的问题：在Junit测试用例中使用Hamcrest比较LocalDate；在这里：测试SimpledateFormat时使用Junit AssertionError

提前道谢。：）

Answer 1

JsonPath对实际的JSON本身进行操作。此时，您的localdate已转换为JSONstring值。虽然有一个论点认为匹配器应该自动将Java值转换为字符串，但实际上并非如此，但如果您调用localdate.toString()，那么它应该可以工作。

（更一般地说，当您遇到匹配器错误，指出两个看起来相同的值不匹配时，可能是因为它们是不同的类型，具有公共的toString()格式。）