java - 如何在Spring boot Web应用程序方法的这个测试用例中省略NullPointerException？

Question

我的 Spring Web 应用程序方法中的重定向属性确实存在问题。方法如下:

@RequestMapping("/employee")
public String saveEmployee(@ModelAttribute EmployeeCommand commandObject){

    EmployeeCommand savedCommand = employeeService.saveEmployeeCommand(commandObject);

    return "redirect:/employee/" + savedCommand.getId();
}

我写了一个测试:

@Test
public void saveEmployee() throws Exception {

    //given
    EmployeeCommand employeeCommand = new EmployeeCommand();
    employeeCommand.setId(2L);

    //when
    when(employeeService.saveEmployeeCommand(employeeCommand)).thenReturn(employeeCommand);

    //then
    mockMvc.perform(post("/employee"))
            .andExpect(status().isOk());
            .andExpect(redirectedUrl("redirect:/employee/2"));

    verify(employeeService, times(1)).saveEmployeeCommand(employeeCommand);
}

我不断收到与该行相关的NullPointerException:

return "redirect:/employee/" + savedCommand.getId();

似乎savedCommand为空。有什么建议吗？

Answer 1

尝试使用

mockMvc.perform(post("/employee")).flashAttr("commandObject", employeeCommand));

现在您只执行 post 请求而不传递 commandObject，因此这个模拟:

when(employeeService.saveEmployeeCommand(employeeCommand)).thenReturn(employeeCommand);

不触发