使用Mockito和MockMvc的方法中缺少的代码属性

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.web.servlet.MockMvc;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

@ExtendWith(MockitoExtension.class)
@SpringBootTest
@AutoConfigureMockMvc
public class UserControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @Mock
    private UserService userService;

    @Test
    public void testGetUser() throws Exception {
        User user = new User("John", "Doe");
        Mockito.when(userService.getUser(1L)).thenReturn(user);

        mockMvc.perform(get("/users/1"))
                .andExpect(status().isOk());
    }
}