<properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.3.7.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

@ExtendWith({SpringExtension.class})
@WebMvcTest
public class SimpleControllerTest {

    @Autowired
    MockMvc mockMvc;

    @MockBean
    private SimpleService simpleService;

}

@Service
public class SimpleService {

}

    @Test
    void testFindAllSimples() throws Exception {
        List<Simple> simpleList = new ArrayList<>();
        simpleList.add(new Simple(1L,"one"));
        simpleList.add(new Simple(2L,"two"));
        when(simpleService.findAll()).thenReturn(simpleList);

        mockMvc.perform(MockMvcRequestBuilders.get("/simples")
                .contentType(MediaType.APPLICATION_JSON)).andExpect(jsonPath("$", hasSize(2))).andDo(print());
    }

@Entity
public class Simple {
    private Long id;
    private String desc;
    
    public Simple(String desc) {
        this.desc = desc;
    }
    
}

    public List<Simple> findAll() {
        return new ArrayList<>();
    }

java.lang.AssertionError: No value at JSON path “$”

@RestController
public class SimpleController {

    @Autowired
    private SimpleService simpleService;

    @GetMapping("/simples")
    public ResponseEntity<List<Simple>> getAllSimples() {
        return new ResponseEntity<>(simpleService.findAll(), HttpStatus.OK);

    }
}

@SpringBootTest
public class SimpleServiceTest {

    @MockBean
    private SimpleRepository simpleRepository;

}

@Repository
public interface SimpleRepository extends JpaRepository<Simple,Long> {
}

    @Test
    void testFindAll() {
        Simple simple = new Simple("one");
        simpleRepository.save(simple);
        SimpleService simpleService = new SimpleService(simpleRepository);
        List<Simple> simples = simpleService.findAll();
        Simple entity = simples.get(simples.size() - 1);
        assertEquals(simple.getDesc(),entity.getDesc());
        assertEquals(simple.getId(),entity.getId());
    }

@Service
public class SimpleService {

    private SimpleRepository simpleRepository;



    public SimpleService(SimpleRepository simpleRepository) {
        this.simpleRepository = simpleRepository;
    }

    public List<Simple> findAll() {
        return new ArrayList<>();
    }
}

@Entity
public class Simple {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String desc;

    public Simple() {
    }

    public Simple(String desc) {
        this.desc = desc;
    }

   // 省略 getter/setter ...
   

}

    public List<Simple> findAll() {
        return simpleRepository.findAll();
    }

@SpringBootTest
public class SimpleServiceTest {

    @Autowired
    private SimpleRepository simpleRepository;

    @Test
    void testFindAll() {
        Simple simple = new Simple("one");
        simpleRepository.save(simple);
        SimpleService simpleService = new SimpleService(simpleRepository);
        List<Simple> simpleEntities = simpleService.findAll();
        Simple entity = simpleEntities.get(simpleEntities.size() - 1);
        assertEquals(simple.getDesc(),entity.getDesc());
        assertEquals(simple.getId(),entity.getId());
    }
}

#************H2  Begin****************
#創(chuàng)建表的MySql語(yǔ)句位置
spring.datasource.schema=classpath:schema.sql
#插入數(shù)據(jù)的MySql語(yǔ)句的位置
spring.datasource.data=classpath:data.sql
# 禁止自動(dòng)根據(jù)entity創(chuàng)建表結(jié)構(gòu)，表結(jié)構(gòu)由schema.sql控制
spring.jpa.hibernate.ddl-auto=none

spring.jpa.show-sql=true

DROP TABLE IF EXISTS simple;

CREATE TABLE `simple` (
 id  BIGINT(20) auto_increment,
 desc varchar(255)
);

INSERT INTO `simple`(`desc`) VALUES ('test1');
INSERT INTO `simple`(`desc`) VALUES ('test2');

[
    {
		"id": 1,
		"desc": "test1"
	},
	{
		"id": 2,
		"desc": "test2"
	}
]