<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>
        
<dependency>
    <groupId>org.junit.platform</groupId>
    <artifactId>junit-platform-launcher</artifactId>
    <scope>test</scope>
</dependency>

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
}

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;
 
@SpringBootTest
@RunWith(SpringRunner.class)
public class ApplicationContextTests {
 
    @Autowired
    private ApplicationContext applicationContext;
 
    @Test
    public void testContextLoads() throws Throwable {
        Assert.assertNotNull(this.applicationContext);
    }
}

@SpringBootTest(classes = CustomerApplication.class, 
	webEnvironment = SpringBootTest.WebEnvironment.MOCK)

public class CustomTicket {
    private Long id;
    private Long accountId;    
    private String orderNumber;
    private String description;
    private Date createTime;
    public CustomTicket (Long accountId, String orderNumber) {
        super();
        Assert.notNull(accountId, "Account Id must not be null");
        Assert.notNull(orderNumber, "Order Number must not be null");
        Assert.isTrue(orderNumber.length() == 10, "Order Number must be exactly 10 characters");
        this.accountId = accountId;
        this.orderNumber = orderNumber;
    }
       …
}

@RunWith(SpringRunner.class)
public class CustomerTicketTests {
    private static final String ORDER_NUMBER = "Order00001";
    @Test
    public void testOrderNumberIsExactly10Chars() throws Exception {
        CustomerTicket customerTicket = new CustomerTicket(100L, ORDER_NUMBER);
        assertThat(customerTicket.getOrderNumber().toString()).isEqualTo(ORDER_NUMBER);
    }
}

<dependency>
       <groupId>com.h2database</groupId>
       <artifactId>h2</artifactId>
</dependency>
<dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <scope>runtime</scope>
</dependency>

DROP TABLE IF EXISTS `customerticket`;
create table `customerticket` (
	   `id` bigint(20) NOT NULL AUTO_INCREMENT,
	   `account_id` bigint(20) not null,
	   `order_number` varchar(50) not null,
	   `description` varchar(100) not null,
	    `create_time` timestamp not null DEFAULT CURRENT_TIMESTAMP,
	   PRIMARY KEY (`id`)
);

INSERT INTO customerticket (`account_id`, `order_number`,`description`) values (1, 'Order00001', ' DemoCustomerTicket1');

public interface CustomerTicketRepository extends JpaRepository<CustomerTicket, Long> {
    List<CustomerTicket> getCustomerTicketByOrderNumber(String orderNumber);
}

@RunWith(SpringRunner.class)
@DataJpaTest
public class CustomerRepositoryTest {
    @Autowired
    private TestEntityManager entityManager;
 
    @Autowired
    private CustomerTicketRepository customerTicketRepository;
 
    @Test
    public void testFindCustomerTicketById() throws Exception {             
        this.entityManager.persist(new CustomerTicket(1L, "Order00001", "DemoCustomerTicket1", new Date()));
        
        CustomerTicket customerTicket = this.customerTicketRepository.getOne(1L);
        assertThat(customerTicket).isNotNull();
        assertThat(customerTicket.getId()).isEqualTo(1L);
    }
        
    @Test
    public void testFindCustomerTicketByOrderNumber() throws Exception {    
        String orderNumber = "Order00001";
        
        this.entityManager.persist(new CustomerTicket(1L, orderNumber, "DemoCustomerTicket1", new Date()));
        this.entityManager.persist(new CustomerTicket(2L, orderNumber, "DemoCustomerTicket2", new Date()));
        
        List<CustomerTicket> customerTickets = this.customerTicketRepository.getCustomerTicketByOrderNumber(orderNumber);
        assertThat(customerTickets).size().isEqualTo(2);
        CustomerTicket actual = customerTickets.get(0);
        assertThat(actual.getOrderNumber()).isEqualTo(orderNumber);
    }
 
    @Test
    public void testFindCustomerTicketByNonExistedOrderNumber() throws Exception {              
        this.entityManager.persist(new CustomerTicket(1L, "Order00001", "DemoCustomerTicket1", new Date()));
        this.entityManager.persist(new CustomerTicket(2L, "Order00002", "DemoCustomerTicket2", new Date()));
        
        List<CustomerTicket> customerTickets = this.customerTicketRepository.getCustomerTicketByOrderNumber("Order00003");
        assertThat(customerTickets).size().isEqualTo(0);
    }
}

Hibernate: drop table customer_ticket if exists
Hibernate: drop sequence if exists hibernate_sequence
Hibernate: create sequence hibernate_sequence start with 1 increment by 1
Hibernate: create table customer_ticket (id bigint not null, account_id bigint, create_time timestamp, description varchar(255), order_number varchar(255), primary key (id))
Hibernate: create table localaccount (id bigint not null, account_code varchar(255), account_name varchar(255), primary key (id))
…
Hibernate: call next value for hibernate_sequence
Hibernate: call next value for hibernate_sequence
Hibernate: insert into customer_ticket (account_id, create_time, description, order_number, id) values (?, ?, ?, ?, ?)
Hibernate: insert into customer_ticket (account_id, create_time, description, order_number, id) values (?, ?, ?, ?, ?)
Hibernate: select customerti0_.id as id1_0_, customerti0_.account_id as account_2_0_, customerti0_.create_time as create_t3_0_, customerti0_.description as descript4_0_, customerti0_.order_number as order_nu5_0_ from customer_ticket customerti0_ where customerti0_.order_number=?
…
Hibernate: drop table customer_ticket if exists
Hibernate: drop sequence if exists hibernate_sequence

public interface Environment extends PropertyResolver {
    String[] getActiveProfiles();
    String[] getDefaultProfiles();
    boolean acceptsProfiles(String... profiles);
}

public interface PropertyResolver {
    boolean containsProperty(String key);
    String getProperty(String key);
    String getProperty(String key, String defaultValue);
    <T> T getProperty(String key, Class<T> targetType);
    <T> T getProperty(String key, Class<T> targetType, T defaultValue);
    String getRequiredProperty(String key) throws IllegalStateException;
    <T> T getRequiredProperty(String key, Class<T> targetType) throws IllegalStateException;
    String resolvePlaceholders(String text);
    String resolveRequiredPlaceholders(String text) throws IllegalArgumentException;
}

springcss.order.point = 10

@RunWith(SpringRunner.class)
@SpringBootTest
public class EnvironmentTests{
    @Autowired
    public Environment environment;
    @Test
    public void testEnvValue(){
        Assert.assertEquals(10, Integer.parseInt(environment.getProperty("springcss.order.point"))); 
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest(properties = {" springcss.order.point = 10"})
public class EnvironmentTests{
    @Autowired
    public Environment environment;
    @Test
    public void testEnvValue(){
        Assert.assertEquals(10, Integer.parseInt(environment.getProperty("springcss.order.point"))); 
    }
}

@Service
public class CustomerTicketService {
    @Autowired
    private CustomerTicketRepository customerTicketRepository;
    public CustomerTicket getCustomerTicketById(Long id) {
        return customerTicketRepository.getOne(id);
    }
    …
}

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.MOCK)
public class CustomerServiceTests {
    @MockBean
    private CustomerTicketRepository customerTicketRepository;
    @Test
    public void testGetCustomerTicketById() throws Exception {
        Long id = 1L;
       Mockito.when(customerTicketRepository.getOne(id)).thenReturn(new CustomerTicket(1L, 1L, "Order00001", "DemoCustomerTicket1", new Date()));
        CustomerTicket actual = customerTicketService.getCustomerTicketById(id);
        assertThat(actual).isNotNull();
        assertThat(actual.getOrderNumber()).isEqualTo("Order00001");
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class CustomerServiceTests {
    @Autowired
    private CustomerTicketRepository customerTicketRepository;
    @Test
    public void testGetCustomerTicketById() throws Exception {
        Long id = 1L;
        CustomerTicket actual = customerTicketService.getCustomerTicketById(id);
        assertThat(actual).isNotNull();
        assertThat(actual.getOrderNumber()).isEqualTo("Order00001");
    }
}

@Service
public class CustomerTicketService {
    @Autowired
    private OrderClient orderClient;
    private OrderMapper getRemoteOrderByOrderNumber(String orderNumber) {
        return orderClient.getOrderByOrderNumber(orderNumber);
    }
    …
}

@Component
public class OrderClient {
    @Autowired
    RestTemplate restTemplate;
    public OrderMapper getOrderByOrderNumber(String orderNumber) {
        ResponseEntity<OrderMapper> restExchange = restTemplate.exchange(
                "http://localhost:8083/orders/{orderNumber}", HttpMethod.GET, null,
                OrderMapper.class, orderNumber);
         OrderMapper result = restExchange.getBody();
        return result;
    }
}

@Test
public void testGenerateCustomerTicket() throws Exception {
        Long accountId = 100L;
        String orderNumber = "Order00001";
        Mockito.when(this.orderClient.getOrderByOrderNumber("Order00001"))
            .thenReturn(new OrderMapper(1L, orderNumber, "deliveryAddress"));
        Mockito.when(this.localAccountRepository.getOne(accountId))
            .thenReturn(new LocalAccount(100L, "accountCode", "accountName"));
 
        CustomerTicket actual = customerTicketService.generateCustomerTicket(accountId, orderNumber);
        assertThat(actual.getOrderNumber()).isEqualTo(orderNumber);
}

@RestController
@RequestMapping(value="customers")
public class CustomerController {
    @Autowired
    private CustomerTicketService customerTicketService; 
    @PostMapping(value = "/{accountId}/{orderNumber}")
    public CustomerTicket generateCustomerTicket( @PathVariable("accountId") Long accountId,
            @PathVariable("orderNumber") String orderNumber) {
        CustomerTicket customerTicket = customerTicketService.generateCustomerTicket(accountId, orderNumber);
        return customerTicket;
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class CustomerController2Tests { 
    @Autowired
    private TestRestTemplate testRestTemplate;
 
    @MockBean
    private CustomerTicketService customerTicketService;
 
    @Test
    public void testGenerateCustomerTicket() throws Exception {
        Long accountId = 100L;
        String orderNumber = "Order00001";
        given(this.customerTicketService.generateCustomerTicket(accountId, orderNumber))
                .willReturn(new CustomerTicket(1L, accountId, orderNumber, "DemoCustomerTicket1", new Date()));
 
        CustomerTicket actual = testRestTemplate.postForObject("/customers/" + accountId+ "/" + orderNumber, null, CustomerTicket.class);
        assertThat(actual.getOrderNumber()).isEqualTo(orderNumber);
    }
}

@RunWith(SpringRunner.class)
@WebMvcTest(CustomerController.class)
public class CustomerControllerTestsWithMockMvc { 
    @Autowired
    private MockMvc mvc;
 
    @MockBean
    private CustomerTicketService customerTicketService;
 
    @Test
    public void testGenerateCustomerTicket() throws Exception {
        Long accountId = 100L;
        String orderNumber = "Order00001";
        given(this.customerTicketService.generateCustomerTicket(accountId, orderNumber))
                .willReturn(new CustomerTicket(1L, 100L, "Order00001", "DemoCustomerTicket1", new Date()));
 
        this.mvc.perform(post("/customers/" + accountId+ "/" + orderNumber).accept(MediaType.APPLICATION_JSON)).andExpect(status().isOk());
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class CustomerControllerTestsWithAutoConfigureMockMvc {
 
    @Autowired
    private MockMvc mvc;
 
    @MockBean
    private CustomerTicketService customerTicketService;
 
    @Test
    public void testGenerateCustomerTicket() throws Exception {
        Long accountId = 100L;
        String orderNumber = "Order00001";
        given(this.customerTicketService.generateCustomerTicket(accountId, orderNumber))
                .willReturn(new CustomerTicket(1L, 100L, "Order00001", "DemoCustomerTicket1", new Date()));
 
        this.mvc.perform(post("/customers/" + accountId+ "/" + orderNumber).accept(MediaType.APPLICATION_JSON)).andExpect(status().isOk());
    }
}