一注解说明

@SpringBootTest注解是扫描配置来构建测试用的Spring上下文环境。
@RunWith注解声明测试是在spring环境下运行的，其必须要有一个构造器的类才能运行。
SpringRunner.class是继承SpringJUnit4ClassRunner，主要作用是spring集成junit单元测试类。

二 顶级类测试

2.1引入单元测试依赖

	<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test-autoconfigure</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- spring 5.0 webflux​-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webflux</artifactId>
        </dependency>​

2.2 创建包结构

注意哦，在测试类的java目录下和main子目录的java目录下，其最顶级的启动类包结构应该相同，否则要加包扫描注解。
本次示例先演示没有启动类的情况。

2.3 创建顶级类

/**
 * @Author lsc
 * @Description <p> 顶级类</p>
 * @Date 2019/10/20 18:14
 * @Version 1.0
 */

public class TestConfig {

    public String getUser(){
        return "youku1327";
    }
}

2.4 顶级类测试示例

/**
 * @Author lsc
 * @Description <p> </p>
 * @Date 2019/10/20 17:36
 * @Version 1.0
 */
@RunWith(SpringRunner.class)
// 如果没有main主类，是顶级类要指定classes
@SpringBootTest(classes = TestConfig.class)
public class Youku1Test {

    @Test
    public void test(){
        TestConfig testConfig = new TestConfig();
        String user = testConfig.getUser();
        // youku1327
        System.out.println(user);
    }
}

三 MockMvc 测试

3.1 创建controller层类

/**
 * @Author lsc
 * @Description <p> </p>
 * @Date 2019/10/20 18:53
 * @Version 1.0
 */
@RestController
public class TestController {

    @GetMapping("youku1327")
    public String getUser(){
        return "Hello World youku1327";
    }
}

3.2 创建主启动类

/**
 * @Author lsc
 * @Description <p> </p>
 * @Date 2019/10/20 18:45
 * @Version 1.0
 */
@SpringBootApplication
public class TestApplication {

    public static void main(String[] args) {

        SpringApplication.run(TestApplication.class,args);
    }
}

3.3 MockMvc测试示例

/**
 * @Author lsc
 * @Description <p> web 测试 </p>
 * @Date 2019/10/20 18:33
 * @Version 1.0
 */
@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureMockMvc
public class WebTest {

    @Autowired
    private MockMvc mvc;

    @Test
    public void exampleTest() throws Exception {
        // get请求  rui /youku1327 状态 200 期望值 Hello World youku1327
        ResultActions resultActions = this.mvc.perform(get("/youku1327")).andExpect(status().isOk())
                .andExpect(content().string("Hello World youku1327"));

    }

}

四 webClient测试示例

在步骤三的基础上进行测试。

/**
 * @Author lsc
 * @Description <p> </p>
 * @Date 2019/10/20 19:00
 * @Version 1.0
 */
@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureWebTestClient
@WebFluxTest(TestController.class)
public class WebClientTest {

   WebTestClient webClient = WebTestClient.bindToController(new TestController()).build();

    /*@Autowired
    private WebTestClient webClient;*/

    @Test
    public void exampleTest() {

        EntityExchangeResult<String> entityExchangeResult = webClient.get().uri("/youku1327").exchange().expectStatus().isOk()
                .expectBody(String.class).returnResult();
        // Hello World youku1327
        System.out.println(entityExchangeResult.getResponseBody());
    }
}

五 WebClient随机端口测试示例

/**
 * @Author lsc
 * @Description <p> </p>
 * @Date 2019/10/20 19:27
 * @Version 1.0
 */
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class webReadomTest {

    @Autowired
    private WebTestClient webClient;

    @Test
    public void exampleTest() {
        EntityExchangeResult<String> entityExchangeResult = this.webClient.get()
                .uri("/youku1327").exchange().expectStatus().isOk()
                .expectBody(String.class).returnResult();
        // Hello World youku1327
        System.out.println(entityExchangeResult.getResponseBody());
    }

}

六 TestRestTemplate测试示例

/**
 * @Author lsc
 * @Description <p> </p>
 * @Date 2019/10/20 19:39
 * @Version 1.0
 */
@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class RestTest {

    @Autowired
    private TestRestTemplate restTemplate;

    @Test
    public void exampleTest() {
        String body = this.restTemplate.getForObject("/youku1327", String.class);
        //Hello World youku1327
        System.out.println(body);
    }
}

七 更多测试

更多测试信息请查看官网指南
https://docs.spring.io/spring-boot/docs/2.1.1.RELEASE/reference/html/