Spring、Spring Boot集成JUnit单元测试和MockMvc

一.JUnit介绍

JUnit是Java中最有名的单元测试框架，用于编写和运行可重复的测试，多数Java的开发环境都已经集成了JUnit作为单元测试的工具。好的单元测试能极大的提高开发效率和代码质量。

测试类命名规则：被测试类+Test，如UserServiceTest
测试用例命名规则：test+用例方法，如testGet

Maven导入junit、sprint-test 、json-path相关测试包，并配置maven-suerfire-plugin插件，编辑pom.xml

    <dependencies>
        
        <dependency>
            <groupId>junitgroupId>
            <artifactId>junitartifactId>
            <version>4.12version>
            <scope>testscope>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-testartifactId>
            <version>4.3.10.RELEASEversion>
            <scope>testscope>
        dependency>
        
        <dependency>
            <groupId>com.jayway.jsonpathgroupId>
            <artifactId>json-pathartifactId>
            <version>2.4.0version>
            <scope>testscope>
        dependency>
    dependencies>
    <build>
        <plugins>
            
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-surefire-pluginartifactId>
                <version>2.20version>
                <dependencies>
                    <dependency>
                        <groupId>org.apache.maven.surefiregroupId>
                        <artifactId>surefire-junit4artifactId>
                        <version>2.20version>
                    dependency>
                dependencies>
                <configuration>
                    
                    <skipTests>falseskipTests>
                    
                    <excludes>
                        <exclude>**/Base*exclude>
                    excludes>
                configuration>
            plugin>
        plugins>
    build>

二.Spring Service层集成JUnit和MockMVC

创建Service层测试基类，新建BaseServiceTest.java

// 配置Spring中的测试环境
@RunWith(SpringJUnit4ClassRunner.class)
// 指定Spring的配置文件路径
@ContextConfiguration(locations = {"classpath*:/spring/applicationContext.xml"})
// 测试类开启事务,需要指定事务管理器,默认测试完成后,数据库操作自动回滚
@Transactional(transactionManager = "transactionManager")
// 指定数据库操作不回滚,可选
@Rollback(value = false)
public class BaseServiceTest {
}

测试UserService类，新建测试类UserServiceTest.java

public class UserServiceTest extends BaseServiceTest {

    private static final Logger LOGGER = LoggerFactory.getLogger(UserServiceTest.class);

    @Resource
    private UserService userService;

    @Test
    public void testGet() {
        UserDO userDO = userService.get(1);

        Assert.assertNotNull(userDO);
        LOGGER.info(userDO.getUsername());

        // 增加验证断言
        Assert.assertEquals("testGet faield", "Google", userDO.getUsername());
    }
}

三.Spring Controller层集成JUnit和MockMVC

创建Controller层测试基类，新建BaseControllerTest.java

// 配置Spring中的测试环境
@RunWith(SpringJUnit4ClassRunner.class)
// 指定测试环境使用的ApplicationContext是WebApplicationContext类型的
// value指定web应用的根
@WebAppConfiguration(value = "src/main/webapp")
// 指定Spring容器层次和配置文件路径
@ContextHierarchy({
        @ContextConfiguration(name = "parent", locations = {"classpath*:/spring/applicationContext.xml"}),
        @ContextConfiguration(name = "child", locations = {"classpath*:/spring/applicationContext_mvc.xml"})
})
// 测试类开启事务,需要指定事务管理器,默认测试完成后,数据库操作自动回滚
@Transactional(transactionManager = "transactionManager")
// 指定数据库操作不回滚,可选
@Rollback(value = false)
public class BaseControllerTest {
}

测试IndexController类，新建测试类IndexControllerTest.java

public class IndexControllerTest extends BaseControllerTest {

    private static final Logger LOGGER = LoggerFactory.getLogger(UserServiceTest.class);

    // 注入webApplicationContext
    @Resource
    private WebApplicationContext webApplicationContext;

    private MockMvc mockMvc;

    // 初始化mockMvc,在每个测试方法前执行
    @Before
    public void setup() {
        this.mockMvc = MockMvcBuilders.webAppContextSetup(this.webApplicationContext).build();
    }

    @Test
    public void testIndex() throws Exception {
        /**
         * mockMvc.perform()执行一个请求
         * get("/server/get")构造一个请求
         * andExpect()添加验证规则
         * andDo()添加一个结果处理器
         * andReturn()执行完成后返回结果
         */
        MvcResult result = mockMvc.perform(get("/server/get")
                .param("id", "1"))
                .andExpect(MockMvcResultMatchers.status().isOk())
                .andExpect(MockMvcResultMatchers.jsonPath("$.username").value("Google"))
                .andDo(print())
                .andReturn();

        LOGGER.info(result.getResponse().getContentAsString());

        // 增加验证断言
        Assert.assertNotNull(result.getResponse().getContentAsString());
    }
}

四.Spring Boot Controller层集成JUnit和MockMVC

@RunWith(SpringJUnit4ClassRunner.class)
// 开启web上下文测试
@WebAppConfiguration
// 加入配置启动类
@SpringBootTest(classes = {MicroServiceItemApp.class})
public class ItemControllerTest{
    @Autowired
    private WebApplicationContext webApplicationContext;

    private MockMvc mockMvc;

    @Test
    public void testGetId() throws Exception {
        mockMvc.perform(MockMvcRequestBuilders.get("/item/2")).andExpect(MockMvcResultMatchers.status().isOk()).andDo(MockMvcResultHandlers.print());
    }
}