单测入门案例：JUnit+Mockito

导入依赖

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.21.0</version>
            </plugin>
            <plugin>
                <groupId>org.jacoco</groupId>
                <artifactId>jacoco-maven-plugin</artifactId>
                <version>0.8.11</version>
                <executions>
                    <execution>
                        <id>prepare-agent</id>
                        <goals>
                            <goal>prepare-agent</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>post-unit-test</id>
                        <phase>test</phase>
                        <goals>
                            <goal>report</goal>
                        </goals>
                        <configuration>
                            <dataFile>target/jacoco.exec</dataFile>
                            <outputDirectory>target/jacoco-ut</outputDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

		<dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-core</artifactId>
        <version>3.9.0</version>
      </dependency>
      <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-inline</artifactId>
        <version>3.9.0</version>
      </dependency>

具体实现

1.声明类

@RunWith(MockitoJUnitRunner.class)
public class UnitServiceImplTest {

	//mock被单测的service
	@InjectMocks
    private UnitServiceImpl unitService;

	//mock被单测的service里注入的其他bean
    @Mock
    private UserService userService;

	//mock被单测的service里注入的其他bean
    @Mock
    private EsSearchStaffService esSearchStaffService;

	//这里面写具体的单测方法
 	@Test
    public void getUserInfoByYhtUserId(){
    	
    }
}

2.常量正常声明即可

	String keyword = "秦";
    List<String> userIdList = new ArrayList<>();

3.mock静态方法

	MockedStatic<InvocationInfoProxy> invocationInfoProxyMockedStatic = Mockito.mockStatic(InvocationInfoProxy.class);
	String userId = InvocationInfoProxy.getUserId();

4.mock外部调用、注入的service或者mapper

	Mockito.when(userService.getUserList(yhtUserIdList)).thenReturn(new ArrayList<>());
	Mockito.when(userMapper.getUserList(yhtUserIdList)).thenReturn(new ArrayList<>());            

5.mock异常

 	//这里模拟异常时必须抛具体的异常，直接抛Exception的话mockito会异常
	Mockito.when(userService.searchByUserIdsWithoutPower(userIdList, keyword)).thenThrow(new BusinessException());

6.mock异步方法

    @Mock
    ThreadPoolExecutor threadPoolExecutor;
    
    @Test
    public void getUserInfoByYhtUserId(){
    	//mock入参
    	List<String> userIdList = new ArrayList<>();
    	userIdList.add(1);
    	userIdList.add(2);
    	//调用被单测的方法里的异步逻辑的run方法
    	Mockito.doAnswer(
                (InvocationOnMock invocation) -> {
                    ((Runnable) invocation.getArguments()[0]).run();
                    return null;
                }
        ).when(threadPoolExecutor).execute(Mockito.any(Runnable.class));
        //执行单测方法
        unitService.getUserInfo(userIdList );
    }
	

常用命令

1、执行单测 mvn test
2、生成单测UI报告mvn jacoco:report
3、在idea执行单测方法看单测覆盖率