一  junit单元测试

1.1 单元测试作用

单元测试要满足AIR原则，即

A： automatic 自动化；

I: Independent  独立性；

R：Repeatable 可重复；

2.单元测试必须使用assert来验证

1.2 案例1 常规单元测试

1.代码

public class CalcDemo {     public int add(int x ,int y)     {         return x + y;         //return x * y;     }      public int sub(int x ,int y)     {         return x - y;     } }

2.测试

public class AppTest   {     @Test     void sub()     {         CalcDemo calcDemo = new CalcDemo();         int retValue = calcDemo.sub(2, 2);         assertEquals(0,retValue);         System.out.println("");     } }

1.3 案例2 单元覆盖率Coverage*

1.代码

public class ScoreDemo {     public String scoreLevel(int score)     {         if(score <= 0) {             throw new IllegalArgumentException("缺考");         } else if (score < 60) {             return "弱";         } else if (score < 70) {             return "差";         } else if (score <= 80) {             return "中";         } else if (score < 90) {             return "良";         } else {             return "优";         }     } }

2.测试

class ScoreDemoTest {     @Test     void scoreLevel()     {         ScoreDemo scoreDemo = new ScoreDemo();         assertEquals("弱",scoreDemo.scoreLevel(52));     }      @Test     void scoreLevelv2()     {         ScoreDemo scoreDemo = new ScoreDemo();         assertEquals("差",scoreDemo.scoreLevel(62));     }      @Test     void scoreLevelv3()     {         ScoreDemo scoreDemo = new ScoreDemo();         assertEquals("中",scoreDemo.scoreLevel(80));     }      @Test     void scoreLevelv4()     {         ScoreDemo scoreDemo = new ScoreDemo();         assertThrows(IllegalArgumentException.class,() -> scoreDemo.scoreLevel(-7));     } }

查看测试报告：对应覆盖率

1.4 案例3 BeforeEach，BeforeAfterall

1.代码

public class CalcDemo {     public int add(int x ,int y)     {         return x + y;         //return x * y;     }      public int sub(int x ,int y)     {         return x - y;     } } 

2.测试 

class CalcDemoTestV2 {     CalcDemo calcDemo = null;      static StringBuffer stringBuffer = null;      @BeforeAll     static void m1()     {         stringBuffer = new StringBuffer("abc");         System.out.println("===============: "+stringBuffer.length());     }      @AfterAll     static void m2()     {         System.out.println("===============: "+stringBuffer.append(" ,end").toString());     }        @BeforeEach     void setUp()     {         System.out.println("----come in BeforeEach");         calcDemo = new CalcDemo();     }      @AfterEach     void tearDown()     {         System.out.println("----come in AfterEach");         calcDemo = null;     }      @Test     void add()     {         assertEquals(5,calcDemo.add(1,4));         assertEquals(5,calcDemo.add(2,3));     }      @Test     void sub()     {         assertEquals(5,calcDemo.sub(10,5));     } }

3.结果

1.5 案例4  junit+反射+注解实现测试

1.定义注解

@Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) public @interface AtguiguTest { }

2.定义调用类

public class CalcHelpDemo {     public int mul(int x ,int y)     {         return x * y;     }      @AtguiguTest     public int div(int x ,int y)     {         return x / y;     }     @AtguiguTest     public void thank(int x ,int y)     {         System.out.println("3ks，help me test bug");     } } 

3.定义测试类

@Slf4j public class AutoTestClient {     public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException     {         //家庭作业，抽取一个方法，（class，p....）         CalcHelpDemo calcHelpDemo = new CalcHelpDemo();         int para1 = 10;         int para2 = 0;           Method[] methods = calcHelpDemo.getClass().getMethods();         AtomicInteger bugCount = new AtomicInteger();         // 要写入的文件路径（如果文件不存在，会创建该文件）         String filePath = "BugReport"+ (DateUtil.format(new Date(), "yyyyMMddHHmmss"))+".txt";           for (int i = 0; i < methods.length; i++)         {             if (methods[i].isAnnotationPresent(AtguiguTest.class))             {                 try                 {                     methods[i].invoke(calcHelpDemo,para1,para2);//放行                 } catch (Exception e) {                     bugCount.getAndIncrement();                     log.info("异常名称:{},异常原因:{}",e.getCause().getClass().getSimpleName(),e.getCause().getMessage());                       FileUtil.writeString(methods[i].getName()+"\t"+"出现了异常"+"\n", filePath, "UTF-8");                     FileUtil.appendString("异常名称:"+e.getCause().getClass().getSimpleName()+"\n", filePath, "UTF-8");                     FileUtil.appendString("异常原因:"+e.getCause().getMessage()+"\n", filePath, "UTF-8");                 }finally {                     FileUtil.appendString("异常数:"+bugCount.get()+"\n", filePath, "UTF-8");                 }             }         }     } }

4.查看结果

1.6 案例5  web工程单元测试

1.pom配置

                                 org.springframework.boot                 spring-boot-starter-test                 test                                           org.springframework.boot                 spring-boot-starter-web                                                        org.springframework.boot                 spring-boot-starter-test                 test             

2.处理类

@Service public class MemberService {     public String add(Integer uid)     {         System.out.println("---come in addUser,your uid is: "+uid);         if (uid == -1)         {             throw new IllegalArgumentException("parameter is negative。。。。");         }         return "ok";     }      public int del(Integer uid)     {         System.out.println("---come in del,your uid is: "+uid);          return uid;     } } 

3.启动类

@SpringBootApplication public class App  {     public static void main( String[] args )     {         SpringApplication.run(App.class, args);         System.out.println( "Hello World!" );     } }

4.测试类

@SpringBootTest public class MemberTest {      @Resource //真实调用，落盘mysql-MQ=redis。。。。测试条件充分的情况下     private MemberService memberService1;  //    @Test //    void m1() //    { //        String result = memberService1.add(2); //        assertEquals("ok",result); // //        System.out.println("----m1 over"); //    }      @MockBean     private MemberService memberService2;  //    @Test //    void m2_NotMockRule() //    { //        String result = memberService2.add(2); //        assertEquals("ok",result); // //        System.out.println("----m2_NotMockRule over"); //    }  //    @Test //    void m2_WithMockRule() //    { //        when(memberService2.add(3)).thenReturn("ok");//不真的进入数据库/MQ，不落盘，改变return // //        String result = memberService2.add(3); //        assertEquals("ok",result); // //        System.out.println("----m2_WithMockRule over"); //    } @SpyBean //有规则按照规则走，没有规则走真实 private MemberService memberService3;     @Test     void m3()     {         when(memberService3.add(2)).thenReturn("ok");         String result = memberService3.add(2);         System.out.println("----add result:  "+result);         Assertions.assertEquals("ok",result);          int result2 = memberService3.del(3);         System.out.println("----del result2:  "+result2);         Assertions.assertEquals(3,result2);  //跨部门调用，不是写代码，累的是心，协调工作。    zzyybs@126.com         System.out.println("----over");     } } 

4.结果