junit+maven单元测试

一、概念

junit是一个专门测试的框架

集合maven进行单元测试，可批量测试类中的大量方法是否符合预期

二、作用：
单元测试：测试的内容是类中的方法，每一个方法都是独立测试的。方法是测试的基本单位。

 

三、使用方法
1、pom内加入依赖

<dependency>
　　<groupId>junit</groupId>
　　<artifactId>junit</artifactId>
　　<version>4.11</version>
　　<scope>test</scope>
</dependency>

2、在maven中src/test/java目录下的，创建测试程序。
推荐的创建类和方法的提示：
1、测试类的名称：Test+待测试类名
2、测试方法的名称：Test+方法名称
例如：你要测试HelloMaven
创建测试类TestHelloMaven
@Test
public void testaDD(){
测试HelloMaven的add方法是否正确
}
其中testAdd叫做测试方法，定义规则：
1、方法必须是public的
2、方法必须没有返回值
3、方法名称自定义，推荐是Test+被测方法
4、方法上面加上注解@Test

 

四、举例，Hello项目

1、新建java源程序，存放在Hello\src\main\java\com\testbk目录下，取名HelloMaven.java

package com.testbk; import org.junit.Assert; import org.junit.Test; public class TestHelloMaven{ @Test public void testAdd(){ System.out.println("maven junit testAdd()===") HelloMaven hello = new HelloMaven(); int res = hello.add(10,20); //验证10+20是不是30，juit提供的方法，对比结果的 //assertEquals(期望值，实际值)
        Assert.assertEquals(30,res) } }

2、新建maven测试类型，存放在Hello\src\main\java\com\testbk目录下，取名TestHelloMaven.java

package com.testbk; import org.junit.Assert; import org.junit.Test; public class TestHelloMaven{ @Test public void testAdd(){ System.out.println("maven junit testAdd()===") HelloMaven hello = new HelloMaven(); int res = hello.add(10,20); //验证10+20是不是30，juit提供的方法，对比结果的 //assertEquals(期望值，实际值)
        Assert.assertEquals(30,res) } @Test public void testAdd2(){ System.out.println("#####maven junit testAdd()2###"); HelloMaven hello = new HelloMaven(); int res = hello.add(10,20); //验证10+20是不是30，juit提供的方法，对比结果的 //assertEquals(期望值，实际值)
        Assert.assertEquals(50,res); } }

3、执行mvn clean：清理target目录

[INFO] Scanning for projects... [INFO] [INFO] ------------------------< com.testbk:testjava >------------------------- [INFO] Building maven 0.0.1-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ testjava --- [INFO] Deleting D:\javaProjects\Hello\target [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 0.196 s [INFO] Finished at: 2021-04-25T22:50:10+08:00 [INFO] ------------------------------------------------------------------------

4、执行mvn compile：编译main/java目录下的java为class文件，同时把class拷贝到target/classes目录下面

[INFO] Scanning for projects... [INFO] [INFO] ------------------------< com.testbk:testjava >------------------------- [INFO] Building maven 0.0.1-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ testjava --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ testjava --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 1 source file to D:\javaProjects\Hello\target\classes [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 0.724 s [INFO] Finished at: 2021-04-25T22:54:23+08:00 [INFO] ------------------------------------------------------------------------

5、执行mvn test-compile:编译test/java目录下的java为class文件，同时class拷贝到target/test-classes目录下面

[INFO] Scanning for projects... [INFO] [INFO] ------------------------< com.testbk:testjava >------------------------- [INFO] Building maven 0.0.1-SNAPSHOT [INFO] --------------------------------[ jar ]--------------------------------- [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ testjava --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ testjava --- [INFO] Nothing to compile - all classes are up to date [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ testjava --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] Copying 0 resource [INFO] [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ testjava --- [INFO] Changes detected - recompiling the module! [INFO] Compiling 1 source file to D:\javaProjects\Hello\target\test-classes [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 0.764 s [INFO] Finished at: 2021-04-25T22:55:43+08:00 [INFO] ------------------------------------------------------------------------

6、执行mvn test：查看测试结果，通过1，失败1，并在指定目录生成测试报告

Results : Failed tests: testAdd2(com.testbk.TestHelloMaven): expected:<50> but was:<30> Tests run: 2, Failures: 1, Errors: 0, Skipped: 0 [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 1.050 s [INFO] Finished at: 2021-04-25T22:57:16+08:00 [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.12.4:test (default-test) on project testjava: There are test failures. [ERROR] [ERROR] Please refer to D:\javaProjects\Hello\target\surefire-reports for the individual test results. [ERROR] -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

7、修改测试代码，并再次执行mvn test

package com.testbk; import org.junit.Assert; import org.junit.Test; public class TestHelloMaven{ @Test public void testAdd(){ System.out.println("=====maven junit testAdd()==="); HelloMaven hello = new HelloMaven(); int res = hello.add(10,20); //验证10+20是不是30，juit提供的方法，对比结果的 //assertEquals(期望值，实际值)
        Assert.assertEquals(30,res); } @Test public void testAdd2(){ System.out.println("#####maven junit testAdd()2###"); HelloMaven hello = new HelloMaven(); int res = hello.add(30,20); //验证10+20是不是30，juit提供的方法，对比结果的 //assertEquals(期望值，实际值)
        Assert.assertEquals(50,res); } }

查看运行结果，测试通过

 T E S T S ------------------------------------------------------- Running com.testbk.TestHelloMaven =====maven junit testAdd()=== #####maven junit testAdd()2### Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.034 sec Results : Tests run: 2, Failures: 0, Errors: 0, Skipped: 0 [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 1.282 s [INFO] Finished at: 2021-04-25T22:58:41+08:00 [INFO] ------------------------------------------------------------------------