变异测试工具Pitest（maven配置），并解决无法加载主类问题 INFO : MINION : Error: Could not find or load main class org.

本地电脑环境

window10
jdk1.8
maven 3.5.4
IDEA 2020.1

首先配置好maven环境

这里面有一些坑，可以看我的另一篇博客，踩过的坑希望大家不要在踩了。
https://blog.csdn.net/ibo123/article/details/108034402

无法加载主类的问题在于你的maven环境没有进行全局配置，请务必配置好全局maven。要不然IDEA会自动加载默认的maven。

1 构建一个简单的maven项目

file -> project -> Maven-> next

填写 Goupid Artifactid -> Next

项目名称和路径根据自己需要填写，最后点击Finish.

2 pom.xml设置

 <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.ibo.pit</groupId> <artifactId>pit_test</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <!-- 不设置scope就是全局--> <scope>test</scope> </dependency> <dependency> <groupId>org.pitest</groupId> <artifactId>pitest-maven</artifactId> <version>1.4.11</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.pitest</groupId> <artifactId>pitest-maven</artifactId> <version>1.4.11</version> <configuration> <targetClasses> <param>com.ibo.pit.*</param> </targetClasses> <targetTests> <param>com.ibo.test.*</param> </targetTests> <!-- <mutators>--> <!-- <mutator>CONSTRUCTOR_CALLS</mutator>--> <!-- <mutator>VOID_METHOD_CALLS</mutator>--> <!-- <mutator>RETURN_VALS</mutator>--> <!-- <mutator>NON_VOID_METHOD_CALLS</mutator>--> <!-- </mutators>--> </configuration> <executions> <execution> <id>pit-report</id> <!-- optional, this example attached the goal into mvn test phase --> <phase>test</phase> <goals> <goal>mutationCoverage</goal> </goals> </execution> </executions> </plugin> </plugins> </build> </project> 

3 在main->java和test->java下新建两个包，并在main创建java class。

calculate.java

public class calculate { public int add(int a, int b) { int result = a + b; return result; } public int subtract(int a, int b) { int result = a - b; return result; } public int multiply(int a, int b) { int result = a * b; return result; } public int divide(int a, int b) { int result = a / b; return result; } public int summation(int start){ int retVal = 0; while (start > 0 ){ retVal += start; start--; } return retVal; } public boolean isPositive(int number){ return number > 0; } public int compare(int a, int b){ int retVal = 0; if (a == b){ retVal = 0; }else if (a >= b){ retVal = 1; }else { retVal = -1; } return retVal; } public static void main(String[] args){ calculate c = new calculate(); int a = c.add(1,2); System.out.println(a); } } 

4 对calculate类生成单元测试,使用junit。

public class calculateTest { @Test public void add() { assertEquals(2,new calculate().add(1,1)); } @Test public void subtract() { assertEquals(1,new calculate().subtract(2,1)); } @Test public void multiply() { assertEquals(2,new calculate().multiply(1,2)); } @Test public void divide() { assertEquals(2,new calculate().divide(4,2)); } @Test public void summation() { assertEquals(3, new calculate().summation(2)); } @Test public void isPositive() { assertEquals(true, new calculate().isPositive(2)); } @Test public void compare() { assertEquals(-1, new calculate().compare(-1,0)); } } 

5 运行calculateTest,确保单元测试通过。

6 IDEA终端 mvn clean

7 mvn clean test

默认Pitest生成html报告，此报告在target/pit-reports里面找到。

可以根据此报告来修改代码和测试用例，达到100%代码覆盖，和较高的mutation coverage。

本文地址：https://blog.csdn.net/ibo123/article/details/108037087