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。

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1 构建一个简单的maven项目

file -> project -> Maven-> next
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填写 Goupid Artifactid -> Next
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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。

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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));
    }
}