覆盖生成器Minion由于UNKNOWN_ERROR -- IntelliJ IDE的插孔而异常退出。

Question

我得到了这个错误，使用了IntelliJ IDE中的PIT工具插件作为一个简单的程序，我使用的是maven，我也使用Junit4。是什么问题导致了错误，我该如何解决呢？

11:44:53 AM PIT >> INFO : Incremental analysis reduced number of mutations by 0
11:44:53 AM PIT >> INFO : Created  1 mutation test units in pre scan
11:44:54 AM PIT >> INFO : Sending 2 test classes to minion
11:44:54 AM PIT >> INFO : Sent tests to minion
11:44:54 AM PIT >> SEVERE : Coverage generator Minion exited abnormally due to UNKNOWN_ERROR
Exception in thread "main" org.pitest.util.PitError: Coverage generation minion exited abnormally!
Please copy and paste the information and the complete stacktrace below when reporting an issue
VM : OpenJDK 64-Bit Server VM
Vendor : Oracle Corporation
Version : 15.0.1+9-18
Uptime : 2238
Input ->
 1 : -javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.2.3\lib\idea_rt.jar=53726:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.2.3\bin
 2 : -Dfile.encoding=UTF-8
BootClassPathSupported : false
Please copy and paste the information and the complete stacktrace below when reporting an issue
VM : OpenJDK 64-Bit Server VM
Vendor : Oracle Corporation
Version : 15.0.1+9-18
Uptime : 2240
Input ->
 1 : -javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.2.3\lib\idea_rt.jar=53726:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.2.3\bin
 2 : -Dfile.encoding=UTF-8
BootClassPathSupported : false
    at org.pitest.util.Unchecked.translateCheckedException(Unchecked.java:20)
    at org.pitest.coverage.execute.DefaultCoverageGenerator.calculateCoverage(DefaultCoverageGenerator.java:106)
    at org.pitest.coverage.execute.DefaultCoverageGenerator.calculateCoverage(DefaultCoverageGenerator.java:52)
    at org.pitest.mutationtest.tooling.MutationCoverage.runAnalysis(MutationCoverage.java:149)
    at org.pitest.mutationtest.tooling.MutationCoverage.runReport(MutationCoverage.java:139)
    at org.pitest.mutationtest.tooling.EntryPoint.execute(EntryPoint.java:123)
    at org.pitest.mutationtest.tooling.EntryPoint.execute(EntryPoint.java:54)
    at org.pitest.mutationtest.commandline.MutationCoverageReport.runReport(MutationCoverageReport.java:98)
    at org.pitest.mutationtest.commandline.MutationCoverageReport.main(MutationCoverageReport.java:45)
Caused by: org.pitest.util.PitError: Coverage generation minion exited abnormally!
Please copy and paste the information and the complete stacktrace below when reporting an issue
VM : OpenJDK 64-Bit Server VM
Vendor : Oracle Corporation
Version : 15.0.1+9-18
Uptime : 2238
Input ->
 1 : -javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.2.3\lib\idea_rt.jar=53726:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.2.3\bin
 2 : -Dfile.encoding=UTF-8
BootClassPathSupported : false
    at org.pitest.coverage.execute.DefaultCoverageGenerator.gatherCoverageData(DefaultCoverageGenerator.java:148)
    at org.pitest.coverage.execute.DefaultCoverageGenerator.calculateCoverage(DefaultCoverageGenerator.java:90)
    ... 7 more```
  
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Answer 1

在寻找了无处不在的解决方案之后，我发现PIT的最新版本只适用于Junit5。所以，我通过迁移到JUnit5来解决这个问题

如果使用的是maven，请将以下行添加到pom文件中：

<properties>
        <junit.jupiter.version>5.8.1</junit.jupiter.version>
        <junit.platform.version>1.8.1</junit.platform.version>
      </properties>
      
      <dependencies>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <version>${junit.jupiter.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>${junit.jupiter.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-params</artifactId>
            <version>${junit.jupiter.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.platform</groupId>
            <artifactId>junit-platform-suite</artifactId>
            <version>${junit.platform.version}</version>
            <scope>test</scope>
        </dependency>

    </dependencies>