Getting CustomMessageMissingMethodException when configuring gradle-pitest-plugin

Question

I'm trying to include mutation testing for my Android local UnitTests. I found https://pitest.org/ framework which I tried to include using the "officially" recommended gradle plugin from here: https://gradle-pitest-plugin.solidsoft.info/

Gradle Wrapper version: 6.5.1

But I can't figure out how to get it up and running. The docs on the plugins webpage are very fragmented and so I don't know if my gradle configuration is even correct.

My build.gradle file:

buildscript {
    ext.kotlin_version = '1.3.72'

    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.4'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'info.solidsoft.gradle.pitest:gradle-pitest-plugin:1.5.1'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

My build.gradle (app) file:

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'info.solidsoft.pitest'

android { ... }

dependencies { ... }

pitest {
    targetClasses = ['training.your.app.data.viewmodel.*']  
    pitestVersion = '1.5.1'
    threads = 4
    outputFormats = ['XML', 'HTML']
    timestampedReports = false
}

With this approach the IDE (AndroidStudio 4) gradle sync tells me:

Caused by: org.gradle.internal.metaobject.AbstractDynamicObject$CustomMessageMissingMethodException: Could not find method pitest() for arguments [build_w05scwyltsg8pepn5z5mp7e1$_run_closure3@651693d3] on project ':app' of type org.gradle.api.Project.

If I try to do it via gradlew pitest I get the same result.

My best guess is I'm lacking a lot of gradle knowledge. Any advise?

Answer 1

Thanks to henry's comment I was able to get pitest running with a fork of the gradle-pitest-plugin (https://github.com/koral--/gradle-pitest-plugin).

Long story short:

build.gradle

buildscript {
    ext.kotlin_version = '1.3.72'

    repositories {
        mavenCentral()
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.4'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'pl.droidsonroids.gradle:gradle-pitest-plugin:0.2.2'
    }
}

build.gradle (app)

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'pl.droidsonroids.pitest'

android { ... }

dependencies { ... }

pitest {
    reportDir = 'build/pitest/reports'
    targetClasses = ['training.your.app.data.viewmodel.*']
    threads = 6
    outputFormats = ['HTML']
    timeoutConstInMillis = 20000
    verbose = true
}

This won't work with Gradle version 6.5.1. The author of this plugin claims to have this issue fixed with the plugin version 0.2.4. But this version hasn't been published to maven central yet.

So use Gradle 6.3 with pl.droidsonroids.gradle:gradle-pitest-plugin:0.2.2 and you're good to go.