build.gradle

buildscript {
  apply from: 'deps.gradle'
  repositories {
    google()
    jcenter()
  }
  dependencies {
    classpath deps.android_plugin
    classpath deps.kotlin_plugin
    classpath deps.coverallPlugin
    classpath deps.spotlessPlugin
    classpath deps.dokkaPlugin
  }
}

apply plugin: 'jacoco'
apply plugin: 'com.github.kt3k.coveralls'

repositories {
  jcenter()
}

//from https://gist.github.com/aalmiray/e6f54aa4b3803be0bcac
task jacocoTestReport {
  doLast {
    FileCollection executionData = files()

    subprojects.findAll { subproject ->
      subproject.pluginManager.hasPlugin('java') && subproject.pluginManager.hasPlugin('jacoco')
    }.each { subproject -> executionData += subproject.tasks.jacocoTestReport.executionData
    }

    executionData = files(executionData.findAll {
      it.exists()
    })

    ant.taskdef(name: 'jacocoReport', classname: 'org.jacoco.ant.ReportTask',
        classpath: configurations.jacocoAnt.asPath)

    ant.jacocoReport {
      executiondata {
        executionData.addToAntBuilder(ant, 'resources')
      }
      structure(name: project.name) {
        subprojects.findAll { subproject -> subproject.pluginManager.hasPlugin('java')
        }.each { subproject ->
          group(name: subproject.name) {
            classfiles {
              ((FileCollection) subproject.sourceSets.main.output).filter {
                it.exists()
              }.addToAntBuilder(ant, 'resources')
            }
            sourcefiles {
              files((Set<File>) subproject.sourceSets.main.allJava.srcDirs).filter {
                it.exists()
              }.addToAntBuilder(ant, 'resources')
            }
          }
        }
      }
      html(destdir: "${buildDir}/reports/jacoco/${name}/html")
      xml(destfile: "${buildDir}/reports/jacoco/${name}/${name}.xml")
      // Uncomment for CSV
      //csv(destfile: "${buildDir}/reports/jacoco/${name}/${name}.csv")
    }
  }
}

coveralls {
  jacocoReportPath = 'build/reports/jacoco/jacocoTestReport/jacocoTestReport.xml'
  sourceDirs = files(subprojects.collect { subproject -> "${subproject.projectDir}/src/main/java" }).files.absolutePath
}

tasks.coveralls {
  dependsOn 'jacocoTestReport'
}

subprojects { project ->
  group = GROUP
  version = VERSION_NAME

  repositories {
    jcenter()
  }

  apply plugin: 'jacoco'
  apply plugin: 'maven'
  apply plugin: 'com.diffplug.spotless'

  tasks.withType(JavaCompile) {
    options.compilerArgs << '-Xlint:unchecked'
    options.deprecation = true
  }

  spotless {
    java {
      licenseHeaderFile rootProject.file('spotless.license.java.txt')
      googleJavaFormat() // use a specific formatter for Java files
      target '**/*.java'
    }
    kotlin {
      // optionally takes a version
      ktlint().userData(['indent_size': '2'])
      target '**/*.kt'

      // also supports license headers
      licenseHeaderFile rootProject.file('spotless.license.java.txt')
    }
  }

  afterEvaluate {
    if (project.tasks.findByName('check') && project.pluginManager.hasPlugin('java')) {
      check.dependsOn('spotlessCheck')
      check.dependsOn('jacocoTestReport')

      tasks.withType(Test) {

        testLogging {
          events "passed", "skipped", "failed"
        }
        // ensure tasks don't overwrite the default report directories used by the 'test' task
        reports.html.setDestination(new File("${buildDir}/reports/${name}"))
        reports.junitXml.setDestination(new File("${buildDir}/reports/${name}/results"))
        binResultsDir = file("${buildDir}/reports/${name}/results/binary/${name}")
      }
    }
  }
}