MinimalBible/app-test/build.gradle

apply plugin: 'java'
apply plugin: 'kotlin'
apply plugin: 'jacoco'

def androidModule = project(':app')
def firstVariant = androidModule.android.applicationVariants.toList().first()

dependencies {
    compile androidModule

    testCompile firstVariant.javaCompile.classpath
    testCompile firstVariant.javaCompile.outputs.files
    testCompile files(androidModule.plugins.findPlugin("com.android.application").getBootClasspath())

    testCompile 'junit:junit:4.+'
    testCompile 'org.robolectric:robolectric:+'
}


jacocoTestReport {
    /*
    Alright, setting up Jacoco the right way is massively confusing.
    Normally, you'd use something like additionalClassDirs to add the folders you need.
    However, we want to exclude the android/ folder, and likely will need something else
    in the future. In order to do this though, we need the doFirst block. See SO here:
        http://stackoverflow.com/a/17411305/1454178

    Additionally, to properly exclude, we need to run that code outside the doFirst block.
    No clue why this is, but please don't change this without extensive testing.
    */
    def jacocoExcludes = [
            "android/**/*"
    ]
    firstVariant.javaCompile.exclude(jacocoExcludes).outputs.files

    doFirst {
        sourceDirectories = files(androidModule.android.sourceSets.main.java.srcDirs)
        classDirectories = firstVariant.javaCompile.outputs.files
    }

    // Back to your regularly scheduled Jacoco
    dependsOn test

    reports {
        xml.enabled true
        csv.enabled false
        html.destination "${buildDir}/jacocoHtml"
    }
}