Android - Jacoco code coverage ignores Robolectric tests

Question

Trying to get Code coverage on my Robolectric tests in Android utilising Jacoco but it simply refuses to acknowledge my Robolectric tests when creating the reports.

My jacoco.gradle file is as follows:

apply plugin: 'jacoco'

jacoco {
    toolVersion = "0.7.6.201602180812"
}

project.afterEvaluate {

    android.applicationVariants.all { variant ->
        def name = variant.name
        def testTaskName = "test${name.capitalize()}UnitTest"

        tasks.create(name: "${testTaskName}Coverage", type: JacocoReport, dependsOn: "$testTaskName") {
            group = "Reporting"
            description = "Generate Jacoco coverage reports for the ${name.capitalize()} build."

            classDirectories = fileTree(
                    dir: "${project.buildDir}/intermediates/classes/${name}",
                    excludes: ['**/R.class',
                               '**/R$*.class',
                               '**/*$ViewInjector*.*',
                               '**/*$ViewBinder*.*',
                               '**/BuildConfig.*',
                               '**/Manifest*.*']
            )

            sourceDirectories = files(['src/main/java'].plus(android.sourceSets[name].java.srcDirs))
            executionData = files("${project.buildDir}/jacoco/${testTaskName}.exec")

            reports {
                xml.enabled = true
                html.enabled = true
            }
        }
    }
}

With this setup I can get Coverage reports but I get 0% coverage despite having Robolectric tests in "src/test/java".

If I add in the following code to that file:

android {
    testOptions {
        unitTests.all {
            jacoco {
                includeNoLocationClasses = true
            }
        }
    }
}

I get the following error when Gradle tries to sync:

Error:No such property: includeNoLocationClasses for class: org.gradle.testing.jacoco.plugins.JacocoTaskExtension_Decorated

I know that I need to have Gradle 2.13 to use this includeNoLocationClasses value so in graddle-wrapper.properties I have the following:

#Wed Apr 10 15:27:10 PDT 2013
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions-snapshots/gradle-2.13-20160228000026+0000-all.zip

I am pretty certain I am running Gradle 2.13 with Android plugin version 1.5

In my apps Gradle file I have the following:

//...

apply from: 'jacoco.gradle'

//..

testOptions {
    unitTests.returnDefaultValues = true
}

//...

debug {
    testCoverageEnabled true
}

And the command I use to run the coverage is:

./gradlew createDebugCoverageReport

So I am wondering why I get the includeNoLocationClasses error despite using the correct Gradle version? And outside of that maybe I am doing something wrong where Jacoco isn't picking up the Robolectric tests in src/test.java ?

Answer 1

I don't see you build.gradle completely, but to have that flag in you have to:

1. Use gradle 2.13+
2. Use jacoco 0.7.6.201602180812

You're sure that you use gradle proper version. So, I think, the issue is only in using wrong jacoco.

Mentioning jacoco {toolVersion = "0.7.6.201602180812"} doesn't influence gradle DSL. You should add newer jacoco plugin:

buildscript {
    repositories {
        jcenter()
    }

    dependencies {
        classpath 'org.jacoco:org.jacoco.core:...'
    }
}

And you should apply plugin, which you're already doing:

apply from: 'jacoco'

After such configuraiton you don't need jacoco {toolVersion = "..."} more.

Note: consider to update to newer android gradle plugin, 2.2.x is already stable. jacoco also has newer version already 0.7.7.201606060606

One more note: if you see original issue in Android Studio, check that you use wrapper by default and check that you pointed wrapper to gradle 2.13