Android Jacoco Coverage Empty With Gradle

I'm trying to make jacoco create a code coverage report for my android test project. I have the following in build.gradle: apply plugin: 'com.android.application' apply plugin: 'ja

Solution 1:

Try to generate the debug coverage report using Nexus device (5 or 5x), it will works perfectly. I was facing same issue with Samsung devices (coverage.ec is empty) but after that I run it with Nexus 5x and everything was working fine.

Solution 2:

There's a problem in the Android Gradle Plugin 0.14.0 that generates an empty coverage.ec file. It's known and was fixed in a branch but doesn't seem to have made it out to the public yet: https://code.google.com/p/android/issues/detail?id=78556

On the other hand, a lovely workaround template project for Android Studio can be found here using Jacoco and RoboElectric: https://github.com/nenick/android-gradle-template

So you can wait for Google to fix it or use someone else's build library repository, but Android Studio 1.0.0's gradle plugin is useless.

Solution 3:

Jacoco should be inside of the android closure and the jacoco plugin declaration is not necessary:

apply plugin: 'com.android.application'
...
android {
    buildTypes {
        release {
        }
        debug {
            testCoverageEnabled true
        }
    }
    jacoco {
        toolVersion = "0.7.1.201405082137"
    }
}

Solution 4:

I use same gradle.build and just enter the command below to terminal. It gave me coverage report and test result as a html page.

$./gradlew createDebugCoverageReport

Another suggestion is ; enter terminal

$./gradlew --gui

it opens a gui window and you can find the correct command.

Solution 5:

I found a solution to same problem from Jacoco code coverage in Android Studio with flavors. It has example what to do in case coverage.ec is generated instead of testDebug.exec.

1. I created the jacocoTestReport task.

2. I executed $./gradlew createDebugCoverageReport which generates the coverage.ec file

3. After that I executed $./gradlew jacocoTestReport and that creates the HTML.