JaCoCo reporting 0% code coverage

Question

I am trying to setup test coverage with jacoco but I've been unsuccessful so far.

In my build.gradle I have added:

apply plugin: 'jacoco'

(...)

buildTypes {
    debug {
        testCoverageEnabled true
    }

(...)

task jacocoTestReport(type: JacocoReport, dependsOn: "test<MyFlavor>DebugUnitTest") {
    group = "Reporting"
    description = "Generate Jacoco coverage reports"

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

    def fileFilter = []
    def debugTree = fileTree(dir: "${buildDir}/intermediates/classes/debug", excludes: fileFilter)
    def mainSrc = "${project.projectDir}/src/main/java"

    sourceDirectories = files([mainSrc])
    classDirectories = files([debugTree])
    executionData = fileTree(dir: project.projectDir, includes:
            ['**/*.exec' , '**/*.ec'])
}

Then I run the JaCoCo test report with the following code:

./gradlew clean create<MyFlavor>DebugCoverageReport jacocoTestReport

I see that the unit tests are run successfully, but when I open the test report, located in:

<project>/build/reports/jacoco/jacocoTestReport/html/index.html

the report seems to be empty, as coverage is reported as N/A and not even the project packages are displayed.

Moreover, if I try to open the coverage file at

<project>/build/jacoco/test<MyFlavor>DebugUnitTest.exec

using Android Studio, all classes report 0.0% coverage.

I am using gradle 3.0.1

What am I doing wrong? Does this have something to do with the usage of flavors?

Please show the gradle build output (limited to Jacoco details). — C-Otto
– C-Otto, Commented Jan 23, 2018 at 15:30

Christopher · Accepted Answer · 2018-01-23 16:17:57Z

1

I was also struggling with UnitTests and JaCoCo. I solved my problem by using a different plugin.

In your root build.gradle add:

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.vanniktech:gradle-android-junit-jacoco-plugin:0.10.0'
    }
}

and apply the plugin in your module build.gradle:

apply plugin: 'com.vanniktech.android.junit.jacoco'

After a sync you should have new gradle tasks:

jacocoTestReport<<BuildVariant>>

edited Jan 23, 2018 at 16:17

answered Jan 23, 2018 at 15:54

Christopher

10.3k7 gold badges54 silver badges80 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

pandre Over a year ago

Thanks for the reply. I tried that plugin, but it seems like it is not compatible with gradle 3.0.1 :(

Christopher Over a year ago

Hmm, I don't think so. We have the same gradle android plugin version... But we used version 0.10.0 of this plugin in our code.

Sabya Over a year ago

Perfect!. This solution actually worked like a charm :)

pandre · Accepted Answer · 2018-01-23 18:52:24Z

1

We managed to find a solution to this problem.

It seems that, as we use gradle flavors, we had to add the flavor in the classDirectories line.

Here is our current task, with that change:

task jacocoTestReport(type: JacocoReport, dependsOn: "test<MyFlavor>DebugUnitTest") {
    group = "Reporting"
    description = "Generate Jacoco coverage reports"

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

    def fileFilter = []
    def debugTree = fileTree(dir: "${buildDir}/intermediates/classes/<MyFlavor>/", excludes: fileFilter)
    def mainSrc = "${project.projectDir}/src/main/java"

    sourceDirectories = files([mainSrc])
    classDirectories = files([debugTree])
    executionData = fileTree(dir: project.projectDir, includes:
            ['**/*.exec' , '**/*.ec'])
}

answered Jan 23, 2018 at 18:52

pandre

6,7257 gold badges44 silver badges50 bronze badges

1 Comment

Srishti Roy Over a year ago

from where one is having this file path "test<MyFlavor>DebugUnitTest")..how can i setup this in my gradle folder

Collectives™ on Stack Overflow

JaCoCo reporting 0% code coverage

2 Answers 2

3 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related