Gradle, Kotlin, Junit5 and Jacoco - 0% coverage reported - gradle

Question

We would like to use Gradle in conjunction with Kotlin and Jacoco (+JUnit 5) for generating a code coverage report.
Our project directory tree looks as follows:
project/{src,test}/main/kotlin ...
Our build.gradle file looks as follows:
jacoco {
toolVersion = "0.7.9"
reportsDir = file("$buildDir/reports")
applyTo junitPlatformTest
}
jacocoTestReport {
group = "Reporting"
description = "Generate Jacoco coverage report."
classDirectories = fileTree(
dir: "$buildDir/classes/kotlin/main"
)
def coverageSourceDirs = [
"src/main/kotlin"
]
additionalSourceDirs = files(coverageSourceDirs)
sourceDirectories = files(coverageSourceDirs)
executionData = files("$buildDir/jacoco/junitPlatformTest.exec")
reports {
xml.enabled = true
html.enabled = true
csv.enabled = true
}
}
test {
jacoco {
append = false
destinationFile = file("$buildDir/jacoco/junitPlatformTest.exec")
includeNoLocationClasses = true
}
}
test.dependsOn junitPlatformTest
With this configuration, Jacoco generates a html report and puts it under build/reports/test/html. However, it shows me 0% coverage. This should not be the case, because I have one test case that excercices all methods for a single dummy class in the project.
I went through several posts such as:
http://vgaidarji.me/blog/2017/12/20/how-to-configure-jacoco-for-kotlin-and-java-project/
Jacoco is reporting 0 coverage of Kotlin classes by unit tests, in an Android project
JaCoCo returning 0% Coverage with Kotlin and Android 3.0
However, I could not quite find a solution that worked for me, yet.

Answer 1

I recently hit this issue when upgrading form junit 4 -> 5. In my case I had to re-arrange the declaration of the dependencies as outlined here. If you change to this format you should see the coverage reported correctly again without having to change any other configuration.
dependencies {
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine'
}