Jacoco report isn't excluding specified files

Question

I'm using Jacoco 0.8.5 and Gradle 6.4, I have an Android project which I'm trying to setup my code coverage. Here is how my jacoco.gradle file:

apply plugin: 'jacoco'

def flavor = "debug"
def unitTestTask = "testDebugUnitTest"

jacoco {
    toolVersion = "0.8.5"
}

tasks.withType(Test) {
    jacoco.includeNoLocationClasses = true
}

final androidExcludes =
        ["**/R.class",
         "**/R\$*.class",
         "**/BuildConfig.*",
         "**/Manifest*.*",
         "**/*Test*.*",
         "android/**/*.*",
         "**/*_MembersInjector.class",
         "**/Dagger*Component.class",
         "**/Dagger*Component\$Builder.class",
         "**/*Module_*Factory.class",
         "**/*_Provide*Factory*.*",
         "**/*_Factory*.*",
         "**/*Activity*.*",
         "**/*Fragment*.*",
         "**/*ViewHolder*.*",
         "**/*Adapter*.*"]


task jacocoReport(type: JacocoReport, dependsOn: "${unitTestTask}") {
    reports {
        xml.enabled = true
        html.enabled = true
    }

    afterEvaluate {

        def debugTree = fileTree(dir: "$project.buildDir/intermediates/javac/${flavor}/classes",
                excludes: androidExcludes)
        def kotlinDebugTree = fileTree(dir: "$project.buildDir/tmp/kotlin-classes/${flavor}/",
                excludes: androidExcludes)
        def mainSrc = "$project.projectDir/src/main/java"

        sourceDirectories.setFrom(files([mainSrc]))
        classDirectories.setFrom(files([debugTree], [kotlinDebugTree]))
        executionData.setFrom(fileTree(dir: project.buildDir, includes: ["jacoco/${unitTestTask}.exec"]))
    }
}

I want to remove from the coverage some files, set in androidExcludes, for example Activities or Adapter. But currently the report doesn't take into account my excludes, as you can see in the following report from CodeCov I still have excluded files (ViewHolder or Adapter)

Answer 1

JaCoCo probably won't generate coverage reports, while there are no tests in app/src/test (or app/src/androidTest for integration tests). For JUnit 5 it also needs these dependencies:

dependencies {

    // (Required) Writing and executing Unit Tests on the JUnit Platform
    testImplementation ("org.junit.jupiter:junit-jupiter-api:5.6.2")
    testRuntimeOnly ("org.junit.jupiter:junit-jupiter-engine:5.6.2")

    // (Optional) If you need "Parameterized Tests"
    testImplementation ("org.junit.jupiter:junit-jupiter-params:5.6.2")

    // (Optional) If you also have JUnit 4-based tests
    testImplementation ("junit:junit:4.13")
    testRuntimeOnly("org.junit.vintage:junit-vintage-engine:5.6.2")

    androidTestImplementation ("org.junit.jupiter:junit-jupiter-api:5.6.2")

    // The instrumentation test companion libraries
    androidTestImplementation ("de.mannodermaus.junit5:android-test-core:1.2.0")
    androidTestRuntimeOnly ("de.mannodermaus.junit5:android-test-runner:1.2.0")

    // testImplementation ("androidx.test:core:1.2.0")
    // androidTestImplementation("androidx.test:runner:1.2.0")
    androidTestImplementation("androidx.test:rules:1.2.0")
}

PR #23 fixes the tests. The output from :jacocoTestReportDebug looks alike this then:

Notice the Created with JaCoCo 0.8.5.201910111838 at the bottom.

---

And for CodeCov, you'd need to add a codecov.yml; see ignoring paths
(the CodeCov configuration does not care about the JaCoCo configuration).