Jacoco Merged Report for Multimodule Android with Kotlin DSL

coverage.sh

  #!/bin/bash
clear
./gradlew clean mergedJacocoReport
./gradlew jacocoFullReport
REPORT_PATH="file://$(pwd)/build/reports/jacoco/jacocoFullReport/html/index.html"
echo ${REPORT_PATH} | pbcopy
echo "Report available at:"
echo ${REPORT_PATH}
echo "Report file path copied to clipboard. You can paste it in your favorite browser. :)"

#
# Before use it, in the first time, you must guarantee some running permissions:
# chmod +x coverage.sh
# 
# After that, you just need to run:
# ./coverage.sh
# 
# It will generate coverage report and copy the html report path to your clipboard.

mergedJacocoReport.gradle.kts

// Put it at root/buildSrc/src/main/kotlin
@file:Suppress("UnstableApiUsage")

plugins {
    jacoco
}

tasks.withType<Test> {
    configure<JacocoTaskExtension> {
        isIncludeNoLocationClasses = true
    }
}

task<JacocoReport>("mergedJacocoReport") {
    dependsOn("testDebugUnitTest", "createDebugCoverageReport")

    reports {
        xml.isEnabled = false
        html.isEnabled = false
    }

    val fileFilter = mutableSetOf(
        "**/R.class",
        "**/R\$*.class",
        "**/BuildConfig.*",
        "**/Manifest*.*",
        "**/*Test*.*",
        "android/**/*.*",
        "**/*\$Lambda$*.*", // Jacoco can not handle several "$" in class name.
        "**/*\$inlined$*.*" // Kotlin specific, Jacoco can not handle several "$" in class name.
    )

    classDirectories.setFrom(
        fileTree(project.buildDir) {
            include(
                "**/classes/**/main/**",
                "**/intermediates/classes/debug/**",
                "**/intermediates/javac/debug/*/classes/**", // Android Gradle Plugin 3.2.x support.
                "**/tmp/kotlin-classes/debug/**"
            )

            exclude(fileFilter)
        }
    )

    sourceDirectories.setFrom(
        fileTree("${project.buildDir}") {
            include(
                "src/main/java/**",
                "src/main/kotlin/**",
                "src/debug/java/**",
                "src/debug/kotlin/**"
            )
        }
    )
  
    executionData.setFrom(
        fileTree(project.buildDir) {
            include(
                "outputs/code_coverage/**/*.ec",
                "jacoco/jacocoTestReportDebug.exec",
                "jacoco/testDebugUnitTest.exec",
                "jacoco/test.exec"
            )
        }
    )
}

root_build.gradle.kts

// root/build.gradle.kts
buildScript {
// [...]
  dependencies {
//  [...]
    classpath("com.palantir:jacoco-coverage:0.4.0")
  }
}

// [...]
plugins {
    id("com.palantir.jacoco-full-report") version "0.4.0"
}

// optional:
jacocoFull {
    excludeProject(":excluded_module1", ":excluded_module2")
}
// [...]

submodule_build.gradle.kts

// submodule/build.gradle.kts
plugins { 
// [...]
  id(mergedJacocoReport)
}

jacoco {
    toolVersion = "0.8.2"
}

android {
    defaultConfig {
//      [...]
        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
    }
  
    testOptions {
        execution = "ANDROIDX_TEST_ORCHESTRATOR"
        animationsDisabled = true
        unitTests.apply {
            isReturnDefaultValues = true
            isIncludeAndroidResources = true
        }
    }
}
// [...]

Did you also use SonarQube to view the coverage reports?