Bitrise configuration + Jacoco for Junit + Instrumentation tests + Vitual Device Testing

bitrise.yml

---
format_version: 1.4.0
default_step_lib_source: https://github.com/bitrise-io/bitrise-steplib.git

workflows:
  ci:
    steps:
      - activate-ssh-key@4.0.3:
          run_if: '{{getenv "SSH_RSA_PRIVATE_KEY" | ne ""}}'
      - git-clone@4.0.14: {}
      - cache-pull@2.0.1: {}
      - script@1.1.5:
          title: Do anything with Script step
      - install-missing-android-tools@2.3.5:
          inputs:
            - gradlew_path: "$PROJECT_LOCATION/gradlew"
      - android-detekt@0.0.2:
          inputs:
            - module: "$MODULE"
      - android-lint@0.9.6:
          inputs:
            - project_location: "$PROJECT_LOCATION"
            - module: "$MODULE"
            - variant: "$VARIANT"
      - gradle-runner:
          inputs:
            - gradle_task: assembleDebug assembleDebugAndroidTest
            - gradle_file: "build.gradle"
      - virtual-device-testing-for-android@1.1.1:
          inputs:
            - environment_variables: |-
                coverage=true
                coverageFile=/sdcard/coverage.ec
            - directories_to_pull: "/sdcard/"
            - download_test_results: 'true'
            - use_verbose_log: 'true'
            - test_type: instrumentation
      - android-unit-test@0.11.1:
          inputs:
            - project_location: "$PROJECT_LOCATION"
            - module: "$MODULE"
            - arguments: jacocoTestReport
            - variant: "$VARIANT"
      - codecov@1.1.6:
          run_if: true
          is_skippable: false
          inputs:
            - CODECOV_TOKEN: "$CODECOV_TOKEN"
      - deploy-to-bitrise-io@1.6.0: {}
      - cache-push@2.2.0:
          inputs:
            - cache_paths: |-
                $BITRISE_CACHE_DIR
                $HOME/.gradle
                ./.gradle
            - ignore_check_on_paths: |-
                $HOME/.gradle/caches/*.lock
                $HOME/.gradle/caches/*.bin
                ./.gradle/*.lock
                ./.gradle/*.bin
  ci_deploy:
    steps:
      - activate-ssh-key@4.0.3:
          run_if: '{{getenv "SSH_RSA_PRIVATE_KEY" | ne ""}}'
      - git-clone@4.0.14: {}
      - change-android-versioncode-and-versionname@1.1.1:
          inputs:
            - new_version_name: "$BITRISE_GIT_TAG"
            - build_gradle_path: "$PROJECT_LOCATION/$MODULE/build.gradle"
      - cache-pull@2.0.1: {}
      - install-missing-android-tools@2.3.5:
          inputs:
            - gradlew_path: "$PROJECT_LOCATION/gradlew"
      - android-build@0.9.5:
          inputs:
            - project_location: "$PROJECT_LOCATION"
            - module: "$MODULE"
            - variant: "$VARIANT"
      - script@1.1.5:
          title: Do anything with Script step
          inputs:
            - content: |-
                #!/usr/bin/env bash

                wget https://github.com/github/hub/releases/download/v2.7.1/hub-linux-amd64-2.7.1.tgz
                tar zvxvf hub-linux-amd64-2.7.1.tgz
                sudo ./hub-linux-amd64-2.7.1/install

                # Setup autocomplete for bash:
                mkdir -p ~/.bash/completions
                mv ./hub-linux-amd64-2.7.1/etc/hub.bash_completion.sh ~/.bash/completions/_hub
                echo "if [ -f ~/.bash/completions/_hub ]; then" >> ~/.bashrc
                echo "    . ~/.bash/completions/_hub" >> ~/.bashrc
                echo "fi" >> ~/.bashrc

                # add alias
                echo "eval "$(hub alias -s)"" >> ~/.bashrc

                # Cleanup
                rm -rf hub-linux-amd64-2.7.1

                hub version

                set -e

                # Authorize hub
                mkdir -p ~/.config/

                cat << EOF > ~/.config/hub
                github.com:
                - user: "$GITHUB_USERNAME"
                  oauth_token: "$GITHUB_TOKEN_ACESS"
                  protocol: https
                EOF

                set +e

                cd $PROJECT_LOCATION
                pwd
                # errors if release doesn't exist
                hub release delete $BITRISE_GIT_TAG

                exit 0
      - git-commit-changelog@1.0.5: {}
      - github-release@0.10.0:
          inputs:
            - body: |-
                Release $BITRISE_GIT_TAG

                Changes
                $COMMIT_CHANGELOG
            - draft: 'no'
            - api_token: "$GITHUB_TOKEN_ACESS"
            - username: "$GITHUB_USERNAME"
            - files_to_upload: "$BITRISE_APK_PATH"
            - name: "$BITRISE_GIT_TAG"
      - deploy-to-bitrise-io@1.6.0: {}
      - cache-push:
          inputs:
            - cache_paths: |-
                $BITRISE_CACHE_DIR
                $HOME/.gradle
                ./.gradle
            - ignore_check_on_paths: |-
                $HOME/.gradle/caches/*.lock
                $HOME/.gradle/caches/*.bin
                ./.gradle/*.lock
                ./.gradle/*.bin
app:
  envs:
    - opts:
        is_expand: false
      PROJECT_LOCATION: "."
    - opts:
        is_expand: false
      MODULE: app
    - opts:
        is_expand: false
      VARIANT: debug
    - GRADLEW_PATH: "./gradlew"

jacoco.gradle

apply plugin: 'jacoco'

jacoco {
    toolVersion = '0.8.5'
}

def fileFilter = ['**/R.class',
                  '**/R$*x.class',
                  '**/BuildConfig.*',
                  '**/Manifest*.*',
                  '**/*Test*.*',
                  '**/*$*',
                  'android/**/*.*',
                  '**/*Function*',
                  '**/*_impl*',
                  '**/*.DefaultImpls.*']

task jacocoTestReport(type: JacocoReport, overwrite: true) {

    def kotlinSrc = "$project.projectDir/src/main/kotlin"
    def javaSrc = "$project.projectDir/src/main/java"
    def javaClasses = fileTree(dir: "$project.buildDir/intermediates/javac/debug", excludes: fileFilter)
    def kotlinClasses = fileTree(dir: "$project.buildDir/tmp/kotlin-classes/debug", excludes: fileFilter)

    def dependencyTasks
    if (project.plugins.hasPlugin('com.android.application') ||
            project.plugins.hasPlugin("com.android.library")) {
        dependencyTasks = ['testDebugUnitTest']
    } else {
        kotlinClasses = fileTree(dir: "$project.buildDir/classes/kotlin/main", excludes: fileFilter)
        dependencyTasks = ['test']
    }

    dependsOn {
        dependencyTasks
    }

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

    getSourceDirectories().setFrom([javaSrc, kotlinSrc])
    getClassDirectories().setFrom([javaClasses, kotlinClasses])
    getExecutionData().setFrom([fileTree(dir: project.buildDir, includes: [
            'jacoco/testDebugUnitTest.exec', 'outputs/code_coverage/debugAndroidTest/connected/*.ec'
    ])], [fileTree(dir: "${System.env.VDTESTING_DOWNLOADED_FILES_DIR}", includes: [
            '*sdcard_coverage.ec'
    ])])

}

Hi, the output reports from jacoco can be found on your app build dir once the jacocoTestReport is executed. Remember that this must be done after the execution of the instrumentation tests on an apk with coverage enabled to generate the *.ec files. In the configuration above theses files are automatically dowloaded to the Linux instance after the virtual device testing step(in that case, firebase test lab) and saved on VDTESTING_DOWNLOADED_FILES_DIR