Gitlab CI script for Medium article: https://medium.com/evenbit/c66b93bf896a

.gitlab-ci.yml

.test_lab_template: &test_lab_template_def
  stage: test
  before_script:
    # Install Google Cloud SDK
    - wget --quiet --output-document=/tmp/google-cloud-sdk.tar.gz https://dl.google.com/dl/cloudsdk/channels/rapid/google-cloud-sdk.tar.gz
    - mkdir -p /opt
    - tar zxf /tmp/google-cloud-sdk.tar.gz --directory /opt
    - /opt/google-cloud-sdk/install.sh --quiet
    - source /opt/google-cloud-sdk/path.bash.inc

    # Setup and configure the project
    - gcloud components update
    - echo $CLOUD_PROJECT_ID
    - gcloud config set project $CLOUD_PROJECT_ID

    # Activate cloud credentials
    - echo $SERVICE_ACCOUNT > /tmp/service-account.json
    - gcloud auth activate-service-account --key-file /tmp/service-account.json

    # List available options for logging purpose only (so that we can review available options)
    - gcloud firebase test android models list
    - gcloud firebase test android versions list


  after_script:
    - source /opt/google-cloud-sdk/path.bash.inc

    # Iterate up to 10 possible test lab configurations and create CLI tool options
    - for i in `seq 1 10`; do export CONFIG="TEST_LAB_DEVICE_CONFIGURATION_$i"; if [ -n "${!CONFIG}" ]; then export TEST_LAB_DEVICE_CONFIGURATIONS="$TEST_LAB_DEVICE_CONFIGURATIONS --device model=${!CONFIG} "; fi; done
    
    # Output for debug logging purpose only
    - echo $TEST_LAB_DEVICE_CONFIGURATIONS
    
    # Run tests if there were any configured
    - if [ -n "$TEST_LAB_DEVICE_CONFIGURATIONS" ]; then gcloud firebase test android run --type robo --app app.apk $TEST_LAB_DEVICE_CONFIGURATIONS --timeout 90s; fi
    
    # Warn if there were no configurations
    - if [ -z "$TEST_LAB_DEVICE_CONFIGURATIONS" ]; then echo "NO FIREBASE TESTLAB CONFIGURATIONS!!!"; fi

test_lab_test_debug:
  <<: *test_lab_template_def
  only:
    - test-lab
  script:
    - cp app/build/outputs/apk/app-debug.apk ./app.apk

test_lab_test_release:
  <<: *test_lab_template_def
  only:
    - master
  script:
    - cp app/build/outputs/apk/app-release.apk ./app.apk