.gitlab-ci.yml

cache:
  key:
  
stages:
  - build
  - test
  - deploy

after_script:
  - (if [ "$(lsof -n -i4TCP:2137)" != "" ]; then kill -9 $(lsof -n -i4TCP:2137); else echo "Cleaned"; exit 33; fi);


detox_test:iOS:
    stage: test
    before_script:
      - brew tap wix/brew
      - brew install --HEAD applesimutils
      - npm install -g detox-cli
      - npm install -g react-native-cli
      - npm install
    script:
        - react-native start --port 2137 &
        - detox build -c ios.sim.debug 
        - detox test -c ios.sim.debug
        - kill -9 $(lsof -n -i4TCP:2137) 
    tags:
        - xcode-9.2

detox_test:android:
  stage: test
  services:
  -   name: android-emulator:latest
      alias: pixel
      entrypoint: ["/start-emulator.sh", "android-23", "x86", "pixel"]
  before_script:
    - adb connect pixel:5555; sh ./scripts/waitForDevice.sh pixel 
    - mkdir -p ./detox_node/
    - npm install --prefix ./detox_node/ -g detox-cli
    - npm install --prefix ./detox_node/ -g react-native-cli
    - npm install
  script:
    - ./detox_node/bin/react-native start --port 2137 &
    - ./detox_node/bin/detox build -c android.emu.debug
    - ./detox_node/bin/detox test -c android.emu.debug
    - kill -9 $(lsof -n -i4TCP:2137) 
  tags:
    - android-emu
  

Hi admin,
pls provide repo for that