Travis.yml

osx_image: xcode8.3
xcode_workspace: HelloOpenSource.xcworkspace
matrix:
  include:
    - os: linux
      dist: trusty
      sudo: required
      language: generic

    - xcode_scheme: HelloOpenSource macOS
      language: objective-c
      env:
        - XCODE_SDK=macosx10.12
        - XCODE_ACTION="test"
        - XCODE_DESTINATION="arch=x86_64"

    - xcode_scheme: HelloOpenSource iOS
      language: objective-c
      env:
        - XCODE_SDK=iphonesimulator10.3
        - XCODE_ACTION="test"
        - XCODE_DESTINATION="platform=iOS Simulator,OS=10.3,name=iPhone 6"

    - xcode_scheme: HelloOpenSource tvOS
      language: objective-c
      env:
        - XCODE_SDK=appletvsimulator10.2
        - XCODE_ACTION="test"
        - XCODE_DESTINATION="platform=tvOS Simulator,OS=10.2,name=Apple TV 1080p"

    - xcode_scheme: HelloOpenSource watchOS
      language: objective-c
      env:
        - XCODE_SDK=watchsimulator3.2
        - XCODE_ACTION="build" 
        - XCODE_DESTINATION="platform=watchOS Simulator,name=Apple Watch - 38mm"
install:   
  - if [[ `uname` == "Linux" ]] ; then 
        eval "$(curl -sL https://gist.githubusercontent.com/kylef/5c0475ff02b7c7671d2a/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh)";
    fi
script:    
    - if [[ `uname` == "Linux" ]] ; then
        swift test;
      fi

    - if [[ `uname` == "Darwin" ]] ; then
        set -o pipefail;
        xcodebuild -version;
        xcodebuild -showsdks;
        instruments -s devices;
        travis_retry xcodebuild -workspace "$TRAVIS_XCODE_WORKSPACE" -scheme "$TRAVIS_XCODE_SCHEME" -sdk "$XCODE_SDK" -destination "$XCODE_DESTINATION" -configuration Debug ENABLE_TESTABILITY=YES $XCODE_ACTION | xcpretty;
      fi
after_success:
    - sleep 5 # workaround https://github.com/travis-ci/travis-ci/issues/4725