message: Run tests only on Linux
  (as self-installed Chrome does not work on MacOS)
diff: @@ -24,7 +24,7 @@ addons:
  - dpkg
  - google-chrome-stable
  install: if [[ -z "$TRAVIS_TAG" ]]; then npm install; fi
  -script: if [[ -z "$TRAVIS_TAG" && "$TRAVIS_OS_NAME" != "windows" ]]; then NODE_ENV=test npm test; fi
  +script: if [[ -z "$TRAVIS_TAG" && "$TRAVIS_OS_NAME" == "linux" ]]; then NODE_ENV=test npm test; fi
  before_deploy:
  - rm -rf node_modules
  - rm -rf frontend/node_modules
  