anchor.diff:  npm run e2e
   ----
   
  +[[sec:headless-integration-testing]]
   ===== Headless integration testing
   
   To run the integration tests in a Firefox browser in the background (headless) use the following command.
  
positive.code: .Chrome does not work for automatic browser testing
  ====
  This does not work with current versions of Chrome (as they might be installed on your local machine as well as with current Linux distributions as used by Docker).
  Therefor end-to-end testing is recommended based on the headless mode (see <<Headless integration testing>>).
  ====
  
  Use the following command to run them:
  
negative.code: 
  `mvn test`:: can be used to perform the the build and unit test.
  `mvn verify`:: can be used to perform the build and test including the end-to-end test with a real browser (see <<caution:chrome-does-not-work>>).
  `mvn verify -Pheadless`:: Used to run with Firefox instead of Chrome (cf. <<sec:headless-integration-testing>>)
  `mvn clean`:: may be used as usual to clean up the local build.
  `mvn clean -Pveryclean`:: also cleans up the NPM and Node installation.
  
  [[sec:testing-with-maven-docker]]
  ==== Testing with Maven (Docker)
  
  If you want to run the build as it is done on our CI-Server (Jenkins), please run `./docker-mvn.sh` with the deired Maven goals, e.g.,
  