anchor.diff:  npm run e2e_headless
   ----
   
  +[[sec:testing-with-maven-direct]]
   ==== Testing with Maven (direct)
   
   The Maven build is based on the Maven Frontend Plugin.
  
positive.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. <<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.
  
  ==== 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.,
  
negative.code: 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.
  