title: Executing JUnit 4 and JUnit 5 tests in a same build
body: <p>In Maven projects, I have some existing tests relying on JUnit 4. I cannot migrate these tests in JUnit 5 for multiple reasons.<br>
  Essentially, some tests depend on a library which uses JUnit 4 runner and code migration may take time.<br></p>
  
  <p>I would like all the same create new test classes with JUnit 5 that is now released and provides new interesting features.<br>
  How to do that ?</p>