title: Properly set (system) properties in JUnit 5
body: <p>We are using an approach similar to <a href="http://stefanbirkner.github.io/system-rules/" rel="noreferrer">System Rules</a> to handle (system) properties in our JUnit 4 tests. The main reason for this is to clean up the environment after each test, so that other tests do not inadvertently depend on possible side effects.</p>
  
  <p>Since JUnit 5 is released, I wonder if there is a "JUnit 5 way" of doing this?</p>