title: Tests against an api which uses LocalDateTime
body: <p>I have to write some tests against an api which uses internally <code>LocalDateTime.now()</code>, does some stuff with this value and returns a pretty long String (~1MB).</p>
  
  <p>I want to write some regression tests to make sure results are the same even if a new release of the api comes out.</p>
  
  <p>Sadly the test results differ every time because <code>LocalDateTime.now()</code> always returns different values (surprise, surprise...)</p>
  
  <p>Is it possible somehow to fix the result of <code>LocalDateTime.now()</code> to a hard coded value.</p>
  
  <p>Since it only has to work in some unit tests dirty solutions are also welcome.</p>