title: Error "setTestClassesDir(File) method has been deprecated" when trying to export signed package for Android app
body: <p>I am a beginner to programming and I just finished a simple game for Android made using Processing. However, when I try to get the app's APK (to export signed package) I get the following errors:</p>
  
  <p>The keystore could not be created, due to the following error:</p>
  
  <p>Build folder: C:\Users\User\AppData\Local\Temp\android5125294986448583924sketch
  The setTestClassesDir(File) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use the setTestClassesDirs(FileCollection) method instead.
  The getTestClassesDir() method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use the getTestClassesDirs() method instead.
  The ConfigurableReport.setDestination(Object) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use the method ConfigurableReport.setDestination(File) instead.</p>
  
  <p>As I am a beginner I have absolutely no clue how to proceed.</p>
  
  <p>It would really suck to see all the effort that I put into creating the app to go to waste....</p>
  
  <p>Any help is greatly appreciated!</p>