test/jdk/java/io/File/TempDirDoesNotExist.java creates temp files in
  System.getProperty("user.home")
using:
  File.createTempFile("prefix", ".suffix");

There is no finally block in the test to delete the TempFile later.

After a few weeks of running tests this leaves test systems with many prefix*.suffix files littering the user home directory.

This test also appears to be one which would benefit from conversion to JUnit 5.