When updating the source code for a .sctunit file while running that same file a dialog pops up asking to terminate or relaunch.
When choosing terminate it seems not to terminate (at least not within a minute). When manually terminating using stop button in progress dock it gives an error:
Launching '<filename>.sctunit' has encountered a problem. An internal error occurred during: "Launching <filename>.sctunit
Details:
An internal error occurred during: "Launching tests.sctunit".
java.lang.NullPointerException
But that does terminate.
Just clicking the stop button works fine and terminates without any problems.