In Pharo 5, it was possible to do...

TestCase subclass: #Example

....etc

Example >> test1

[ Transcript

crShow: Processor activeProcess priority printString;

tab;

show: Processor activeProcess name.

self halt.

Transcript

crShow: Processor activeProcess effectiveProcess priority printString;

tab;

show: Processor activeProcess effectiveProcess name��

] forkAt: 39 named: 'TEST'.

...and when this was run, a debugger would show for the forked code��

and stepping through it would produce the following output...

39 TEST

39 TEST

In Pharo 71047, no debugger shows up,��

and you only get one...

39 TEST

I guess this because more cleanup of tests is being done,

but it makes it harder to debug multi-threaded tests when��

debugger can't replicate the way the code normally runs.