On 01/08/2019 11:15, STINNER Victor wrote:
> FAILED (failures=1)
> Warning -- files was modified by test_threading
>   Before: []
>   After:  ['core']

Thanks. I'll look again (on my bot) and other test systems.

What I assume has not been clear about my question - from the output I
see that there is, somewhere, a file named 'core' - but I can never find
it - and my assumption is that the test environment is cleaning up after
itself.

So, rephrased - is there a way to stop running test cycle when there is
an environment error, especially with a core dump, so that it can be
examined for further clues.

Michael