STINNER Victor added the comment:
https://github.com/python/cpython/pull/3055 removes the functional test and
replaces it with an unit test which mocks os.waitpid() using a new
_testcapi.W_STOPCODE() function to test the WIFSTOPPED() path.
The functional test created a core dump, but it's now fixed using
SuppressCrashReport. It leaks a zombie process in a special state, the process
is traced and cannot be killed. I tried to wait for the process a second time,
but it's not enough to "close" it. I guess that we would have to write a little
debugger to attach the process in the parent process. IMHO it's overcomplicated
just to check that subprocess calls WIFSTOPPED().
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