Commit 68e6782c authored by Manuel Stoeckl's avatar Manuel Stoeckl

Use subprocess.Popen for startup failure test

According to the Python documentation, the new usage should be valid
for Python >=3.3, covering a wider range than the >=3.5 for
subprocess.Popen. Also, this change avoids a possible regression
with Python 3.8.0 in which the TimeoutExpired exception no longer
provides a non-None .output field.
parent 9f0b9f2e
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