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[2.2.x] Fixed #27086 -- Doc'd fix for test suite hang on macOS. 

Backport of 5d9cf79baf from master
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Kees Hink 2019-10-09 12:08:31 +02:00 committed by Carlton Gibson
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docs/internals/contributing/writing-code/unit-tests.txt
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@ -331,6 +331,20 @@ Ensure you have the latest point release of a :ref:`supported Python version
<faq-python-version-support>`, since there are often bugs in earlier versions <faq-python-version-support>`, since there are often bugs in earlier versions
that may cause the test suite to fail or hang. that may cause the test suite to fail or hang.
On **macOS** (High Sierra and newer versions), you might see this message
logged, after which the tests hang::
objc[42074]: +[__NSPlaceholderDate initialize] may have been in progress in
another thread when fork() was called.
To avoid this set a ``OBJC_DISABLE_INITIALIZE_FORK_SAFETY`` environment
variable, for example::
$ OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES ./runtests.py
Or add ``export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES`` to your shell's
startup file (e.g. ``~/.profile``).
Many test failures with ``UnicodeEncodeError`` Many test failures with ``UnicodeEncodeError``
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