Utkarsh Upadhyay added the comment:
So the problem is occurring because a single `Test` class is being instantiated
with three different tests here in datetimetester.py:
for name in ZoneInfo.zonenames():
Test = type('ZoneInfoTest[%s]' % name, (ZoneInfoTest,), {})
Test.zonename = name
for method in dir(Test):
if method.startswith('test_'):
tests.append(Test(method))
here:
https://github.com/python/cpython/blob/master/Lib/test/datetimetester.py#L4853
The `Test` class which is being dynamically created is being instantiated with
the test methods: test_folds, test_gaps, test_system_transitions and is being
appended to tests. This makes that class to appear thrice in `test_classes` in
`test_datetime.py`:
elif issubclass(cls, unittest.TestSuite):
suit = cls()
test_classes.extend(type(test) for test in suit)
here:
https://github.com/python/cpython/blob/master/Lib/test/test_datetime.py#L34
Hence, the class gets `_Pure` and `_Fast` appended to its name thrice and gets
executed thrice, making the tests take 3 times as long to run.
This is confirmed by changing the code to the following:
for name in ZoneInfo.zonenames():
Test = type('ZoneInfoTest[%s]' % name, (ZoneInfoTest,), {})
Test.zonename = name
tests.append(Test())
# for method in dir(Test):
# if method.startswith('test_'):
# tests.append(Test(method))
However, I'm not sure what implications this has w.r.t. unittests and the
advanced cases.
The other way to fix it is to create a set out of the classes, as suggested in
PR #2534.
~
ut
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