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Remove some of the cast_unicode as we can prove they are not bytes....
Remove some of the cast_unicode as we can prove they are not bytes. 1) inspect getdoc impementation return None if docs is not str. 2) if a value is split, joined, or concatenated with str, it must be str, or we woudl get a type error.

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test_shimmodule.py
13 lines | 344 B | text/x-python | PythonLexer
import sys
import warnings
from IPython.utils.shimmodule import ShimWarning
def test_shim_warning():
sys.modules.pop('IPython.config', None)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter("always")
import IPython.config
assert len(w) == 1
assert issubclass(w[-1].category, ShimWarning)