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Minimal fix:...
Minimal fix: line_buffer is an old denomination, it can be multiline text. so update names in new functions. Fix types annotations.

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test_shimmodule.py
15 lines | 417 B | text/x-python | PythonLexer
import sys
import warnings
import nose.tools as nt
from IPython.utils.capture import capture_output
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)