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We need to returned match text only if matches have been found....
We need to returned match text only if matches have been found. If we don't do so, it will not try the next completers.

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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)