viv/tests/test_use.py

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import sys
import pytest
from viv import use
def test_use():
with pytest.raises(ImportError):
import pyjokes # noqa
use("pyjokes")
import pyjokes # noqa
with pytest.raises(ImportError):
from sample.simple import add_one # noqa
assert len([p for p in sys.path if "site-packages" in p]) == 1