Running ipytest.main multiple times triggers rewrite warnings for plugins #5432
Description
When running ipytest.main multiple times inside the same python process, the rewrite warning ("Module already imported so cannot be rewritten:" ...) is trigged for plugins. A minimal example is:
pip install pytest pytest_asyncioimport pytest
pytest.main()
pytest.main()My real use case is: I'm using ipytest (I'm also the author) to run tests inside jupyter notebooks with pytest. Internally, ipytest calls pytest.main. Hence, the rewrite warnings are triggered. The pytest_asyncio plugin is just an example, previously I observed the same behavior with the nbval plugin.
I'm running pytest==4.2.6on OSX 10.13.6. The packages are:
Package Version Location
------------------ -------- ----------------------------------------
aiohttp 3.5.4
appnope 0.1.0
async-timeout 3.0.1
atomicwrites 1.3.0
attrs 19.1.0
backcall 0.1.0
bleach 3.1.0
certifi 2019.3.9
chardet 3.0.4
commonmark 0.9.0
decorator 4.4.0
defusedxml 0.6.0
entrypoints 0.3
future 0.17.1
idna 2.8
importlib-metadata 0.17
ipykernel 5.1.1
ipytest 0.6.0
ipython 7.5.0
ipython-genutils 0.2.0
ipywidgets 7.4.2
jedi 0.13.3
Jinja2 2.10.1
jsonschema 3.0.1
jupyter 1.0.0
jupyter-client 5.2.4
jupyter-console 6.0.0
jupyter-core 4.4.0
keyring 19.0.2
MarkupSafe 1.1.1
mistletoe 0.7.2
mistune 0.8.4
more-itertools 7.0.0
multidict 4.5.2
nbconvert 5.5.0
nbformat 4.4.0
notebook 5.7.8
packaging 19.0
pandocfilters 1.4.2
parso 0.4.0
pexpect 4.7.0
pickleshare 0.7.5
pip 19.1.1
pluggy 0.12.0
prometheus-client 0.7.0
prompt-toolkit 2.0.9
ptyprocess 0.6.0
py 1.8.0
Pygments 2.4.2
pyparsing 2.4.0
pyrsistent 0.15.2
pytest 4.6.2
pytest-asyncio 0.10.0
python-dateutil 2.8.0
pyzmq 18.0.1
qtconsole 4.5.1
requests 2.22.0
Send2Trash 1.5.0
setuptools 41.0.1
six 1.12.0
terminado 0.8.2
testpath 0.4.2
tornado 6.0.2
traitlets 4.3.2
urllib3 1.25.3
wcwidth 0.1.7
webencodings 0.5.1
wheel 0.33.4
widgetsnbextension 3.4.2
yarl 1.3.0
zipp 0.5.1
Checklist:
- a detailed description of the bug or suggestion
- output of
pip listfrom the virtual environment you are using - pytest and operating system versions
- minimal example if possible