Ni!

 From `guix shell -CN conda` on a Guix System with Guix "cf9904b":

[...snipped...]

building /gnu/store/1fjkvsgwys8wj8s63dwc7ig92w5rkadj-conda-22.9.0.drv...
/ 'check' phasebuilder for `/gnu/store/1fjkvsgwys8wj8s63dwc7ig92w5rkadj-conda-22.9.0.drv' failed with exit code 1
build of /gnu/store/1fjkvsgwys8wj8s63dwc7ig92w5rkadj-conda-22.9.0.drv failed
View build log at '/var/log/guix/drvs/1f/jkvsgwys8wj8s63dwc7ig92w5rkadj-conda-22.9.0.drv.gz'.
guix shell: error: build of `/gnu/store/1fjkvsgwys8wj8s63dwc7ig92w5rkadj-conda-22.9.0.drv' failed

In the guix logs I see:

==================================== ERRORS ====================================
______________________ ERROR collecting tests/test_cli.py ______________________
ImportError while importing test module '/tmp/guix-build-conda-22.9.0.drv-0/source/tests/test_cli.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/gnu/store/9kmpn99l328qx5q5gyn6hs9dk5hm3mmg-python-pytest-7.1.3/lib/python3.10/site-packages/_pytest/python.py:608: in _importtestmodule
     mod = import_path(self.path, mode=importmode, root=self.config.rootpath)
/gnu/store/9kmpn99l328qx5q5gyn6hs9dk5hm3mmg-python-pytest-7.1.3/lib/python3.10/site-packages/_pytest/pathlib.py:533: in import_path
     importlib.import_module(module_name)
/gnu/store/dy3xh053ahkhrp2jamggq8cpsyvp8mg0-python-3.10.7/lib/python3.10/importlib/__init__.py:126: in import_module
     return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1050: in _gcd_import
     ???
<frozen importlib._bootstrap>:1027: in _find_and_load
     ???
<frozen importlib._bootstrap>:1006: in _find_and_load_unlocked
     ???
<frozen importlib._bootstrap>:688: in _load_unlocked
     ???
/gnu/store/9kmpn99l328qx5q5gyn6hs9dk5hm3mmg-python-pytest-7.1.3/lib/python3.10/site-packages/_pytest/assertion/rewrite.py:168: in exec_module
     exec(co, module.__dict__)
tests/test_cli.py:10: in <module>
     from mock import patch
E   ModuleNotFoundError: No module named 'mock'


[...snipped...]

=========================== short test summary info ============================
ERROR tests/test_cli.py
!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!

Best,

.~´