pytest discovery crashes when calling clr.AddReference

Environment

Pythonnet version: 2.4.0
Python version: Python 3.6.0 |Continuum Analytics, Inc.| (default, Dec 23 2016, 11:57:41) [MSC v.1900 64 bit (AMD64)] on win32
Operating System: Windows 10 (1803)
pytest: 5.3.1

Details

Describe what you were trying to get done.

I'm trying to discover and run tests that include calls to clr.AddReference in their module level imports.

What commands did you run to trigger this issue? If you can provide a
Minimal, Complete, and Verifiable example
this will help us understand the issue.

Create a pytest test file that looks like this:

import clr

clr.AddReference(r"c:\some_net_dll.dll")

def test_just_a_dummy():
    assert 1 == 1

Replace the reference to a DLL above to a real .net DLL that loads fine when the above file is just run using regular python.exe.
Use VS Code test discovery, or just call pytest --collect-only

If there was a crash, please include the traceback here.

============================================================= test session starts =============================================================
platform win32 -- Python 3.6.0, pytest-5.3.1, py-1.8.0, pluggy-0.13.1
rootdir: C:\Users\me\source\repos\utils-tester
collecting ... Windows fatal exception: code 1073807366

Current thread 0x0000468c (most recent call first):
  File "c:\Users\me\source\repos\utils-tester\tests\plypost_test.py", line 3 in <module>
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\assertion\rewrite.py", line 143 in exec_module
  File "<frozen importlib._bootstrap>", line 655 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 950 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 961 in _find_and_load
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\py\_path\local.py", line 701 in pyimport
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\python.py", line 492 in _importtestmodule
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\python.py", line 424 in _getobj
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\python.py", line 248 in obj
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\python.py", line 440 in _inject_setup_module_fixture
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\python.py", line 427 in collect
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\runner.py", line 254 in <lambda>
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\runner.py", line 234 in from_call
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\runner.py", line 254 in pytest_make_collect_report
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\manager.py", line 87 in <lambda>
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\runner.py", line 373 in collect_one_node
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\main.py", line 717 in genitems
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\main.py", line 720 in genitems
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\main.py", line 492 in _perform_collect
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\main.py", line 454 in perform_collect
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\main.py", line 255 in pytest_collection
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\manager.py", line 87 in <lambda>
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\main.py", line 245 in _main
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\main.py", line 196 in wrap_session
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\main.py", line 239 in pytest_cmdline_main
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\callers.py", line 187 in _multicall
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\manager.py", line 87 in <lambda>
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\manager.py", line 93 in _hookexec
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\pluggy\hooks.py", line 286 in __call__
  File "c:\users\me\source\repos\utils-tester\.venv\lib\site-packages\_pytest\config\__init__.py", line 92 in main
  File "C:\Users\me\source\repos\utils-tester\.venv\Scripts\pytest.exe\__main__.py", line 9 in <module>
  File "C:\ProgramData\Anaconda3\Lib\runpy.py", line 85 in _run_code
  File "C:\ProgramData\Anaconda3\Lib\runpy.py", line 193 in _run_module_as_main
Windows fatal exception: code 1073807366