spyder-unittest crashes and locks even on restart

[boardtc]

Description of your problem

spyder-unittest crashes and locks even on restart

What steps will reproduce the problem?

1. New project
2. directories src & tests_ each containing init.py
3. src contains myclass.py with class MyClass1
4. tests contains test_myclass,py with from src.myclass import MyClass1
5. Select Run | Run Unit tests and pick tests directory
6. Crashes
7. When reopen Spyder spyder-unittest window shows running tests and does not respond to stop

If I try and run the unit test from the CL directly ,python -m unittest test_myclass, I get ModuleNotFoundError: No module named 'src' but it's found with python -m unittest discover

Key versions and other information:

• Spyder version: 4.1.5
• Version of spyder-unittest plugin: 0.4.1
• Installation method for Spyder and the unittest plugin: Anaconda
• Python version: 3.8.5
• Testing framework used: unittest
• Testing framework version:
• Operating system: windows 10