Pycharm Unittests Only Work Individually

I can run my test cases individually by right-clicking them and selecting Run 'Unittests in test_whatever' but when I right-click the project root folder and select Run 'Unittests

Solution 1:

Did you set the checkboxes Add content roots to PYTHONPATH and Add source roots to PYTHONPATH in the Run/Debug Configuration Dialog of pyCharm. If not, this could help.