title: Errors such as: 'Solving environment: failed with initial frozen solve. Retrying with flexible solve' & 'unittest' tab
body: <p>I am working with spyder - python. I want to test my codes. I have followed the <code>pip install spyder-unittest</code> and <code>pip install pytest</code>. I have restarted the kernel and restarted my MAC as well. Yet, Unit Testing tab does not appear. Even when I drop down Run cannot find the Run Unit test. Does someone know how to do this? </p>