Create a single-process mode for debugging.

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pdb can not step through out-of-process code, nor can it hook onto the parent process's stdin/stdout. This means that if you use pdb inside a plugin, the pdb.set_trace() breaks and crashes that process.

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The test runner is in a single process. The way to debug using pdb (or any debugger) should be done through tests.

python main.py test

Will run all tests (pdb will get triggered and enter at the right time)

python -m tests/test_plugin/test_foo 

Will run the tests for the foo plugin. Note no 'main.py' and not 'test_foo.py'