Re: adding a simulation mode
 

One way instead that might actually work is this

def default_mock_action(func_name):
def _default_mock_action(*args, **kwargs):
print("running {} with args {} and {}".format(func_name, args, kwargs))

return _default_mock_action


def mock_fs_actions(to_run):
"""Take a function to run, and run it in an environment which
mocks all the possibly dangerous operations
"""
side_effect = [
'copytree',
'copy',
]

acts = dict((s, default_mock_action(s)) for s in side_effect)

with patch('pytest.runner.commands.ShellCommand.run',
default_mock_action('run')):
with patch.multiple('shutil', **acts):
to_run()


So I can just pass the main function inside the mock like
mock_fs_actions(main)

and it seems to do the job, but I have to list manually all the things
to mock and I'm not sure is the best idea anyway..