How to keep Unit tests and Integrations tests separate in pytest

Yes, you can mark tests with the pytest.mark decorator.

Example:

def unit_test_1():
    # assert here

def unit_test_2():
    # assert here

@pytest.mark.integtest
def integration_test():
    # assert here

Now, from the command line, you can run pytest -m "not integtest" for only the unit tests, pytest -m integtest for only the integration test and plain pytest for all.

(You can also decorate your unit tests with pytest.mark.unit if you want, but I find that slightly tedious/verbose)

See the documentation for more information.