`from hermes_cli import gateway_windows` resolves the package attribute before sys.modules, so after another test imported the real module the fake was bypassed and the union run failed with "gateway_windows is Windows-only".
`from hermes_cli import gateway_windows` resolves the package attribute before sys.modules, so after another test imported the real module the fake was bypassed and the union run failed with "gateway_windows is Windows-only".