human
Here's a good function header given the following:
I wrote the below code

    @roles('r1', 'r2')
    @hosts('d')
    def command():
        pass
    eq_hosts(command, ['a', 'b', 'c', 'd'], env={'roledefs': fake_roles})
    eq_effective_roles(command, ['r1', 'r2'], env={'roledefs': fake_roles})

What's a good function header?
assistant
#Here's a good function header.

def test_hosts_and_roles_together():