'``StandardOut`` has a performer that writes content to sys.stdout.'

def test_perform(self):

    fake_sys_module = FakeSysModule()
    intent = StandardOut(content=random_name(self).encode('ascii'))
    result = sync_perform(dispatcher=RealPerformers(sys_module=fake_sys_module).dispatcher(), effect=Effect(intent=intent))
    self.assertIs(None, result)
    self.assertEqual(intent.content, fake_sys_module.stdout.getvalue())
