def test_create():
server = Server(host=None)
setup_server(server)
conn = Connection('newconn', None)
server._process_create(conn, 'newuser')
assert len(server.users) == 4
assert server.users[-1].username == 'newuser'
def test_create_failure():
server = Server(host=None)
setup_server(server)
conn = Connection('newconn', None)
server._process_create(conn, 'u2')
assert len(server.users) == 3
assert conn.send_buffer[-len('username already exists'
):] == b'username already exists'
