Pytest setup/teardown不执行

import pytest
class Test_MainPage(object):
    def setup(self):
        connect_phone()
        check_start_app()
        print("\n------->setup method")

    def teardown(self):
        print("\n------->teardown method")
if __name__ == '__main__':
    pytest.main(["-s","Test_MainPage.py"])

求解决，没有执行setup和teardown的内容

Test_MainPage这个类没有实例化调用啊