[PYTHON] Apply monkey patch to all methods of pytest test class

Failure

class TestHoge():
    def setup_class(cls, monkeypatch):
        monkeypatch.setattr(target, 'TargetObj', MockObj)

Returns the following error: TypeError: setup_class() missing 1 required positional argument: 'monkeypatch'

success

class TestHoge():
    @pytest.fixture(autouse=True)
    def patch(self, monkeypatch):
        monkeypatch.setattr(target, 'TargetCls', MockCls)

    def test_some_func(self):
        ret = target.TargetCls().some_func()

By defining fixture in the test class and setting autouse = True, monkey patch will be applied to all methods in the class.