How run all the tests in a pytest test test class when the test class don't have test methods directly?

class TestNode:

    class TestSetParent:
        def test_1(self):
            assert True

        def test_2(self):
            assert True

    class TestGetParent:
        def test_1(self):
            assert True

        def test_2(self):
            assert True

In this case, there is no way to recognize that the entire file is a pytest file, and there is no way to recognize that the outermost class is actually executable.

Of course if you edit the configuration file manually, it is able to run either the whole file directly or that class.

1. Is this a BUG?

2. How do I all tests in the configuration file without manually editing the configuration file?

Of course, adding an irrelevant test method to that test class would solve this problem, which is not very good because it adds redundant and useless code.