7d62575 causes a regression in testscenarios

[s-t-e-v-e-n-k]

While building testscenarios 0.5.0 with testing-cabal/testscenarios#17 merged, I'm getting the following test errors:

[    6s] + python3.11 -m testtools.run testscenarios.test_suite
[    6s] Tests running...
[    6s] .s.s.s.s.s.s.s.s.s.s..........EE....======================================================================
[    6s] ERROR: testscenarios.tests.test_scenarios.TestLoadTests.test_load_tests_apply_scenarios
[    6s] ----------------------------------------------------------------------
[    6s] Traceback (most recent call last):
[    6s]   File "/home/abuild/rpmbuild/BUILD/python-testscenarios-test-0.5.0-build/testscenarios-0.5.0/testscenarios/tests/test_scenarios.py", line 189, in test_load_tests_apply_scenarios
[    6s]     suite = load_tests_apply_scenarios(
[    6s]             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[    6s]   File "/home/abuild/rpmbuild/BUILD/python-testscenarios-test-0.5.0-build/testscenarios-0.5.0/testscenarios/scenarios.py", line 111, in load_tests_apply_scenarios
[    6s]     result.addTests(generate_scenarios(standard_tests))
[    6s]   File "/usr/lib64/python3.11/unittest/suite.py", line 58, in addTests
[    6s]     self.addTest(test)
[    6s]   File "/usr/lib64/python3.11/unittest/suite.py", line 47, in addTest
[    6s]     raise TypeError("{} is not callable".format(repr(test)))
[    6s] TypeError: [<testscenarios.tests.test_scenarios.TestLoadTests.SampleTest testMethod=test_nothing>] is not callable
[    6s] ======================================================================
[    6s] ERROR: testscenarios.tests.test_scenarios.TestLoadTests.test_load_tests_apply_scenarios_old_style
[    6s] ----------------------------------------------------------------------
[    6s] Traceback (most recent call last):
[    6s]   File "/home/abuild/rpmbuild/BUILD/python-testscenarios-test-0.5.0-build/testscenarios-0.5.0/testscenarios/tests/test_scenarios.py", line 201, in test_load_tests_apply_scenarios_old_style
[    6s]     suite = load_tests_apply_scenarios(
[    6s]             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[    6s]   File "/home/abuild/rpmbuild/BUILD/python-testscenarios-test-0.5.0-build/testscenarios-0.5.0/testscenarios/scenarios.py", line 111, in load_tests_apply_scenarios
[    6s]     result.addTests(generate_scenarios(standard_tests))
[    6s]   File "/usr/lib64/python3.11/unittest/suite.py", line 58, in addTests
[    6s]     self.addTest(test)
[    6s]   File "/usr/lib64/python3.11/unittest/suite.py", line 47, in addTest
[    6s]     raise TypeError("{} is not callable".format(repr(test)))
[    6s] TypeError: [<testscenarios.tests.test_scenarios.TestLoadTests.SampleTest testMethod=test_nothing>] is not callable

I've bisected it down to being introduced in 7d62575