Single test not found when running pytest with "::" notation

[aleGpereira]

By having the following project structure in a folder called parametized_bug:

.
├── Pipfile
├── Pipfile.lock
├── app.py
└── test
    └── test_app.py

where app.py:

def hello_world(arg1):
    """
    docstring
    """
    return f"Hello world {arg1}!"

and test_app.py:

from unittest import TestCase
from app import hello_world
from parameterized import parameterized

class TestApp(TestCase):

    @parameterized.expand(
        [('Mars'),('Jupiter')]
    )
    def test_hello_world(self, arg1):
        result = hello_world(arg1)
        self.assertEqual(result, f'Hello world {arg1}!')

If I run the following

python -m pytest test/test_app.py::TestApp                  
================================================================================================== test session starts ===================================================================================================
platform darwin -- Python 3.8.6, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
rootdir: /Users/user/parametized_bug
collected 2 items                                                                                                                                                                                                        

test/test_app.py ..                                                                                                                                                                                                [100%]

=================================================================================================== 2 passed in 0.04s ====================================================================================================

But if I run it as this other way, it fails:

python -m pytest test/test_app.py::TestApp::test_hello_world
================================================================================================== test session starts ===================================================================================================
platform darwin -- Python 3.8.6, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
rootdir: /Users/user/parametized_bug
collected 0 items                                                                                                                                                                                                        

================================================================================================= no tests ran in 0.03s ==================================================================================================
ERROR: not found: /Users/user/parametized_bug/test/test_app.py::TestApp::test_hello_world
(no name '/Users/user/parametized_bug/test/test_app.py::TestApp::test_hello_world' in any of [<Module test/test_app.py>])

If I change test_app.py to:

from unittest import TestCase
from app import hello_world

class TestApp(TestCase):

    def test_hello_world(self):
        arg1 = "Mars"
        result = hello_world(arg1)
        self.assertEqual(result, f'Hello world {arg1}!')

When I run it again, it works:

python -m pytest test/test_app.py::TestApp::test_hello_world
================================================================================================== test session starts ===================================================================================================
platform darwin -- Python 3.8.6, pytest-6.2.4, py-1.10.0, pluggy-0.13.1
rootdir: /Users/user/parametized_bug
collected 1 item                                                                                                                                                                                                         

test/test_app.py .                                                                                                                                                                                                 [100%]

=================================================================================================== 1 passed in 0.04s ====================================================================================================

[rohitnwork]

+1