Negation filter deselects all tests if it contains a part of the path of rootdir

pip list

atomicwrites (1.3.0) attrs (19.1.0) importlib-metadata (0.23) more-itertools (7.2.0) packaging (19.2) pip (9.0.1) pkg-resources (0.0.0) pluggy (0.13.0) py (1.8.0) pyparsing (2.4.2) pytest (5.2.0) setuptools (39.0.1) six (1.12.0) wcwidth (0.1.7) zipp (0.6.0)

pytest and operating system versions

pytest-5.2.0 ubuntu 18.04 x64

Reproducer

$ pwd
/tmp/another_dir
$ cat test_pytest_bug.py
def test_pytest():
    assert True

$ cd /tmp/some_dir
$ pytest -v -o testpaths="/tmp/another_dir" -k "not some_dir" 
==========================test session starts===============================
platform linux -- Python 3.6.8, pytest-5.2.0, py-1.8.0, pluggy-0.13.0 -- /tmp/test/bin/python3
cachedir: .pytest_cache
rootdir: /tmp/some_dir, testpaths: /tmp/another_dir
collected 1 item / 1 deselected    

$ cd /tmp/another_dir
$ pytest -v -o testpaths="/tmp/another_dir" -k "not some_dir"
==========================test session starts===============================
platform linux -- Python 3.6.8, pytest-5.2.0, py-1.8.0, pluggy-0.13.0 -- /tmp/test/bin/python3
cachedir: .pytest_cache
rootdir: /tmp/another_dir, testpaths: .
collected 1 item                                                                                                                                                                                                 

test_pytest_bug.py::test_pytest PASSED

[RonnyPfannschmidt]

a non-root cause fix adding a pytest option/configuration to disable considering the session rootdir as a keyword can be applied more easily

[RonnyPfannschmidt]

@erheron as per the linked code fragments prior, Session is a FSCollector with the fspath attribute set to self.rootdir

that element is also taken in as keword via that path

so the workaround would be to have session drop its keyword for its path, which is rootdir