Pytest collection when folder and subfolder/file specified

[sashko1988]

I'm getting unexpected collection behavior.
Folder layout

tests/unit
├── test_one.py
├── test_two.py
└── test_three.py

pytest --collect-only tests/unit/ tests/unit/test_one.py collects only tests from tests/unit/test_one.py
While I would expect it to collect tests from all test files.

How can I force pytest to collect all tests from tests/unit/ ?

[The-Compiler]

See #12083

[sashko1988]

Thanx.