Why pytest deselect all the tests when run with python -m test?

Question

I can run the tests by executing (on Windows)

pytest .\tests\test_x.py

Result:

================================= test session starts ==================================

platform win32 -- Python 3.8.3, pytest-5.4.3, py-1.9.0, pluggy-0.13.1

rootdir: C:\Users\......

collected 9 items

tests\test_x.py .........                                                         [100%]

================================== 9 passed in 3.67s ===================================

These are the following two commands

pytest -m tests

pytest -m test

This is the result i got. My question is why all my tests are deselected while they can be run as a script?

PS C:\Users\......> pytest -m test

================================= test session starts ==================================

platform win32 -- Python 3.8.3, pytest-5.4.3, py-1.9.0, pluggy-0.13.1

rootdir: C:\Users\......

collected 9 items / 9 deselected

================================ 9 deselected in 3.78s =================================

Answer 1

You're using the -m which filters which tests to run according to how you mark your tests. You're telling a pytest to only run tests tagged @pytest.mark.test.

Presumably, you don't have any tests marked as such.

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Answer 2

You can want to run all tests, simply use pytest or pytest.\tests\test_x.py without -m option.

 If you intend to run tests that are marked, you have to write your test functions with right marker

import pytest

@pytest.mark.test
def test_case():
    assert True

After adding the marker, running pytest -m test will include those tests

You can also check all the exiting markers in your tests by running pytest –markers

Answer 3

You can want to run all tests, simply use pytest or pytest.\tests\test_x.py without -m option.

If you intend to run tests that are marked, you have to write your test functions with right marker

import pytest

@pytest.mark.test
def test_case():
assert True

After adding the marker, running pytest -m test will include those tests

You can also check all the exiting markers in your tests by running pytest –markers