In my last article pytest Tutorial Part 1 I showed some basic concepts.
Here are two additional concepts
Test parameterization follows the concept of DRY – Don’t repeat yourself
Instead of writing a new testcase for every different value you annotate your test function and handover the different values. The test will be executed as often as there are values:
import pytest @pytest.mark.parametrize( "data, expected_mean", [ (, 1), ([1, 2], 1.5) ] ) def test_calculate_mean(data, expected_mean): pass
With markers you can control test case execution:
import pytest @pytest.mark.windows def test_win_ver(): pass @pytest.mark.linux def test_lin_ver(): pass @pytest.mark.mac_os def test_stuff_mac_os(): pass
# content of pytest.ini [pytest] markers = windows: tests code under win linux: tests code under lin mac_os: tests code under mac os