Class and instance attributes in unittest.TestCase

test_dmr.py

from unittest import TestCase


class DMRTest(TestCase):
    class_count = 0

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.instance_count = 0

    def test_foo(self):
        self.class_count += 1
        self.instance_count += 1
        print(f"foo {self.class_count=} {self.instance_count=}")

    def test_bar(self):
        self.class_count += 2
        self.instance_count += 2
        print(f"bar {self.class_count=} {self.instance_count=}")

    def test_baz(self):
        self.class_count += 4
        self.instance_count += 4
        print(f"baz {self.class_count=} {self.instance_count=}")

       
"""
This yields:

/home/dmr/workspace/synapse/env/bin/python /home/dmr/.local/share/JetBrains/Toolbox/apps/PyCharm-C/ch-0/212.4746.96/plugins/python-ce/helpers/pycharm/_jb_trialtest_runner.py --target tests.util.test_dmr.DMRTest
Testing started at 12:08 ...
Launching trial with arguments --reporter=teamcity tests.util.test_dmr.DMRTest in /home/dmr/workspace/synapse


-------------------------------------------------------------------------------
Ran 3 tests in 0.008s

PASSED (successes=3)

Process finished with exit code 0
bar self.class_count=2 self.instance_count=2
baz self.class_count=4 self.instance_count=4
foo self.class_count=1 self.instance_count=1


"""