init

Output:

    % pytest -svv
    ============== test session starts ===============
    platform linux -- Python 3.7.4, pytest-5.0.2.dev72+g4abf95ba4, py-1.7.0, pluggy-0.12.0 -- /home/daniel/Vcs/pytest-django/.venv/bin/python
    cachedir: .pytest_cache
    Django settings: pytest_django_test.settings_sqlite_file (from ini file)
    rootdir: /home/daniel/Vcs/pytest-django, inifile: setup.cfg
    plugins: forked-0.2, cov-2.6.1, django-3.5.1.dev1+ng33aa666
    collected 3 items

    test_test.py::Test::test_1st <- t-unittest/mod1/__init__.py test_1st <test_test.Test object at 0x7f377a157990>
    PASSED
    test_test.py::Test::test_2nd <- t-unittest/mod2/__init__.py test_2nd <test_test.Test object at 0x7f377a067910>
    PASSED
    test_test.py::Test::test_test test_test <test_test.Test object at 0x7f377a0f11d0>
    PASSED

    ============ 3 passed in 0.05 seconds ============

Author: blueyed

README.md

@@ -0,0 +1 @@
+Debug pytest / pytest-django unittest issue (https://github.com/pytest-dev/pytest-django/issues/753)

mixin.py

@@ -0,0 +1,3 @@
+class MyMixin:
+    def setUpClass(cls):
+        print('MyMixin.setUpClass', cls)

mod1/__init__.py

@@ -0,0 +1,6 @@
+from mixin import MyMixin
+
+
+class FirstTestCase(MyMixin):
+    def test_1st(self):
+        print("test_1st", self)

mod2/__init__.py

@@ -0,0 +1,6 @@
+from mod1 import FirstTestCase
+
+
+class SecondTestCase(FirstTestCase):
+    def test_2nd(self):
+        print("test_2nd", self)

test_test.py

@@ -0,0 +1,6 @@
+from mod2 import SecondTestCase
+
+
+class Test(SecondTestCase):
+    def test_test(self):
+        print("test_test", self)