Call Python 3.8 doClassCleanups (#8033)

AUTHORS

@@ -232,6 +232,7 @@ Pauli Virtanen
 Pavel Karateev
 Paweł Adamczak
 Pedro Algarvio
+Petter Strandmark
 Philipp Loose
 Pieter Mulder
 Piotr Banaszkiewicz

changelog/8032.improvement.rst

@@ -0,0 +1 @@
+`doClassCleanups` (introduced in `unittest` in Python and 3.8) is now called.

src/_pytest/unittest.py

@@ -99,26 +99,48 @@ class UnitTestCase(Class):
         """Injects a hidden auto-use fixture to invoke setUpClass/setup_method and corresponding
         teardown functions (#517)."""
         class_fixture = _make_xunit_fixture(
-            cls, "setUpClass", "tearDownClass", scope="class", pass_self=False
+            cls,
+            "setUpClass",
+            "tearDownClass",
+            "doClassCleanups",
+            scope="class",
+            pass_self=False,
         )
         if class_fixture:
             cls.__pytest_class_setup = class_fixture  # type: ignore[attr-defined]
 
         method_fixture = _make_xunit_fixture(
-            cls, "setup_method", "teardown_method", scope="function", pass_self=True
+            cls,
+            "setup_method",
+            "teardown_method",
+            None,
+            scope="function",
+            pass_self=True,
         )
         if method_fixture:
             cls.__pytest_method_setup = method_fixture  # type: ignore[attr-defined]
 
 
 def _make_xunit_fixture(
-    obj: type, setup_name: str, teardown_name: str, scope: "_Scope", pass_self: bool
+    obj: type,
+    setup_name: str,
+    teardown_name: str,
+    cleanup_name: Optional[str],
+    scope: "_Scope",
+    pass_self: bool,
 ):
     setup = getattr(obj, setup_name, None)
     teardown = getattr(obj, teardown_name, None)
     if setup is None and teardown is None:
         return None
 
+    if cleanup_name:
+        cleanup = getattr(obj, cleanup_name, lambda *args: None)
+    else:
+
+        def cleanup(*args):
+            pass
+
     @pytest.fixture(
         scope=scope,
         autouse=True,
@@ -130,16 +152,32 @@ def _make_xunit_fixture(
             reason = self.__unittest_skip_why__
             pytest.skip(reason)
         if setup is not None:
-            if pass_self:
-                setup(self, request.function)
-            else:
-                setup()
+            try:
+                if pass_self:
+                    setup(self, request.function)
+                else:
+                    setup()
+            # unittest does not call the cleanup function for every BaseException, so we
+            # follow this here.
+            except Exception:
+                if pass_self:
+                    cleanup(self)
+                else:
+                    cleanup()
+
+                raise
         yield
-        if teardown is not None:
+        try:
+            if teardown is not None:
+                if pass_self:
+                    teardown(self, request.function)
+                else:
+                    teardown()
+        finally:
             if pass_self:
-                teardown(self, request.function)
+                cleanup(self)
             else:
-                teardown()
+                cleanup()
 
     return fixture
 

testing/test_unittest.py

@@ -1260,3 +1260,163 @@ def test_plain_unittest_does_not_support_async(testdir):
             "*1 passed*",
         ]
     result.stdout.fnmatch_lines(expected_lines)
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 8), reason="Feature introduced in Python 3.8"
+)
+def test_do_class_cleanups_on_success(testdir):
+    testpath = testdir.makepyfile(
+        """
+        import unittest
+        class MyTestCase(unittest.TestCase):
+            values = []
+            @classmethod
+            def setUpClass(cls):
+                def cleanup():
+                    cls.values.append(1)
+                cls.addClassCleanup(cleanup)
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        def test_cleanup_called_exactly_once():
+            assert MyTestCase.values == [1]
+    """
+    )
+    reprec = testdir.inline_run(testpath)
+    passed, skipped, failed = reprec.countoutcomes()
+    assert failed == 0
+    assert passed == 3
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 8), reason="Feature introduced in Python 3.8"
+)
+def test_do_class_cleanups_on_setupclass_failure(testdir):
+    testpath = testdir.makepyfile(
+        """
+        import unittest
+        class MyTestCase(unittest.TestCase):
+            values = []
+            @classmethod
+            def setUpClass(cls):
+                def cleanup():
+                    cls.values.append(1)
+                cls.addClassCleanup(cleanup)
+                assert False
+            def test_one(self):
+                pass
+        def test_cleanup_called_exactly_once():
+            assert MyTestCase.values == [1]
+    """
+    )
+    reprec = testdir.inline_run(testpath)
+    passed, skipped, failed = reprec.countoutcomes()
+    assert failed == 1
+    assert passed == 1
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 8), reason="Feature introduced in Python 3.8"
+)
+def test_do_class_cleanups_on_teardownclass_failure(testdir):
+    testpath = testdir.makepyfile(
+        """
+        import unittest
+        class MyTestCase(unittest.TestCase):
+            values = []
+            @classmethod
+            def setUpClass(cls):
+                def cleanup():
+                    cls.values.append(1)
+                cls.addClassCleanup(cleanup)
+            @classmethod
+            def tearDownClass(cls):
+                assert False
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        def test_cleanup_called_exactly_once():
+            assert MyTestCase.values == [1]
+    """
+    )
+    reprec = testdir.inline_run(testpath)
+    passed, skipped, failed = reprec.countoutcomes()
+    assert passed == 3
+
+
+def test_do_cleanups_on_success(testdir):
+    testpath = testdir.makepyfile(
+        """
+        import unittest
+        class MyTestCase(unittest.TestCase):
+            values = []
+            def setUp(self):
+                def cleanup():
+                    self.values.append(1)
+                self.addCleanup(cleanup)
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        def test_cleanup_called_the_right_number_of_times():
+            assert MyTestCase.values == [1, 1]
+    """
+    )
+    reprec = testdir.inline_run(testpath)
+    passed, skipped, failed = reprec.countoutcomes()
+    assert failed == 0
+    assert passed == 3
+
+
+def test_do_cleanups_on_setup_failure(testdir):
+    testpath = testdir.makepyfile(
+        """
+        import unittest
+        class MyTestCase(unittest.TestCase):
+            values = []
+            def setUp(self):
+                def cleanup():
+                    self.values.append(1)
+                self.addCleanup(cleanup)
+                assert False
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        def test_cleanup_called_the_right_number_of_times():
+            assert MyTestCase.values == [1, 1]
+    """
+    )
+    reprec = testdir.inline_run(testpath)
+    passed, skipped, failed = reprec.countoutcomes()
+    assert failed == 2
+    assert passed == 1
+
+
+def test_do_cleanups_on_teardown_failure(testdir):
+    testpath = testdir.makepyfile(
+        """
+        import unittest
+        class MyTestCase(unittest.TestCase):
+            values = []
+            def setUp(self):
+                def cleanup():
+                    self.values.append(1)
+                self.addCleanup(cleanup)
+            def tearDown(self):
+                assert False
+            def test_one(self):
+                pass
+            def test_two(self):
+                pass
+        def test_cleanup_called_the_right_number_of_times():
+            assert MyTestCase.values == [1, 1]
+    """
+    )
+    reprec = testdir.inline_run(testpath)
+    passed, skipped, failed = reprec.countoutcomes()
+    assert failed == 2
+    assert passed == 1