Do not call TestCase.tearDown for skipped TestCase

Fix pytest-dev#10060

src/_pytest/unittest.py

@@ -410,5 +410,11 @@ def check_testcase_implements_trial_reporter(done: List[int] = []) -> None:
 
 
 def _is_skipped(obj) -> bool:
-    """Return True if the given object has been marked with @unittest.skip."""
-    return bool(getattr(obj, "__unittest_skip__", False))
+    """Return True if the given object has been marked with @unittest.skip.
+
+    Also return True if obj is a method of a skipped object.
+    """
+    skipped = bool(getattr(obj, "__unittest_skip__", False))
+    if isinstance(obj, types.MethodType):
+        skipped |= _is_skipped(obj.__self__)
+    return skipped

testing/test_unittest.py

@@ -1265,12 +1265,24 @@ def tearDown(self):
             def test_1(self):
                 pass
 
+        {mark}("skipped for other reasons")
+        class MyTestCase2(unittest.TestCase):
+
+            def setUp(self):
+                pytest.test_pdb_teardown_skipped.append("setUp:" + self.id())
+
+            def tearDown(self):
+                pytest.test_pdb_teardown_skipped.append("tearDown:" + self.id())
+
+            def test_2(self):
+                pass
+
     """.format(
             mark=mark
         )
     )
     result = pytester.runpytest_inprocess("--pdb")
-    result.stdout.fnmatch_lines("* 1 skipped in *")
+    result.stdout.fnmatch_lines("* 2 skipped in *")
     assert tracked == []