unittest: Add setUp/tearDown methods to TestCase.

By ensuring that the `setUp`/`tearDown` methods exist in `TestCase`,
we simplify the logic needed when subclassing tests. Previously people
would need to know if their super class had a `setUp` method before
attempting to call it from their overwritten version.

Signed-off-by: Greg Darke <micropython@me.tsukasa.au>

Author: tsukasa-au

python-stdlib/unittest/unittest/__init__.py

@@ -71,6 +71,20 @@ class TestCase:
     def __init__(self):
         pass
 
+    def setUp(self):
+        pass
+
+    @classmethod
+    def setUpClass(cls):
+        pass
+
+    def tearDown(self):
+        pass
+
+    @classmethod
+    def tearDownClass(cls):
+        pass
+
     def addCleanup(self, func, *args, **kwargs):
         if not hasattr(self, "_cleanups"):
             self._cleanups = []