gh-71339: Improve error report for types in assertHasAttr() and assertNotHasAttr() (GH-128818)

Author: serhiy-storchaka

Lib/test/test_unittest/test_case.py

@@ -795,7 +795,15 @@ def testAssertHasAttr(self):
         with self.assertRaises(self.failureException) as cm:
             self.assertHasAttr(a, 'y')
         self.assertEqual(str(cm.exception),
-                "List instance has no attribute 'y'")
+                "'List' object has no attribute 'y'")
+        with self.assertRaises(self.failureException) as cm:
+            self.assertHasAttr(List, 'spam')
+        self.assertEqual(str(cm.exception),
+                "type object 'List' has no attribute 'spam'")
+        with self.assertRaises(self.failureException) as cm:
+            self.assertHasAttr(sys, 'spam')
+        self.assertEqual(str(cm.exception),
+                "module 'sys' has no attribute 'spam'")
 
         with self.assertRaises(self.failureException) as cm:
             self.assertHasAttr(a, 'y', 'ababahalamaha')
@@ -811,7 +819,15 @@ def testAssertNotHasAttr(self):
         with self.assertRaises(self.failureException) as cm:
             self.assertNotHasAttr(a, 'x')
         self.assertEqual(str(cm.exception),
-                "List instance has unexpected attribute 'x'")
+                "'List' object has unexpected attribute 'x'")
+        with self.assertRaises(self.failureException) as cm:
+            self.assertNotHasAttr(List, 'append')
+        self.assertEqual(str(cm.exception),
+                "type object 'List' has unexpected attribute 'append'")
+        with self.assertRaises(self.failureException) as cm:
+            self.assertNotHasAttr(sys, 'modules')
+        self.assertEqual(str(cm.exception),
+                "module 'sys' has unexpected attribute 'modules'")
 
         with self.assertRaises(self.failureException) as cm:
             self.assertNotHasAttr(a, 'x', 'ababahalamaha')

Lib/unittest/case.py

@@ -1372,16 +1372,20 @@ def assertHasAttr(self, obj, name, msg=None):
         if not hasattr(obj, name):
             if isinstance(obj, types.ModuleType):
                 standardMsg = f'module {obj.__name__!r} has no attribute {name!r}'
+            elif isinstance(obj, type):
+                standardMsg = f'type object {obj.__name__!r} has no attribute {name!r}'
             else:
-                standardMsg = f'{type(obj).__name__} instance has no attribute {name!r}'
+                standardMsg = f'{type(obj).__name__!r} object has no attribute {name!r}'
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertNotHasAttr(self, obj, name, msg=None):
         if hasattr(obj, name):
             if isinstance(obj, types.ModuleType):
                 standardMsg = f'module {obj.__name__!r} has unexpected attribute {name!r}'
+            elif isinstance(obj, type):
+                standardMsg = f'type object {obj.__name__!r} has unexpected attribute {name!r}'
             else:
-                standardMsg = f'{type(obj).__name__} instance has unexpected attribute {name!r}'
+                standardMsg = f'{type(obj).__name__!r} object has unexpected attribute {name!r}'
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertRaisesRegex(self, expected_exception, expected_regex,