gh-121982: `csv: Add a test case for invalid quoting` constant. (#121983)

Test invalid quoting constant

Co-authored-by: Kirill Podoprigora <kirill.bast9@mail.ru>

Lib/test/test_csv.py

@@ -1103,6 +1103,12 @@ class TestDialectValidity(unittest.TestCase):
         mydialect.quoting = None
         self.assertRaises(csv.Error, mydialect)
 
+        mydialect.quoting = 42
+        with self.assertRaises(csv.Error) as cm:
+            mydialect()
+        self.assertEqual(str(cm.exception),
+                         'bad "quoting" value')
+
         mydialect.doublequote = True
         mydialect.quoting = csv.QUOTE_ALL
         mydialect.quotechar = '"'