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

Test invalid quoting constant

(cherry picked from commit 656b7a3)

Co-authored-by: Tomas R <[email protected]>
Co-authored-by: Kirill Podoprigora <[email protected]>

Author: 2 people

Lib/test/test_csv.py

@@ -1071,6 +1071,12 @@ class mydialect(csv.Dialect):
         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 = '"'