Fixed #36923 -- Added tests for non-hierarchical URI schemes in URLField.to_python().

Follow up to 951ffb3.

Author: nessita

tests/forms_tests/field_tests/test_urlfield.py

@@ -209,6 +209,20 @@ def test_urlfield_assume_scheme_when_colons(self):
             with self.subTest(value=value):
                 self.assertEqual(f.clean(value), expected)
 
+    def test_urlfield_non_hierarchical_schemes_unchanged_in_to_python(self):
+        f = URLField()
+        tests = [
+            "mailto:test@example.com",
+            "mailto:test@example.com?subject=Hello",
+            "tel:+1-800-555-0100",
+            "tel:555-0100",
+            "urn:isbn:0-486-27557-4",
+            "urn:ietf:rfc:2648",
+        ]
+        for value in tests:
+            with self.subTest(value=value):
+                self.assertEqual(f.to_python(value), value)
+
     def test_custom_validator_longer_max_length(self):
 
         class CustomLongURLValidator(URLValidator):