fix(card): mastercard() no longer accepts non-Mastercard 2-series BINs

The Mastercard 2-series range is 2221-2720, but the prefix pattern
matched 22-27 (i.e. 2200-2799). Numbers in 2200-2220 and 2721-2799 were
wrongly accepted as Mastercard, including Mir cards (2200-2204): the same
number passed both mir() and mastercard().

Use the precise 2-series sub-ranges. The Mir test cards are now included
in the mastercard negative fixtures, which they failed before this change.

Author: Jordan-Bourillot

src/validators/card.py

@@ -80,7 +80,7 @@ def mastercard(value: str, /):
         (Literal[True]): If `value` is a valid Mastercard card number.
         (ValidationError): If `value` is an invalid Mastercard card number.
     """
-    pattern = re.compile(r"^(51|52|53|54|55|22|23|24|25|26|27)")
+    pattern = re.compile(r"^(5[1-5]|222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)")
     return card_number(value) and len(value) == 16 and pattern.match(value)
 
 

tests/test_card.py

@@ -80,7 +80,13 @@ def test_returns_true_on_valid_mastercard(value: str):
 
 @pytest.mark.parametrize(
     "value",
-    visa_cards + amex_cards + unionpay_cards + diners_cards + jcb_cards + discover_cards,
+    visa_cards
+    + amex_cards
+    + unionpay_cards
+    + diners_cards
+    + jcb_cards
+    + discover_cards
+    + mir_cards,
 )
 def test_returns_failed_on_valid_mastercard(value: str):
     """Test returns failed on valid mastercard."""