Add bank provider for cs_CZ (#1968)

faker/providers/bank/cs_CZ/__init__.py

@@ -0,0 +1,11 @@
+from .. import Provider as BankProvider
+
+
+class Provider(BankProvider):
+    """Implement bank provider for ``cs_CZ`` locale.
+
+    https://www.mbank.cz/informace-k-produktum/info/ucty/cislo-uctu-iban.html
+    """
+
+    bban_format = "####################"
+    country_code = "CZ"

tests/providers/test_bank.py

@@ -4,6 +4,7 @@
 
 from faker.providers.bank import Provider as BankProvider
 from faker.providers.bank.az_AZ import Provider as AzAzBankProvider
+from faker.providers.bank.cs_CZ import Provider as CsCZBankProvider
 from faker.providers.bank.de_CH import Provider as DeChBankProvider
 from faker.providers.bank.el_GR import Provider as ElGrBankProvider
 from faker.providers.bank.en_GB import Provider as EnGbBankProvider
@@ -56,6 +57,21 @@ def test_bank(self, faker, num_samples):
             bank = faker.bank()
             assert bank in AzAzBankProvider.banks
 
+class TestCsCz:
+    """Test cs_CZ bank provider"""
+
+    def test_bban(self, faker, num_samples):
+        for _ in range(num_samples):
+            assert re.fullmatch(r"\d{20}", faker.bban())
+
+    def test_iban(self, faker, num_samples):
+        for _ in range(num_samples):
+            iban = faker.iban()
+            assert is_valid_iban(iban)
+            assert iban[:2] == CsCZBankProvider.country_code
+            assert re.fullmatch(r"\d{2}\d{20}", iban[2:])
+
+
 
 class TestNoNo:
     """Test no_NO bank provider"""