Mark test as only for PyCrypto and PyCryptodome

tests/test_jws.py

@@ -1,12 +1,18 @@
 import json
 import warnings
 
+import pytest
+
 from jose import jwk
 from jose import jws
 from jose.constants import ALGORITHMS
 from jose.exceptions import JWSError
 
-import pytest
+try:
+    from Crypto.PublicKey import RSA as PyCryptoRSA
+    from jose.backends.pycrypto_backend import RSAKey as PyCryptoRSAKey
+except ImportError:
+    PyCryptoRSA = PyCryptoRSAKey = None
 
 
 @pytest.fixture
@@ -292,6 +298,9 @@ def test_wrong_key(self, payload):
         with pytest.raises(JWSError):
             jws.verify(token, rsa_public_key, ALGORITHMS.HS256)
 
+    @pytest.mark.pycrypto
+    @pytest.mark.pycryptodome
+    @pytest.mark.skipif(None in (PyCryptoRSA, PyCryptoRSAKey), reason="Pycrypto/dome backend not available")
     def test_private_verify_raises_warning(self, payload):
         token = jws.sign(payload, rsa_private_key, algorithm='RS256')