1 files changed, 17 insertions, 1 deletions
diff --git a/tests/hazmat/backends/test_multibackend.py b/tests/hazmat/backends/test_multibackend.py
index 168ed688..655acc44 100644
--- a/tests/hazmat/backends/test_multibackend.py
+++ b/tests/hazmat/backends/test_multibackend.py
@@ -19,7 +19,8 @@ from cryptography.exceptions import (
 )
 from cryptography.hazmat.backends.interfaces import (
     CMACBackend, CipherBackend, DSABackend, EllipticCurveBackend, HMACBackend,
-    HashBackend, PBKDF2HMACBackend, PKCS8SerializationBackend, RSABackend,
+    HashBackend, PBKDF2HMACBackend, PEMSerializationBackend,
+    PKCS8SerializationBackend, RSABackend,
     TraditionalOpenSSLSerializationBackend
 )
 from cryptography.hazmat.backends.multibackend import MultiBackend
@@ -211,6 +212,12 @@ class DummyTraditionalOpenSSLSerializationBackend(object):
         pass
 
 
+@utils.register_interface(PEMSerializationBackend)
+class DummyPEMSerializationBackend(object):
+    def load_pem_private_key(self, data, password):
+        pass
+
+
 class TestMultiBackend(object):
     def test_ciphers(self):
         backend = MultiBackend([
@@ -520,3 +527,12 @@ class TestMultiBackend(object):
         backend = MultiBackend([])
         with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_SERIALIZATION):
             backend.load_traditional_openssl_pem_private_key(b"keydata", None)
+
+    def test_pem_serialization_backend(self):
+        backend = MultiBackend([DummyPEMSerializationBackend()])
+
+        backend.load_pem_private_key(b"keydata", None)
+
+        backend = MultiBackend([])
+        with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_SERIALIZATION):
+            backend.load_pem_private_key(b"keydata", None)