2 files changed, 20 insertions, 0 deletions
diff --git a/tests/hazmat/bindings/test_openssl.py b/tests/hazmat/bindings/test_openssl.py
index 9f27aab7..7ad1ea75 100644
--- a/tests/hazmat/bindings/test_openssl.py
+++ b/tests/hazmat/bindings/test_openssl.py
@@ -70,3 +70,7 @@ class TestOpenSSL(object):
         )
         with pytest.raises(UnsupportedAlgorithm):
             cipher.encryptor()
+
+    def test_handle_unknown_error(self):
+        with pytest.raises(SystemError):
+            backend._handle_error_code(0, 0, 0)
diff --git a/tests/hazmat/primitives/test_block.py b/tests/hazmat/primitives/test_block.py
index 9460c53d..ea40127e 100644
--- a/tests/hazmat/primitives/test_block.py
+++ b/tests/hazmat/primitives/test_block.py
@@ -108,3 +108,19 @@ class TestCipherContext(object):
 
         with pytest.raises(UnsupportedAlgorithm):
             cipher.decryptor()
+
+    def test_incorrectly_padded(self, backend):
+        cipher = Cipher(
+            algorithms.AES(b"\x00" * 16),
+            modes.CBC(b"\x00" * 16),
+            backend
+        )
+        encryptor = cipher.encryptor()
+        encryptor.update(b"1")
+        with pytest.raises(ValueError):
+            encryptor.finalize()
+
+        decryptor = cipher.decryptor()
+        decryptor.update(b"1")
+        with pytest.raises(ValueError):
+            decryptor.finalize()