5 files changed, 49 insertions, 5 deletions
diff --git a/tests/hazmat/primitives/test_ciphers.py b/tests/hazmat/primitives/test_ciphers.py
index 50cadf64..d9f83535 100644
--- a/tests/hazmat/primitives/test_ciphers.py
+++ b/tests/hazmat/primitives/test_ciphers.py
@@ -18,7 +18,7 @@ import binascii
 import pytest
 
 from cryptography.hazmat.primitives.ciphers.algorithms import (
-    AES, Camellia, TripleDES, Blowfish, ARC4, CAST5
+    AES, Camellia, TripleDES, Blowfish, ARC4, CAST5, IDEA
 )
 
 
@@ -110,3 +110,13 @@ class TestARC4(object):
     def test_invalid_key_size(self):
         with pytest.raises(ValueError):
             ARC4(binascii.unhexlify(b"0" * 34))
+
+
+class TestIDEA(object):
+    def test_key_size(self):
+        cipher = IDEA(b"\x00" * 16)
+        assert cipher.key_size == 128
+
+    def test_invalid_key_size(self):
+        with pytest.raises(ValueError):
+            IDEA(b"\x00" * 17)
diff --git a/tests/hazmat/primitives/test_hkdf.py b/tests/hazmat/primitives/test_hkdf.py
index e3e2a9df..963fb69c 100644
--- a/tests/hazmat/primitives/test_hkdf.py
+++ b/tests/hazmat/primitives/test_hkdf.py
@@ -17,7 +17,9 @@ import six
 
 import pytest
 
-from cryptography.exceptions import AlreadyFinalized, InvalidKey
+from cryptography.exceptions import (
+    AlreadyFinalized, InvalidKey, UnsupportedInterface
+)
 from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.primitives.kdf.hkdf import HKDF
 
@@ -145,3 +147,10 @@ class TestHKDF(object):
             )
 
             hkdf.verify(b"foo", six.u("bar"))
+
+
+def test_invalid_backend():
+    pretend_backend = object()
+
+    with pytest.raises(UnsupportedInterface):
+        HKDF(hashes.SHA256(), 16, None, None, pretend_backend)
diff --git a/tests/hazmat/primitives/test_pbkdf2hmac.py b/tests/hazmat/primitives/test_pbkdf2hmac.py
index f895935b..bf1e7f14 100644
--- a/tests/hazmat/primitives/test_pbkdf2hmac.py
+++ b/tests/hazmat/primitives/test_pbkdf2hmac.py
@@ -18,7 +18,7 @@ import six
 
 from cryptography import utils
 from cryptography.exceptions import (
-    InvalidKey, UnsupportedHash, AlreadyFinalized
+    InvalidKey, UnsupportedHash, AlreadyFinalized, UnsupportedInterface
 )
 from cryptography.hazmat.primitives import hashes, interfaces
 from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
@@ -67,3 +67,10 @@ class TestPBKDF2HMAC(object):
         kdf = PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, default_backend())
         with pytest.raises(TypeError):
             kdf.derive(six.u("unicode here"))
+
+
+def test_invalid_backend():
+    pretend_backend = object()
+
+    with pytest.raises(UnsupportedInterface):
+        PBKDF2HMAC(hashes.SHA1(), 20, b"salt", 10, pretend_backend)
diff --git a/tests/hazmat/primitives/twofactor/test_hotp.py b/tests/hazmat/primitives/twofactor/test_hotp.py
index bc907c9f..548c6264 100644
--- a/tests/hazmat/primitives/twofactor/test_hotp.py
+++ b/tests/hazmat/primitives/twofactor/test_hotp.py
@@ -17,7 +17,7 @@ import os
 
 import pytest
 
-from cryptography.exceptions import InvalidToken
+from cryptography.exceptions import InvalidToken, UnsupportedInterface
 from cryptography.hazmat.primitives.twofactor.hotp import HOTP
 from cryptography.hazmat.primitives import hashes
 from tests.utils import load_vectors_from_file, load_nist_vectors
@@ -95,3 +95,12 @@ class TestHOTP(object):
 
         with pytest.raises(TypeError):
             HOTP(secret, b"foo", SHA1(), backend)
+
+
+def test_invalid_backend():
+    secret = b"12345678901234567890"
+
+    pretend_backend = object()
+
+    with pytest.raises(UnsupportedInterface):
+        HOTP(secret, 8, hashes.SHA1(), pretend_backend)
diff --git a/tests/hazmat/primitives/twofactor/test_totp.py b/tests/hazmat/primitives/twofactor/test_totp.py
index f3bddb88..294c19ab 100644
--- a/tests/hazmat/primitives/twofactor/test_totp.py
+++ b/tests/hazmat/primitives/twofactor/test_totp.py
@@ -15,7 +15,7 @@ from __future__ import absolute_import, division, print_function
 
 import pytest
 
-from cryptography.exceptions import InvalidToken
+from cryptography.exceptions import InvalidToken, UnsupportedInterface
 from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.primitives.twofactor.totp import TOTP
 from tests.utils import load_vectors_from_file, load_nist_vectors
@@ -129,3 +129,12 @@ class TestTOTP(object):
         totp = TOTP(secret, 8, hashes.SHA1(), 30, backend)
 
         assert totp.generate(time) == b"94287082"
+
+
+def test_invalid_backend():
+    secret = b"12345678901234567890"
+
+    pretend_backend = object()
+
+    with pytest.raises(UnsupportedInterface):
+        TOTP(secret, 8, hashes.SHA1(), 30, pretend_backend)