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-rw-r--r--tests/hazmat/primitives/twofactor/test_hotp.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/tests/hazmat/primitives/twofactor/test_hotp.py b/tests/hazmat/primitives/twofactor/test_hotp.py
index 4c726b77..0f8c4a53 100644
--- a/tests/hazmat/primitives/twofactor/test_hotp.py
+++ b/tests/hazmat/primitives/twofactor/test_hotp.py
@@ -87,3 +87,9 @@ class TestHOTP(object):
with pytest.raises(InvalidToken):
hotp.verify(b"123456", counter)
+
+ def test_length_not_int(self, backend):
+ secret = b"12345678901234567890"
+
+ with pytest.raises(TypeError):
+ HOTP(secret, b"foo", SHA1(), backend)