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-rw-r--r--tests/test_fernet.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/tests/test_fernet.py b/tests/test_fernet.py
index 91af32ad..58f89cbf 100644
--- a/tests/test_fernet.py
+++ b/tests/test_fernet.py
@@ -146,3 +146,7 @@ class TestMultiFernet(object):
def test_no_fernets(self, backend):
with pytest.raises(ValueError):
MultiFernet([])
+
+ def test_non_iterable_argument(self, backend):
+ with pytest.raises(TypeError):
+ MultiFernet(None)