diff --git a/tests/test_with_hypothesis.py b/tests/test_with_hypothesis.py
new file mode 100644
index 0000000..261a21d
--- /dev/null
+++ b/tests/test_with_hypothesis.py
@@ -0,0 +1,12 @@
+import pytest
+
+from cryptography.fernet import Fernet
+
+hypothesis = pytest.importorskip("hypothesis")
+
+
+@hypothesis.given(bytes)
+def test_fernet(data):
+    f = Fernet(Fernet.generate_key())
+    ct = f.encrypt(data)
+    assert f.decrypt(ct) == data