Pass the correct type to CRL.export.
diff --git a/OpenSSL/test/test_crypto.py b/OpenSSL/test/test_crypto.py
index 7f70091..ae973ab 100644
--- a/OpenSSL/test/test_crypto.py
+++ b/OpenSSL/test/test_crypto.py
@@ -3164,7 +3164,11 @@
in a :py:obj:`ValueError` being raised.
"""
crl = CRL()
- self.assertRaises(ValueError, crl.export, self.cert, self.pkey, FILETYPE_PEM, 10, "strange-digest")
+ self.assertRaises(
+ ValueError,
+ crl.export,
+ self.cert, self.pkey, FILETYPE_PEM, 10, b"strange-digest"
+ )
def test_get_revoked(self):