diff --git a/tests/test-sshserver.py b/tests/test-sshserver.py
--- a/tests/test-sshserver.py
+++ b/tests/test-sshserver.py
@@ -14,12 +14,12 @@
 class SSHServerGetArgsTests(unittest.TestCase):
     def testparseknown(self):
         tests = [
-            ('* 0\nnodes 0\n', ['', {}]),
-            ('* 0\nnodes 40\n1111111111111111111111111111111111111111\n',
-             ['1111111111111111111111111111111111111111', {}]),
+            (b'* 0\nnodes 0\n', [b'', {}]),
+            (b'* 0\nnodes 40\n1111111111111111111111111111111111111111\n',
+             [b'1111111111111111111111111111111111111111', {}]),
         ]
         for input, expected in tests:
-            self.assertparse('known', input, expected)
+            self.assertparse(b'known', input, expected)
 
     def assertparse(self, cmd, input, expected):
         server = mockserver(input)