tests: Exercise negative variant_level for UnixFd type

Signed-off-by: Simon McVittie <smcv@collabora.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/test/test-standalone.py b/test/test-standalone.py
index cd967a6..7ec6e47 100755
--- a/test/test-standalone.py
+++ b/test/test-standalone.py
@@ -612,6 +612,9 @@ class TestMessageMarshalling(unittest.TestCase):
 
                 with self.assertRaises(TypeError):
                     types.UnixFd(plain_fd, variant_level='nope')
+
+                with self.assertRaises(ValueError):
+                    types.UnixFd(plain_fd, variant_level=-1)
         finally:
             os.close(plain_fd)