python/tests/test_filterbank.py: raise a ValueError

diff --git a/python/tests/test_filterbank.py b/python/tests/test_filterbank.py
index bce832e..4bc70fb 100755 (executable)
--- a/python/tests/test_filterbank.py
+++ b/python/tests/test_filterbank.py
@@ -67,7 +67,7 @@ class aubio_filterbank_wrong_values(TestCase):
         self.assertRaises(ValueError, filterbank, 40, -20)
 
     def test_negative_filters(self):
-        self.assertRaises(RuntimeError, filterbank, -40, 1024)
+        self.assertRaises(ValueError, filterbank, -40, 1024)
 
     def test_filterbank_long_cvec(self):
         f = filterbank(40, 512)