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python/tests/test_filterbank.py: check for wrong values

--- a/python/tests/test_filterbank.py

+++ b/python/tests/test_filterbank.py

@@ -61,6 +61,14 @@

         f.set_mel_coeffs_slaney(16000)

         assert_almost_equal ( expected, f.get_coeffs() )

+class aubio_filterbank_wrong_values(TestCase):

+

+    def test_negative_window(self):

+        self.assertRaises(ValueError, filterbank, 40, -20)

+

+    def test_negative_filters(self):

+        self.assertRaises(RuntimeError, filterbank, -40, 1024)

+

     def test_filterbank_long_cvec(self):

         f = filterbank(40, 512)

         with self.assertRaises(ValueError):