python/tests/test_pitchshift.py: fix import

diff --git a/python/tests/test_pitchshift.py b/python/tests/test_pitchshift.py
index 940124f..37d9926 100755 (executable)
--- a/python/tests/test_pitchshift.py
+++ b/python/tests/test_pitchshift.py
@@ -1,6 +1,6 @@
 #! /usr/bin/env python
 
-from nose2 import TestCase
+from numpy.testing import TestCase
 import aubio
 
 class aubio_pitchshift(TestCase):