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[py] [test] make sure freq2note rounds to nearest integer midi note

--- a/python/tests/test_note2midi.py

+++ b/python/tests/test_note2midi.py

@@ -111,9 +111,13 @@

 class freq2note_simple_test(unittest.TestCase):

-    def test_freq2note(self):

+    def test_freq2note_above(self):

         " make sure freq2note(441) == A4 "

         self.assertEqual("A4", freq2note(441))

+

+    def test_freq2note_under(self):

+        " make sure freq2note(439) == A4 "

+        self.assertEqual("A4", freq2note(439))

 if __name__ == '__main__':

     import nose2