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[py] [test] expect a small rounding error when using double precision

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

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

@@ -3,7 +3,7 @@

 from __future__ import unicode_literals

-from aubio import note2midi, freq2note, note2freq

+from aubio import note2midi, freq2note, note2freq, float_type

 from nose2.tools import params

 import unittest

@@ -127,7 +127,10 @@

     def test_note2freq_under(self):

         " make sure note2freq(A4) == 440"

-        self.assertEqual(440, note2freq("A4"))

+        if float_type == 'float32':

+            self.assertEqual(440, note2freq("A4"))

+        else:

+            self.assertLess(abs(note2freq("A4")-440), 1.e-12)

 if __name__ == '__main__':

     import nose2