#! /usr/bin/env python from numpy.testing import TestCasefrom aubio import fvec, zero_crossing_rate buf_size = 2048 class zero_crossing_rate_test_case(TestCase):     def setUp(self):        self.vector = fvec(buf_size)     def test_zeroes(self):        """ check zero crossing rate on a buffer of 0. """        self.assertEqual(0., zero_crossing_rate(self.vector))     def test_ones(self):        """ check zero crossing rate on a buffer of 1. """        self.vector[:] = 1.        self.assertEqual(0., zero_crossing_rate(self.vector))     def test_impulse(self):        """ check zero crossing rate on a buffer with an impulse """        self.vector[int(buf_size / 2)] = 1.        self.assertEqual(0., zero_crossing_rate(self.vector))     def test_negative_impulse(self):        """ check zero crossing rate on a buffer with a negative impulse """        self.vector[int(buf_size / 2)] = -1.        self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))     def test_single(self):        """ check zero crossing rate on single crossing """        self.vector[int(buf_size / 2) - 1] = 1.        self.vector[int(buf_size / 2)] = -1.        self.assertEqual(2./buf_size, zero_crossing_rate(self.vector))     def test_single_with_gap(self):        """ check zero crossing rate on single crossing with a gap"""        self.vector[int(buf_size / 2) - 2] = 1.        self.vector[int(buf_size / 2)] = -1.        self.assertEqual(2./buf_size, zero_crossing_rate(self.vector)) if __name__ == '__main__':    from unittest import main    main()