From: Paul Brossier <piem@piem.org>
Date: Sat, 16 Sep 2017 21:44:54 +0000 (+0200)
Subject: python/tests/test_dct.py: add full tests
X-Git-Tag: 0.4.7~20^2~30
X-Git-Url: https://git.aubio.org/?a=commitdiff_plain;h=2bf590427e2a1f227be0a6391e025af3fc0ff2c0;p=aubio.git

python/tests/test_dct.py: add full tests
---

diff --git a/python/tests/test_dct.py b/python/tests/test_dct.py
new file mode 100755
index 00000000..4a87cc5e
--- /dev/null
+++ b/python/tests/test_dct.py
@@ -0,0 +1,61 @@
+#! /usr/bin/env python
+
+
+import numpy as np
+from numpy.testing import TestCase, assert_almost_equal
+import aubio
+
+class aubio_dct(TestCase):
+
+    def test_init(self):
+        """ check aubio.dct() can be created """
+        a_dct = aubio.dct()
+        self.assertEqual(a_dct.size, 1024)
+
+    def test_arange(self):
+        """ test that dct(arange(8)) is computed correctly
+
+        >>> from scipy.fftpack import dct
+        >>> a_in = np.arange(8).astype('float32')
+        >>> precomputed = dct(a_in, norm='ortho')
+        """
+        precomputed = [ 9.89949512, -6.44232273,  0., -0.67345482, 0.,
+                -0.20090288, 0., -0.05070186]
+        a_dct = aubio.dct(8)
+        a_in = np.arange(8).astype('float32')
+        a_expected = aubio.fvec(precomputed)
+        assert_almost_equal(a_dct(a_in), a_expected, decimal=6)
+
+    def test_some_ones(self):
+        """ test that dct(somevector) is computed correctly """
+        precomputed = [ 4.28539848,  0.2469689,  -0.14625292, -0.58121818,
+                -0.83483052, -0.75921834, -0.35168475,  0.24087936,
+                0.78539824, 1.06532764,  0.97632152,  0.57164496, 0.03688532,
+                -0.39446154, -0.54619485, -0.37771079]
+        a_dct = aubio.dct(16)
+        a_in = np.ones(16).astype('float32')
+        a_in[1] = 0
+        a_in[3] = np.pi
+        a_expected = aubio.fvec(precomputed)
+        assert_almost_equal(a_dct(a_in), a_expected, decimal=7)
+
+    def test_reconstruction(self):
+        a_dct = aubio.dct(16)
+        a_in = np.ones(16).astype('float32')
+        a_in[1] = 0
+        a_in[3] = np.pi
+        a_dct_in = a_dct(a_in)
+        a_dct_reconstructed = a_dct.rdo(a_dct_in)
+        assert_almost_equal(a_dct_reconstructed, a_in, decimal=6)
+
+    def test_negative_size(self):
+        with self.assertRaises(ValueError):
+            aubio.dct(-1)
+
+    def test_wrong_size(self):
+        # supports for non 2** fft sizes only when compiled with fftw3
+        try:
+            with self.assertRaises(RuntimeError):
+                aubio.dct(13)
+        except AssertionError:
+            self.skipTest('creating aubio.dct with size %d did not fail' % win_s)