python/tests/test_fvec_shift.py: add tests for shift() and ishift()

diff --git a/python/tests/test_fvec_shift.py b/python/tests/test_fvec_shift.py
new file mode 100644 (file)
index 0000000..929fd56
--- /dev/null
+++ b/python/tests/test_fvec_shift.py
@@ -0,0 +1,35 @@
+#! /usr/bin/env python
+
+import numpy as np
+from numpy.testing import TestCase, assert_equal
+import aubio
+
+class aubio_shift_test_case(TestCase):
+
+    def run_shift_ishift(self, n):
+        ramp = np.arange(n, dtype=aubio.float_type)
+        # construct expected output
+        # even length: [5. 6. 7. 8. 9. 0. 1. 2. 3. 4.]
+        # odd length: [4. 5. 6. 0. 1. 2. 3.]
+        half = n - n//2
+        expected = np.concatenate([np.arange(half, n), np.arange(half)])
+        # shift in place, returns modified copy
+        assert_equal(aubio.shift(ramp), expected)
+        # check input was changed as expected
+        assert_equal(ramp, expected)
+        # construct expected output
+        expected = np.arange(n)
+        # revert shift in place, returns modifed copy
+        assert_equal(aubio.ishift(ramp), expected)
+        # check input was shifted back
+        assert_equal(ramp, expected)
+
+    def test_can_shift_fvec(self):
+        self.run_shift_ishift(10)
+
+    def test_can_shift_fvec_odd(self):
+        self.run_shift_ishift(7)
+
+from unittest import main
+if __name__ == '__main__':
+    main()