added test for functions, bug fixes in add

1 files changed, 53 insertions, 0 deletions

diff --git a/test/test_function.py b/test/test_function.py
new file mode 100644
index 0000000..386b999
--- /dev/null
+++ b/test/test_function.py
@@ -0,0 +1,53 @@
+""" test_function.py
+
+Tests the PieceWiseConst and PieceWiseLinear functions
+
+Copyright 2014, Mario Mulansky <mario.mulansky@gmx.net>
+"""
+
+from __future__ import print_function
+import numpy as np
+from copy import copy
+from numpy.testing import assert_equal, assert_almost_equal, \
+    assert_array_almost_equal
+
+import pyspike as spk
+
+def test_pwc():
+    # some random data
+    x = [0.0, 1.0, 2.0, 2.5, 4.0]
+    y = [1.0, -0.5, 1.5, 0.75]
+    f = spk.PieceWiseConstFunc(x, y)
+    xp, yp = f.get_plottable_data()
+    
+    xp_expected = [0.0, 1.0, 1.0, 2.0, 2.0, 2.5, 2.5, 4.0]
+    yp_expected = [1.0, 1.0, -0.5, -0.5, 1.5, 1.5, 0.75, 0.75]
+    assert_array_almost_equal(xp, xp_expected)
+    assert_array_almost_equal(yp, yp_expected)
+
+    assert_almost_equal(f.avrg(), (1.0-0.5+0.5*1.5+1.5*0.75)/4.0, decimal=16)
+    assert_almost_equal(f.abs_avrg(), (1.0+0.5+0.5*1.5+1.5*0.75)/4.0,
+                        decimal=16)
+
+    f1 = copy(f)
+    x = [0.0, 0.75, 2.0, 2.5, 2.7, 4.0]
+    y = [0.5, 1.0, -0.25, 0.0, 1.5]
+    f2 = spk.PieceWiseConstFunc(x, y)
+    f1.add(f2)
+    x_expected = [0.0, 0.75, 1.0, 2.0, 2.5, 2.7, 4.0]
+    y_expected = [1.5, 2.0, 0.5, 1.25, 0.75, 2.25]
+    assert_array_almost_equal(f1.x, x_expected, decimal=16)
+    assert_array_almost_equal(f1.y, y_expected, decimal=16)
+
+    f2.add(f)
+    assert_array_almost_equal(f2.x, x_expected, decimal=16)
+    assert_array_almost_equal(f2.y, y_expected, decimal=16)
+    
+    f1.add(f2)
+    # same x, but y doubled
+    assert_array_almost_equal(f1.x, f2.x, decimal=16)
+    assert_array_almost_equal(f1.y, 2*f2.y, decimal=16)
+
+
+if __name__ == "__main__":
+    test_pwc()