[Scipy-svn] r4999 - trunk/scipy/signal/tests
scipy-svn@scip...
scipy-svn@scip...
Thu Nov 6 05:56:06 CST 2008
Author: cdavid
Date: 2008-11-06 05:55:41 -0600 (Thu, 06 Nov 2008)
New Revision: 4999
Modified:
trunk/scipy/signal/tests/test_filter_design.py
Log:
Check the warning works as expected for #651 case.
Modified: trunk/scipy/signal/tests/test_filter_design.py
===================================================================
--- trunk/scipy/signal/tests/test_filter_design.py 2008-11-06 11:54:41 UTC (rev 4998)
+++ trunk/scipy/signal/tests/test_filter_design.py 2008-11-06 11:55:41 UTC (rev 4999)
@@ -1,7 +1,9 @@
+import warnings
+
import numpy as np
from numpy.testing import TestCase, assert_array_almost_equal
-from scipy.signal import tf2zpk
+from scipy.signal import tf2zpk, bessel, BadCoefficients
class TestTf2zpk(TestCase):
def test_simple(self):
@@ -19,3 +21,18 @@
p.sort()
assert_array_almost_equal(z, z_r)
assert_array_almost_equal(p, p_r)
+
+ def test_bad_filter(self):
+ """Regression test for #651: better handling of badly conditionned
+ filter coefficients."""
+ b, a = bessel(20, 0.1)
+ warnings.simplefilter("error", BadCoefficients)
+ try:
+ try:
+ z, p, k = tf2zpk(b, a)
+ raise AssertionError("tf2zpk did not warn about bad "\
+ "coefficients")
+ except BadCoefficients:
+ pass
+ finally:
+ warnings.simplefilter("always", BadCoefficients)
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