Description
See numpy/numpy#17761 and https://travis-ci.org/github/scipy/scipy/jobs/743059506#L19563-L19579. Until NumPy is fixed I think we should ignore failures of the form:
______________________ TestMinimumPhase.test_homomorphic _______________________
[gw0] linux -- Python 3.7.1 /home/travis/virtualenv/python3.7.1/bin/python
/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/scipy/signal/tests/test_fir_filter_design.py:609: in test_homomorphic
h_new = minimum_phase(np.convolve(h, h[::-1]))
h = [1, -1]
self = <scipy.signal.tests.test_fir_filter_design.TestMinimumPhase object at 0x7f8c07c6eef0>
/home/travis/virtualenv/python3.7.1/lib/python3.7/site-packages/scipy/signal/fir_filter_design.py:1247: in minimum_phase
np.log(h_temp, out=h_temp)
E RuntimeWarning: invalid value encountered in log
h = array([-1, 2, -1])
h_temp = array([-24.91900332, -8.80090757, -7.41465093, -6.60378348,
-6.02850719, -5.58233304, -5.21782799, -4.90... -4.64281529, -4.9096898 , -5.21782799, -5.58233304,
-6.02850719, -6.60378348, -7.41465093, -8.80090757])