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Travis CI tests are failing in semi-random ways and generating the following error:
FAIL: testConvert (control.tests.convert_test.TestConvert)Test state space to transfer function conversion.----------------------------------------------------------------------Traceback (most recent call last): File "/home/travis/build/python-control/python-control/control/tests/convert_test.py", line 86, in testConvert ssTransformed = matlab.ss(tfOriginal) File "/home/travis/build/python-control/python-control/control/statesp.py", line 1149, in ss return tf2ss(sys) File "/home/travis/build/python-control/python-control/control/statesp.py", line 1223, in tf2ss return _convertToStateSpace(sys) File "/home/travis/build/python-control/python-control/control/statesp.py", line 779, in _convertToStateSpace num, den = sys._common_den() File "/home/travis/build/python-control/python-control/control/xferfcn.py", line 821, in _common_den % quad.imag.max()AssertionError: Quadratic has a nontrivial imaginary part: 1.06581e-14The error is not always present and re-running the build sometimes fixes it. It appears the problem may be due to the way that random test cases are generated (although the seed is fixed in the unit test => not sure how we are getting different results on rebuild).
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