test_bad_values (traittypes.tests.test_traittypes.TestIntArray) fails for openSUSE

[mcepl]

When running the testsuite with Python 3.7.* on openSUSE (logs from building) I get reliably this error:

[   32s] ======================================================================
[   32s] FAIL: test_bad_values (traittypes.tests.test_traittypes.TestIntArray)
[   32s] ----------------------------------------------------------------------
[   32s] Traceback (most recent call last):
[   32s]   File "/usr/lib/python2.7/site-packages/traitlets/tests/test_traitlets.py", line 1095, in test_bad_values
[   32s]     assert False, value
[   32s] AssertionError: [1, [0, 0]]
[   32s] 
[   32s] ----------------------------------------------------------------------
[   32s] Ran 26 tests in 0.028s