sage -t --long --random-seed=233407191301051614325254530123917684827 /nix/store/fmcggxb3m1xvlsdqmi045p87xml9paca-sage-src-9.6/src/sage/geometry/cone_catalog.py
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File "/nix/store/fmcggxb3m1xvlsdqmi045p87xml9paca-sage-src-9.6/src/sage/geometry/cone_catalog.py", line 569, in sage.geometry.cone_catalog.schur
Failed example:
    majorized_by(x,y) == ( (y-x) in S )
Expected:
    True
Got:
    False
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1 item had failures:
   1 of  26 in sage.geometry.cone_catalog.schur
    [86 tests, 1 failure, 4.62 s]