optional spkg database_gap-4.4.12.p0.spkg fails test on sage-4.7.1.alpha1

[mariah]

The optional spkg database_gap-4.4.12.p0.spkg installed in sage-4.7.1.alpha1 causes the following test to fail:

eno% ./sage -t -long -force_lib "devel/sage/sage/groups/perm_gps/permgroup.py"
sage -t -long -force_lib "devel/sage/sage/groups/perm_gps/permgroup.py"
**********************************************************************
File "/home/mariah/sage/sage-4.7.1.alpha1-x86_64-Linux-core2-fc/devel/sage/sage/groups/perm_gps/permgroup.py", line 2350:
    sage: G.isomorphism_to(H)
Expected:
    Permutation group morphism:
      From: Permutation Group with generators [(2,3), (1,2,3)]
      To:   Permutation Group with generators [(1,2,4), (1,4)]
      Defn: [(2,3), (1,2,3)] -> [(2,4), (1,2,4)]
Got:
    Permutation group morphism:
      From: Permutation Group with generators [(2,3), (1,2,3)]
      To:   Permutation Group with generators [(1,2,4), (1,4)]
      Defn: [(2,3), (1,2,3)] -> [(2,4), (1,4,2)]
**********************************************************************

See #11582 for partially disabling this doctest.

[fbissey]

Do you mean installing the spkg leads to the failure? We have observed that exact same test failure since #10334 was introduced for the first time in the 4.7 release cycle in sage-on-gentoo  https://github.com/cschwan/sage-on-gentoo/issues/50

As far as we can see gap just seem to be very fussy in its behavior.

[fbissey]

After examination of that spkg I think that's definitely the cause of the problem in sage-on-gentoo. The content of this spkg is in the default gap tarball but sage stripe it to save space, it seems that the rest is put in this spkg. In gentoo we install gap in full.

It could be interesting to find out exactly which dataset cause the failure and why. But if the test is that sensitive it should be changed. I'll copy Mike Hansen and Nicolas Thiéry who did most of the work on #10334.

[jdemeyer]

On the buildbot machine  RHEL 5.5-64 bin (rosemary) the following error is observed:

sage -t -long  -force_lib devel/sage/sage/groups/perm_gps/permgroup.py
**********************************************************************
File "/home/buildbot/build/sage/rosemary-1/rosemary_binary/build/sage-4.7.1.rc0/devel/sage-main/sage/groups/perm_gps/permgroup.py", line 2350:
    sage: G.isomorphism_to(H)
Expected:
    Permutation group morphism:
      From: Permutation Group with generators [(2,3), (1,2,3)]
      To:   Permutation Group with generators [(1,2,4), (1,4)]
      Defn: [(2,3), (1,2,3)] -> [(2,4), (1,2,4)]
Got:
    Permutation group morphism:
      From: Permutation Group with generators [(2,3), (1,2,3)]
      To:   Permutation Group with generators [(1,2,4), (1,4)]
      Defn: [(2,3), (1,2,3)] -> [(1,2), (1,2,4)]
**********************************************************************

[jdemeyer]

See #11582 for partially disabling this doctest.

[was]

I also tested that with the optional spkg installed the doctest now works.

wstein@sage:/scratch/wstein/sd32/sage-4.7.2.alpha2$ ./sage -t -long -force_lib "devel/sage/sage/groups/perm_gps/permgroup.py"
sage -t -long -force_lib "devel/sage/sage/groups/perm_gps/permgroup.py"
         [15.0 s]
 
----------------------------------------------------------------------
All tests passed!
Total time for all tests: 15.1 seconds