Testing with few optional and external packages on Ubuntu 18.04, I get
failures with 8 files:
----------------------------------------------------------------------
sage -t --long --random-seed=244716197900726204861772829584257473787
src/sage/tests/books/computational-mathematics-with-sagemath/lp_doctest.py
# 2 doctests failed
sage -t --long --random-seed=244716197900726204861772829584257473787
src/sage/numerical/backends/glpk_backend.pyx # 4 doctests failed
sage -t --long --random-seed=244716197900726204861772829584257473787
src/sage/numerical/mip.pyx # 8 doctests failed
sage -t --long --random-seed=244716197900726204861772829584257473787
src/sage/combinat/designs/incidence_structures.py # 1 doctest failed
sage -t --long --random-seed=244716197900726204861772829584257473787
src/sage/graphs/generic_graph.py # 2 doctests failed
sage -t --long --random-seed=244716197900726204861772829584257473787
src/sage/geometry/polyhedron/base.py # 1 doctest failed
sage -t --long --random-seed=244716197900726204861772829584257473787
src/sage/graphs/graph.py # 3 doctests failed
sage -t --long --random-seed=244716197900726204861772829584257473787
src/sage/tests/cmdline.py # 1 doctest failed
----------------------------------------------------------------------
Failures involving half of the above files are of the following form:
**********************************************************************
File "src/sage/numerical/mip.pyx", line 2925, in
sage.numerical.mip.MixedIntegerLinearProgram.get_relative_objective_gap
Failed example:
p.solve() # rel tol 100
Expected:
1.0
Got:
Long-step dual simplex will be used
1.0
**********************************************************************
This is due to the fact that warnings like "Long-step dual simplex will be
used" are not ignored by the check_output method when some tolerance like
`# rel tol 100` are given. A fix is available here:
#33588 warnings to ignore are not ignored when a doctest is tagged with #
tol
https://trac.sagemath.org/ticket/33588 (needs review)
Other failures are known, follow up at
https://trac.sagemath.org/ticket/25536
Sébastien
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