Thanks for the release. I am quite happy that #20343 is now in!

Testing on Ubuntu 18.04 with few optional and external packages, I get:

----------------------------------------------------------------------
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/combinat/designs/incidence_structures.py  # 1 doctest failed
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/geometry/polyhedron/base.py  # 1 doctest failed
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/graphs/generic_graph.py  # 2 doctests failed
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/graphs/graph.py  # 3 doctests failed
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/interfaces/expect.py  # 2 doctests failed
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/interfaces/mathematica.py  # 1 doctest failed
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/numerical/backends/glpk_backend.pyx  # 4 doctests failed
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/numerical/mip.pyx  # 8 doctests failed
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/tests/books/computational-mathematics-with-sagemath/lp_doctest.py 
 # 2 doctests failed
sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/tests/cmdline.py  # 1 doctest failed
----------------------------------------------------------------------
Features detected for doctesting: 
dvipng,ffmpeg,graphviz,imagemagick,internet,latex,latex_package_tkz_graph,lualatex,nauty,octave,palp,pandoc,pdf2svg,pdflatex,pdftocairo,sage.combinat,sage.geometry.polyhedron,sage.graphs,sage.groups,sage.plot,sage.rings.number_field,sage.rings.padics,sage.rings.real_double,sage.symbolic,sagemath_doc_html,sphinx,xelatex

Rerunning failed doctests, I get:

----------------------------------------------------------------------
sage -t --long --random-seed=253857822428465768945439832358430332549 
src/sage/combinat/designs/incidence_structures.py  # 1 doctest failed
sage -t --long --random-seed=253857822428465768945439832358430332549 
src/sage/geometry/polyhedron/base.py  # 1 doctest failed
sage -t --long --random-seed=253857822428465768945439832358430332549 
src/sage/graphs/generic_graph.py  # 2 doctests failed
sage -t --long --random-seed=253857822428465768945439832358430332549 
src/sage/graphs/graph.py  # 3 doctests failed
sage -t --long --random-seed=253857822428465768945439832358430332549 
src/sage/numerical/backends/glpk_backend.pyx  # 4 doctests failed
sage -t --long --random-seed=253857822428465768945439832358430332549 
src/sage/numerical/mip.pyx  # 8 doctests failed
sage -t --long --random-seed=253857822428465768945439832358430332549 
src/sage/tests/books/computational-mathematics-with-sagemath/lp_doctest.py 
 # 2 doctests failed
sage -t --long --random-seed=253857822428465768945439832358430332549 
src/sage/tests/cmdline.py  # 1 doctest failed
----------------------------------------------------------------------
Features detected for doctesting: 
graphviz,internet,latex,pandoc,sage.combinat,sage.graphs,sage.groups,sage.rings.number_field,sage.symbolic


As you see, failures with interfaces/mathmematica.py and 
interfaces/expect.py did not reproduce. I copy the non-reproducible 
failures below.


sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/interfaces/mathematica.py
**********************************************************************
File "src/sage/interfaces/mathematica.py", line 1228, in 
sage.interfaces.mathematica.parse_moutput_from_json
Failed example:
    sorted(L)                                             # optional 
internet
Expected:
    ['-Cos[x]', '{x == 0}', '{x == Pi C[1], Element[C[1], Integers]}']
Got:
    ['-Cos[x]']
**********************************************************************
1 item had failures:
   1 of  10 in sage.interfaces.mathematica.parse_moutput_from_json
    121 mathematica tests not run
    3 mathematicafrontend tests not run
    0 tests not run because we ran out of time
    [35 tests, 1 failure, 9.63 s]

sage -t --long --random-seed=290149003222784740688944140527868655673 
src/sage/interfaces/expect.py
**********************************************************************
File "src/sage/interfaces/expect.py", line 920, in 
sage.interfaces.expect.Expect._eval_line
Failed example:
    singular.interrupt()
Expected:
    True
Got:
    False
**********************************************************************
File "src/sage/interfaces/expect.py", line 926, in 
sage.interfaces.expect.Expect._eval_line
Failed example:
    singular('2+3')
Expected:
    Singular crashed -- automatically restarting.
    5
Got:
    5
**********************************************************************
1 item had failures:
   2 of  16 in sage.interfaces.expect.Expect._eval_line
    0 tests not run because we ran out of time
    [102 tests, 2 failures, 18.49 s]


Other failures are already tracked at: 
https://trac.sagemath.org/ticket/25536

In particular, I figured out the problem with failures because "Long-step 
dual simplex will be used" gets printed which involves 4 of the files 
above. It is because such warnings are not ignored with the presence of # 
abs tol comments.
See https://trac.sagemath.org/ticket/33588


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