On Ubuntu 18.03 with few optional and external packages installed, I get

Using 
--optional=4ti2,argcomplete,build,ccache,cryptominisat,debian,dot2tex,e_antic,external,fricas,glucose,latte_int,lidia,normaliz,notedown,pandoc_attributes,pip,pycosat,pynormaliz,rst2ipynb,sage,sage_numerical_backends_coin,sage_spkg


----------------------------------------------------------------------
sage -t --long --random-seed=0 src/sage/calculus/calculus.py  # 1 doctest 
failed
sage -t --long --random-seed=0 
src/sage/combinat/designs/incidence_structures.py  # 1 doctest failed
sage -t --long --random-seed=0 src/sage/databases/findstat.py  # 9 doctests 
failed
sage -t --long --random-seed=0 src/sage/databases/oeis.py  # 5 doctests 
failed
sage -t --long --random-seed=0 src/sage/finance/stock.py  # 1 doctest failed
sage -t --long --random-seed=0 src/sage/graphs/generic_graph.py  # 2 
doctests failed
sage -t --long --random-seed=0 src/sage/graphs/graph.py  # 3 doctests failed
sage -t --long --random-seed=0 src/sage/tests/cmdline.py  # 2 doctests 
failed
----------------------------------------------------------------------
External software detected for doctesting: 
ffmpeg,graphviz,imagemagick,internet,latex,octave,pandoc

Rerunning failed tests, I get the same list. All failures are copied below.

The failures in graph.py and generic_graph.py are instances of 
https://trac.sagemath.org/ticket/30635

One of the two failures in cmdline.py is known 
(https://trac.sagemath.org/ticket/31475), the other failure is new to me 
(related to pandoc).

Other failures (findstat.py, oeis.py) are related to the unstability of 
stuff on the internet.

The failure with calculus.py is new to me.

sage -t --long --random-seed=0 src/sage/finance/stock.py
**********************************************************************
File "src/sage/finance/stock.py", line 553, in 
sage.finance.stock.Stock.load_from_file
Failed example:
    finance.Stock('aapl').load_from_file(filename)[:5]
Expected:
    doctest:warning...
    DeprecationWarning: Importing finance from here is deprecated...
    [
    1212408060 188.00 188.00 188.00 188.00        687,
    1212408000 188.00 188.11 188.00 188.00       2877,
    1212407700 188.00 188.00 188.00 188.00       1000,
    1212407640 187.75 188.00 187.75 188.00       2000,
    1212405780 187.80 187.80 187.80 187.80        100
    ]
Got:
    [
    1212408060 188.00 188.00 188.00 188.00        687,
    1212408000 188.00 188.11 188.00 188.00       2877,
    1212407700 188.00 188.00 188.00 188.00       1000,
    1212407640 187.75 188.00 187.75 188.00       2000,
    1212405780 187.80 187.80 187.80 187.80        100
    ]
**********************************************************************
1 item had failures:
   1 of   5 in sage.finance.stock.Stock.load_from_file
    22 tests not run due to known bugs
    0 tests not run because we ran out of time
    [26 tests, 1 failure, 0.02 s]






sage -t --long --random-seed=0 src/sage/databases/findstat.py
**********************************************************************
File "src/sage/databases/findstat.py", line 49, in sage.databases.findstat
Failed example:
    r = findstat([(m, m.number_of_nestings()) for n in range(6) for m in 
PM(2*n)]); r # optional -- internet
Expected:
    0: St000042oMp00116 (quality [100, 100])
    1: St000041 (quality [20, 100])
    ...
Got:
     0: St000042oMp00116 (quality [100, 100])
     1: St000042oMp00113oMp00116 (quality [100, 100])
     2: St000042oMp00116oMp00113 (quality [100, 100])
     3: St000042oMp00144oMp00116 (quality [100, 100])
     4: St000042oMp00145oMp00116 (quality [100, 100])
     5: St000041 (quality [20, 100])
     6: St000041oMp00113 (quality [20, 100])
     7: St000233oMp00092 (quality [16, 100])
     8: St000496oMp00092 (quality [16, 100])
     9: St000233oMp00112oMp00092 (quality [16, 100])
    10: St000496oMp00112oMp00092 (quality [16, 100])
    11: St000123oMp00087oMp00058 (quality [13, 70])
    12: St000232oMp00115oMp00092 (quality [13, 70])
    13: St000359oMp00087oMp00058 (quality [13, 70])
**********************************************************************
File "src/sage/databases/findstat.py", line 82, in sage.databases.findstat
Failed example:
    print(r[1].statistic().description())                                 # 
optional -- internet
Expected:
    The number of nestings of a perfect matching.
    <BLANKLINE>
    <BLANKLINE>
    This is the number of pairs of edges $((a,b), (c,d))$ such that $a\le 
c\le d\le b$. i.e., the edge $(c,d)$ is nested inside $(a,b)$...
Got:
    The number of crossings of a perfect matching. 
    
    This is the number of pairs of edges $((a,b),(c,d))$ such that $a\le 
c\le b\le d$, i.e., the edges $(a,b)$ and $(c,d)$ cross when drawing the 
perfect matching as a chord diagram.
    
    The generating function for perfect matchings $M$ of $\{1,\dots,2n\}$ 
according to the number of crossings $\textrm{cr}(M)$ is given by the 
Touchard-Riordan formula ([2], [4], a bijective proof is given in [7]):
    $$
    \sum_{M} q^{\textrm{cr}(M)}
    = \frac{1}{(1-q)^n} 
\sum_{k=0}^n\left(\binom{2n}{n-k}-\binom{2n}{n-k-1}\right)(-1)^k 
q^{\binom{k+1}{2}}
    $$
    <BLANKLINE>
**********************************************************************
File "src/sage/databases/findstat.py", line 90, in sage.databases.findstat
Failed example:
    r[1].statistic().references()                                         # 
optional -- internet
Expected:
    0: [1]  de Médicis, A., Viennot, X. G., Moments des $q$-polynômes de 
Laguerre et la bijection de Foata-Zeilberger [[MathSciNet:1288802]]
    1: [2]  Simion, R., Stanton, D., Octabasic Laguerre polynomials and 
permutation statistics [[MathSciNet:1418763]]...
Got:
    0: [1]  de Médicis, A., Viennot, X. G., Moments des $q$-polynômes de 
Laguerre et la bijection de Foata-Zeilberger [[MathSciNet:1288802]]
    1: [2]  Riordan, J., The distribution of crossings of chords joining 
pairs of $2n$ points on a circle [[MathSciNet:0366686]]
    2: [3]  Simion, R., Stanton, D., Octabasic Laguerre polynomials and 
permutation statistics [[MathSciNet:1418763]]
    3: [4]  Touchard, J., Sur un problème de configurations et sur les 
fractions continues [[MathSciNet:0046325]]
    4: [5]  Josuat-Vergès, M., Rubey, M., Crossings, Motzkin paths and 
moments [[MathSciNet:2819649]]
    5: [6]  Triangle read by rows: T(n,k) gives number of ways of arranging 
n chords on a circle with k simple intersections (i.e. no intersections 
with 3 or more chords) - positive values only. [[OEIS:A067311]]
    6: [7]  Penaud, J.-G., Une preuve bijective d'une formule de 
Touchard-Riordan [[MathSciNet:1336847]]
**********************************************************************
File "src/sage/databases/findstat.py", line 118, in sage.databases.findstat
Failed example:
    r = findstat(Permutations, lambda pi: pi.saliances()[0], depth=2); r  # 
optional -- internet
Expected:
    0: St000740oMp00066 with offset 1 (quality [100, 100])
    ...
    7: St000051oMp00061oMp00069 (quality [87, 86])
    ...
Got:
     0: St000740oMp00087 with offset 1 (quality [100, 100])
     1: St000740oMp00066 with offset 1 (quality [100, 100])
     2: St000476oMp00099oMp00127 (quality [100, 100])
     3: St000740oMp00236oMp00066 with offset 1 (quality [100, 100])
     4: St000740oMp00238oMp00066 with offset 1 (quality [100, 100])
     5: St000740oMp00089oMp00149 with offset 1 (quality [100, 100])
     6: St000740oMp00238oMp00087 with offset 1 (quality [100, 100])
     7: St000740oMp00236oMp00087 with offset 1 (quality [100, 100])
     8: St000740oMp00067oMp00062 with offset 1 (quality [99, 100])
     9: St000147oMp00027oMp00127 (quality [96, 100])
    10: St000740oMp00175oMp00062 with offset 1 (quality [91, 100])
    11: St000054oMp00066oMp00149 with offset 1 (quality [89, 100])
    12: St000054oMp00064oMp00062 with offset 1 (quality [88, 100])
    13: St000740oMp00175oMp00087 with offset 1 (quality [88, 100])
    14: St000740oMp00067oMp00087 with offset 1 (quality [88, 100])
    15: St000740oMp00175oMp00066 with offset 1 (quality [88, 100])
    16: St000740oMp00067oMp00066 with offset 1 (quality [88, 100])
    17: St000740oMp00062 with offset 1 (quality [87, 100])
    18: St000054oMp00064oMp00087 with offset 1 (quality [87, 100])
    19: St000054oMp00025oMp00127 with offset 1 (quality [87, 100])
    20: St000054oMp00064oMp00066 with offset 1 (quality [87, 100])
    21: St000141oMp00025oMp00127 (quality [87, 100])
    22: St000740oMp00238oMp00062 with offset 1 (quality [87, 100])
    23: St000740oMp00236oMp00062 with offset 1 (quality [87, 100])
    24: St001291oMp00127 with offset 1 (quality [87, 86])
    25: St000051oMp00061oMp00069 (quality [87, 86])
    26: St000051oMp00061oMp00149 (quality [87, 86])
    27: St000316oMp00025oMp00127 (quality [87, 86])
    28: St000653oMp00129oMp00127 (quality [87, 86])
    29: St000740oMp00089oMp00069 with offset 1 (quality [87, 86])
    30: St001184oMp00127oMp00064 with offset 1 (quality [87, 86])
    31: St001227oMp00028oMp00127 (quality [87, 86])
    32: St001291oMp00132oMp00127 with offset 1 (quality [87, 86])
    33: St001291oMp00124oMp00127 with offset 1 (quality [87, 86])
    34: St001291oMp00099oMp00127 with offset 1 (quality [87, 86])
    35: St001480oMp00118oMp00127 (quality [87, 86])
    36: St001480oMp00032oMp00127 (quality [87, 86])
    37: St000066oMp00063oMp00149 with offset 1 (quality [54, 86])
    38: St000066oMp00063oMp00069 with offset 1 (quality [54, 86])
    39: St000840oMp00146oMp00127 (quality [18, 86])
    40: St000199oMp00063 with offset 1 (quality [15, 71])
    41: St000193oMp00004oMp00063 with offset 1 (quality [15, 71])
    42: St000199oMp00137oMp00127 with offset 1 (quality [15, 71])
    43: St000200oMp00063oMp00062 with offset 1 (quality [15, 71])
    44: St000200oMp00005oMp00063 with offset 1 (quality [15, 71])
    45: St000200oMp00063oMp00087 with offset 1 (quality [15, 71])
    46: St000200oMp00035oMp00127 with offset 1 (quality [15, 71])
    47: St000200oMp00137oMp00127 with offset 1 (quality [15, 71])
    48: St000740oMp00201oMp00127 with offset 1 (quality [15, 71])
    49: St001291oMp00199oMp00127 with offset 1 (quality [15, 71])
**********************************************************************
File "src/sage/databases/findstat.py", line 127, in sage.databases.findstat
Failed example:
    r[0].info()                                                           # 
optional -- internet
Expected:
    after adding 1 to every value
    and applying
        Mp00066: inverse: Permutations -> Permutations
    to the objects (see `.compound_map()` for details)
    <BLANKLINE>
    your input matches
        St000740: The last entry of a permutation.
    <BLANKLINE>
    among the values you sent, 100 percent are actually in the database,
    among the distinct values you sent, 100 percent are actually in the 
database
Got:
    after adding 1 to every value
    and applying
        Mp00087: inverse first fundamental transformation: Permutations -> 
Permutations
    to the objects (see `.compound_map()` for details)
    <BLANKLINE>
    your input matches
        St000740: The last entry of a permutation.
    <BLANKLINE>
    among the values you sent, 100 percent are actually in the database,
    among the distinct values you sent, 100 percent are actually in the 
database
**********************************************************************
File "src/sage/databases/findstat.py", line 1053, in 
sage.databases.findstat.?
Failed example:
    findstat("graphs", lambda g: g.diameter() if g.is_connected() else 
None, max_values=100) # optional -- internet
Expected:
    0: St000259 (quality [100, 100])
Got:
    0: St000259 (quality [100, 100])
    1: St000259oMp00111oMp00157 (quality [61, 83])
    2: St000259oMp00157oMp00111 (quality [61, 83])
**********************************************************************
File "src/sage/databases/findstat.py", line 1231, in 
sage.databases.findstat.findmap
Failed example:
    q = findmap([(pi, pi.complement().increasing_tree_shape()) for pi in 
l], depth=2); q  # optional -- internet
Expected:
    0: Mp00061oMp00069 (quality [100])
Got:
    0: Mp00061oMp00069 (quality [97])
**********************************************************************
File "src/sage/databases/findstat.py", line 1236, in 
sage.databases.findstat.findmap
Failed example:
    p = findmap({pi: pi.complement().increasing_tree_shape() for pi in l}, 
depth=2); p    # optional -- internet
Expected:
    0: Mp00061oMp00069 (quality [100])
Got:
    0: Mp00061oMp00069 (quality [97])
**********************************************************************
File "src/sage/databases/findstat.py", line 2538, in 
sage.databases.findstat.FindStatStatisticQuery.?
Failed example:
    FindStatStatisticQuery(domain=12, data=data, depth=1)         # 
optional -- internet
Expected:
    0: St000041 (quality [99, 100])
    1: St000042oMp00116 (quality [99, 100])
    2: St000233oMp00092 (quality [99, 100])
    3: St000496oMp00092 (quality [99, 100])
    4: St001513oMp00058 (quality [15, 57])
Got:
    0: St000041 (quality [99, 100])
    1: St000041oMp00113 (quality [99, 100])
    2: St000042oMp00116 (quality [99, 100])
    3: St000233oMp00092 (quality [99, 100])
    4: St000496oMp00092 (quality [99, 100])
    5: St001513oMp00058 (quality [15, 57])
**********************************************************************
4 items had failures:
   5 of  17 in sage.databases.findstat
   1 of  42 in sage.databases.findstat.?
   1 of   4 in sage.databases.findstat.FindStatStatisticQuery.?
   2 of  12 in sage.databases.findstat.findmap
    11 webbrowser tests not run
    0 tests not run because we ran out of time
    [395 tests, 9 failures, 45.80 s]




sage -t --long --random-seed=0 src/sage/calculus/calculus.py
**********************************************************************
File "src/sage/calculus/calculus.py", line 1468, in 
sage.calculus.calculus.mma_free_limit
Failed example:
    mma_free_limit(sin(x)/x, x=0) # optional - internet
Exception raised:
    Traceback (most recent call last):
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 694, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File 
"/home/slabbe/GitBox/sage/local/lib/python3.9/site-packages/sage/doctest/forker.py",
 
line 1088, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.calculus.calculus.mma_free_limit[1]>", line 1, in 
<module>
        mma_free_limit(sin(x)/x, x=Integer(0)) # optional - internet
    TypeError: mma_free_limit() got an unexpected keyword argument 'x'
**********************************************************************
1 item had failures:
   1 of   4 in sage.calculus.calculus.mma_free_limit
    1 maple test not run
    3 mathematica tests not run
    0 tests not run because we ran out of time
    [460 tests, 1 failure, 19.92 s]




sage -t --long --random-seed=0 src/sage/databases/oeis.py
**********************************************************************
File "src/sage/databases/oeis.py", line 347, in sage.databases.oeis.OEIS
Failed example:
    fibo.comments()[1]                        # optional -- internet
Expected:
    "F(n+2) = number of binary sequences of length n that have no
    consecutive 0's."
Got:
    'In keeping with historical accounts (see the references by P. Singh 
and S. Kak), the generalized Fibonacci sequence a, b, a + b, a + 2b, 2a + 
3b, 3a + 5b, ... can also be described as the Gopala-Hemachandra numbers 
H(n) = H(n-1) + H(n-2), with F(n) = H(n) for a = b = 1, and Lucas sequence 
L(n) = H(n) for a = 2, b = 1. - Lekraj Beedassy, Jan 11 2015'
**********************************************************************
File "src/sage/databases/oeis.py", line 542, in 
sage.databases.oeis.OEIS.find_by_subsequence
Failed example:
    oeis.find_by_subsequence([2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 
377]) # optional -- internet
Expected:
    0: A000045: Fibonacci numbers: F(n) = F(n-1) + F(n-2) with F(0) = 0 and 
F(1) = 1.
    1: A212804: Expansion of (1 - x)/(1 - x - x^2).
    2: A177194: Fibonacci numbers whose decimal expansion does not contain 
any digit 0.
Got:
    0: A000045: Fibonacci numbers: F(n) = F(n-1) + F(n-2) with F(0) = 0 and 
F(1) = 1.
    1: A212804: Expansion of (1 - x)/(1 - x - x^2).
    2: A020695: Pisot sequence E(2,3).
**********************************************************************
File "src/sage/databases/oeis.py", line 1506, in 
sage.databases.oeis.OEISSequence.references
Failed example:
    w.references()                        # optional -- internet
Expected:
    ...A. H. Beiler, Recreations in the Theory of Numbers, Dover, NY, 1964, 
p. 52.
    ...
Got:
     0: N. G. W. H. Beeger, On the Congruence (p-1)! == -1 (mod p^2), 
Messenger of Mathematics, Vol. 49 (1920), pp. 177-178.
     1: Albert H. Beiler, Recreations in the Theory of Numbers, Dover, NY, 
1964, p. 52.
     2: Calvin C. Clawson, Mathematical Mysteries, Plenum Press, 1996, p. 
180.
     3: Richard Crandall and Carl Pomerance, Prime Numbers: A Computational 
Perspective, Springer, NY, 2001; see p. 29.
     4: G. H. Hardy and E. M. Wright, An Introduction to the Theory of 
Numbers, 5th ed., Oxford Univ. Press, 1979, th. 80.
     5: G. B. Mathews, Theory of Numbers Part I., Cambridge: Deighton, Bell 
and Co., London: George Bell and Sons, 1892, page 318.
     6: Paulo Ribenboim, My Numbers, My Friends: Popular Lectures on Number 
Theory, Springer Science & Business Media, 2000, ISBN 0-387-98911-0.
     7: Paulo Ribenboim, The Book of Prime Number Records. Springer-Verlag, 
NY, 2nd ed., 1989, p. 277.
     8: N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer 
Sequences, Academic Press, 1995 (includes this sequence).
     9: Ilan Vardi, Computational Recreations in Mathematica. 
Addison-Wesley, Redwood City, CA, 1991, p. 73.
    10: David Wells, The Penguin Dictionary of Curious and Interesting 
Numbers. Penguin Books, NY, 1986, 163.
**********************************************************************
File "src/sage/databases/oeis.py", line 1639, in 
sage.databases.oeis.OEISSequence.cross_references
Failed example:
    nbalanced.cross_references(fetch=True)    # optional -- internet
Expected:
    0: A049703: a(0) = 0; for n>0, a(n) = A005598(n)/2.
    1: A049695: Array T read by diagonals; ...
    2: A103116: a(n) = A005598(n) - 1.
    3: A000010: Euler totient function phi(n): count numbers <= n and prime 
to n.
Got:
    0: A049703: a(0) = 0; for n>0, a(n) = A005598(n)/2.
    1: A049695: Array T read by diagonals; T(i,j) is the number of 
nonnegative slopes of lines determined by 2 lattice points in [ 0,i ] X [ 
0,j ] if i > 0; T(0,j)=1 if j > 0; T(0,0)=0.
    2: A103116: a(n) = Sum_{i=1..n} (n-i+1)*phi(i).
    3: A000010: Euler totient function phi(n): count numbers <= n and prime 
to n.
**********************************************************************
File "src/sage/databases/oeis.py", line 1724, in 
sage.databases.oeis.OEISSequence.comments
Failed example:
    f.comments()[:3]                      # optional -- internet
Expected:
    0: Also sometimes called Lamé's sequence.
    1: F(n+2) = number of binary sequences of length n that have no 
consecutive 0's.
    2: F(n+2) = number of subsets of {1,2,...,n} that contain no 
consecutive integers.
Got:
    0: D. E. Knuth writes: "Before Fibonacci wrote his work, the sequence 
F_{n} had already been discussed by Indian scholars, who had long been 
interested in rhythmic patterns that are formed from one-beat and two-beat 
notes. The number of such rhythms having n beats altogether is F_{n+1}; 
therefore both Gopāla (before 1135) and Hemachandra (c. 1150) mentioned the 
numbers 1, 2, 3, 5, 8, 13, 21, ... explicitly." (TAOCP Vol. 1, 2nd ed.) - 
_Peter Luschny_, Jan 11 2015
    1: In keeping with historical accounts (see the references by P. Singh 
and S. Kak), the generalized Fibonacci sequence a, b, a + b, a + 2b, 2a + 
3b, 3a + 5b, ... can also be described as the Gopala-Hemachandra numbers 
H(n) = H(n-1) + H(n-2), with F(n) = H(n) for a = b = 1, and Lucas sequence 
L(n) = H(n) for a = 2, b = 1. - Lekraj Beedassy, Jan 11 2015
    2: Susantha Goonatilake writes: "[T]his sequence was well known in 
South Asia and used in the metrical sciences. Its development is attributed 
in part to Pingala (200 BC), later being associated with Virahanka (circa 
700 AD), Gopala (circa 1135), and Hemachandra (circa 1150)—all of whom 
lived and worked prior to Fibonacci." (Toward a Global Science: Mining 
Civilizational Knowledge, p. 126) - _Russ Cox_, Sep 8 2021
**********************************************************************
5 items had failures:
   1 of  20 in sage.databases.oeis.OEIS
   1 of   3 in sage.databases.oeis.OEIS.find_by_subsequence
   1 of   5 in sage.databases.oeis.OEISSequence.comments
   1 of   7 in sage.databases.oeis.OEISSequence.cross_references
   1 of   5 in sage.databases.oeis.OEISSequence.references
    5 webbrowser tests not run
    0 tests not run because we ran out of time
    [289 tests, 5 failures, 33.47 s]



sage -t --long --random-seed=0 src/sage/tests/cmdline.py
**********************************************************************
File "src/sage/tests/cmdline.py", line 606, in 
sage.tests.cmdline.test_executable
Failed example:
    err  # optional - internet
Expected:
    ''
Got:
    
'/home/slabbe/GitBox/sage/local/lib/python3.9/site-packages/sage/misc/package.py:116:
 
UserWarning: failed to fetch the version of pkg=\'ore_algebra\' at 
https://pypi.org/pypi/ore_algebra/json\n  warnings.warn("failed to fetch 
the version of pkg={!r} at {}".format(pkg, url))\n'
**********************************************************************
File "src/sage/tests/cmdline.py", line 732, in 
sage.tests.cmdline.test_executable
Failed example:
    print(open(output, 'r').read() == t)          # optional - pandoc
Expected:
    True
Got:
    False
**********************************************************************
1 item had failures:
   2 of 250 in sage.tests.cmdline.test_executable
    3 gdb tests not run
    4 r tests not run
    0 tests not run because we ran out of time
    [249 tests, 2 failures, 44.38 s]



sage -t --long --random-seed=0 src/sage/graphs/generic_graph.py
**********************************************************************
File "src/sage/graphs/generic_graph.py", line 9026, in 
sage.graphs.generic_graph.GenericGraph.nowhere_zero_flow
Failed example:
    h = g.nowhere_zero_flow(k=3)
Expected:
    Traceback (most recent call last):
    ...
    EmptySetError: the problem has no feasible solution
Got:
    <BLANKLINE>
**********************************************************************
File "src/sage/graphs/generic_graph.py", line 9654, in 
sage.graphs.generic_graph.GenericGraph.?
Failed example:
    p1,p2 = g.disjoint_routed_paths([((0, 0), (4, 4)), ((0, 4), (4, 0))])
Expected:
    Traceback (most recent call last):
    ...
    EmptySetError: the disjoint routed paths do not exist
Got:
    <BLANKLINE>
**********************************************************************
2 items had failures:
   1 of 1050 in sage.graphs.generic_graph.GenericGraph.?
   1 of  29 in sage.graphs.generic_graph.GenericGraph.nowhere_zero_flow
    17 bliss tests not run
    6 not tested tests not run
    39 python_igraph tests not run
    0 tests not run because we ran out of time
    [3609 tests, 2 failures, 45.18 s]




sage -t --long --random-seed=0 src/sage/graphs/graph.py
**********************************************************************
File "src/sage/graphs/graph.py", line 4287, in sage.graphs.graph.Graph.?
Failed example:
    g.has_homomorphism_to(graphs.CycleGraph(4)) is not False
Expected:
    False
Got:
    True
**********************************************************************
File "src/sage/graphs/graph.py", line 4694, in sage.graphs.graph.Graph.minor
Failed example:
    L = g.minor(graphs.CompleteGraph(3))
Expected:
    Traceback (most recent call last):
    ...
    ValueError: This graph has no minor isomorphic to H !
Got:
    <BLANKLINE>
**********************************************************************
File "src/sage/graphs/graph.py", line 5909, in sage.graphs.graph.Graph.?
Failed example:
    g.topological_minor(graphs.CycleGraph(3))
Expected:
    False
Got:
    Subgraph of (Subgraph of (RandomGNP(15,0.300000000000000))): Graph on 0 
vertices
**********************************************************************
2 items had failures:
   2 of 279 in sage.graphs.graph.Graph.?
   1 of  14 in sage.graphs.graph.Graph.minor
    2 mcqd tests not run
    2 not tested tests not run
    13 python_igraph tests not run
    0 tests not run because we ran out of time
    [1216 tests, 3 failures, 25.72 s]


sage -t --long --random-seed=0 
src/sage/combinat/designs/incidence_structures.py
**********************************************************************
File "src/sage/combinat/designs/incidence_structures.py", line 2042, in 
sage.combinat.designs.incidence_structures.IncidenceStructure.?
Failed example:
    len(designs.steiner_triple_system(7).coloring())
Expected:
    3
Got:
    2
**********************************************************************
1 item had failures:
   1 of  35 in 
sage.combinat.designs.incidence_structures.IncidenceStructure.?
    8 gap_packages tests not run
    3 not tested tests not run
    0 tests not run because we ran out of time
    [339 tests, 1 failure, 1.39 s]

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