./sage --pip install pycryptosat # (this gets the package from PyPI
and builds it)

makes

./sage -t --long --random-seed=277349812120896257585806851727004727044
src/sage/sat/boolean_polynomials.py

work for me.

On Thu, Jan 13, 2022 at 5:27 PM Sébastien Labbé <[email protected]> wrote:
>
> On Ubuntu 20.04, when I ran `make ptestlong`, I obtain
>
> ----------------------------------------------------------------------
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/sat/boolean_polynomials.py  # 18 doctests failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/graphs/generic_graph.py  # 2 doctests failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/graphs/graph.py  # 3 doctests failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/rings/polynomial/multi_polynomial_sequence.py  # 1 doctest failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/interfaces/expect.py  # 2 doctests failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/combinat/matrices/dancing_links.pyx  # 1 doctest failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/combinat/designs/incidence_structures.py  # 1 doctest failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/doc/en/reference/sat/index.rst  # 2 doctests failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/sat/solvers/satsolver.pyx  # 5 doctests failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/sat/solvers/cryptominisat.py  # 38 doctests failed
> ----------------------------------------------------------------------
> Total time for all tests: 2916.3 seconds
>     cpu time: 17168.4 seconds
>     cumulative wall time: 22791.9 seconds
> Features detected for doctesting: 
> dvipng,ffmpeg,graphviz,imagemagick,pandoc,pdf2svg,sage.combinat,sage.geometry.polyhedron,sage.graphs,sage.plot,sage.rings.number_field,sage.rings.real_double,sage.symbolic,sagemath_doc_html,sphinx
>
> The failures of the following 6 six files are related to cryptominisat:
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/sat/boolean_polynomials.py  # 18 doctests failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/rings/polynomial/multi_polynomial_sequence.py  # 1 doctest failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/combinat/matrices/dancing_links.pyx  # 1 doctest failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/doc/en/reference/sat/index.rst  # 2 doctests failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/sat/solvers/satsolver.pyx  # 5 doctests failed
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/sat/solvers/cryptominisat.py  # 38 doctests failed
>
> The optional spkg cryptominisat is installed on my machine:
>
> $ sage -optional | grep cryptominisat
> cryptominisat...........................5.6.8 (5.6.8)
>
> But it seems the feature is broken for me.
>
> Failures are copied below.
>
> Follow up at https://trac.sagemath.org/ticket/25536
>
>
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/sat/boolean_polynomials.py
> **********************************************************************
> File "src/sage/sat/boolean_polynomials.py", line 85, in 
> sage.sat.boolean_polynomials.solve
> Failed example:
>     s = solve_sat(F)                                            # optional - 
> cryptominisat
> Exception raised:
>     Traceback (most recent call last):
>       File "sage/misc/lazy_import.pyx", line 253, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2866)
>         self._object = getattr(__import__(self._module, {}, {}, 
> [self._name]), self._name)
>     ModuleNotFoundError: No module named 'pycryptosat'
>
>     During handling of the above exception, another exception occurred:
>
>     Traceback (most recent call last):
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 694, in _run
>         self.compile_and_execute(example, compiler, test.globs)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 1088, in compile_and_execute
>         exec(compiled, globs)
>       File "<doctest sage.sat.boolean_polynomials.solve[3]>", line 1, in 
> <module>
>         s = solve_sat(F)                                            # 
> optional - cryptominisat
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/sat/boolean_polynomials.py",
>  line 252, in solve
>         solver = solver(**solver_kwds)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/sat/solvers/cryptominisat.py",
>  line 69, in __init__
>         self._solver = Solver(verbose=int(verbosity), 
> confl_limit=int(confl_limit), threads=int(threads))
>       File "sage/misc/lazy_import.pyx", line 391, in 
> sage.misc.lazy_import.LazyImport.__call__ 
> (build/cythonized/sage/misc/lazy_import.c:4183)
>         return self.get_object()(*args, **kwds)
>       File "sage/misc/lazy_import.pyx", line 217, in 
> sage.misc.lazy_import.LazyImport.get_object 
> (build/cythonized/sage/misc/lazy_import.c:2543)
>         return self._get_object()
>       File "sage/misc/lazy_import.pyx", line 256, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2981)
>         raise FeatureNotPresentError(self._feature, reason=f'Importing 
> {self._name} failed: {e}')
>     sage.features.FeatureNotPresentError: pycryptosat is not available.
>     Importing Solver failed: No module named 'pycryptosat'
>     No equivalent system packages for debian are known to Sage.
>     To install pycryptosat using the Sage package manager, you can try to run:
>       !sage -i cryptominisat
>     No equivalent system packages for pip are known to Sage.
> **********************************************************************
> File "src/sage/sat/boolean_polynomials.py", line 86, in 
> sage.sat.boolean_polynomials.solve
> Failed example:
>     F.subs(s[0])                                                # optional - 
> cryptominisat
> Exception raised:
>     Traceback (most recent call last):
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 694, in _run
>         self.compile_and_execute(example, compiler, test.globs)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 1088, in compile_and_execute
>         exec(compiled, globs)
>       File "<doctest sage.sat.boolean_polynomials.solve[4]>", line 1, in 
> <module>
>         F.subs(s[Integer(0)])                                                
> # optional - cryptominisat
>     KeyError: 0
> **********************************************************************
>
>
>
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/combinat/matrices/dancing_links.pyx
> **********************************************************************
> File "src/sage/combinat/matrices/dancing_links.pyx", line 925, in 
> sage.combinat.matrices.dancing_links.dancing_linksWrapper.to_sat_solver
> Failed example:
>     x.to_sat_solver('cryptominisat')          # optional - cryptominisat
> Exception raised:
>     Traceback (most recent call last):
>       File "sage/misc/cachefunc.pyx", line 1943, in 
> sage.misc.cachefunc.CachedMethodCaller.__call__ 
> (build/cythonized/sage/misc/cachefunc.c:10347)
>         return cache[k]
>     KeyError: (('cryptominisat',), ())
>
>     During handling of the above exception, another exception occurred:
>
>     Traceback (most recent call last):
>       File "sage/misc/lazy_import.pyx", line 253, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2866)
>         self._object = getattr(__import__(self._module, {}, {}, 
> [self._name]), self._name)
>     ModuleNotFoundError: No module named 'pycryptosat'
>
>     During handling of the above exception, another exception occurred:
>
>     Traceback (most recent call last):
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 694, in _run
>         self.compile_and_execute(example, compiler, test.globs)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 1088, in compile_and_execute
>         exec(compiled, globs)
>       File "<doctest 
> sage.combinat.matrices.dancing_links.dancing_linksWrapper.to_sat_solver[4]>", 
> line 1, in <module>
>         x.to_sat_solver('cryptominisat')          # optional - cryptominisat
>       File "sage/misc/cachefunc.pyx", line 1948, in 
> sage.misc.cachefunc.CachedMethodCaller.__call__ 
> (build/cythonized/sage/misc/cachefunc.c:10483)
>         w = self._instance_call(*args, **kwds)
>       File "sage/misc/cachefunc.pyx", line 1824, in 
> sage.misc.cachefunc.CachedMethodCaller._instance_call 
> (build/cythonized/sage/misc/cachefunc.c:9949)
>         return self.f(self._instance, *args, **kwds)
>       File "sage/combinat/matrices/dancing_links.pyx", line 930, in 
> sage.combinat.matrices.dancing_links.dancing_linksWrapper.to_sat_solver 
> (build/cythonized/sage/combinat/matrices/dancing_links.cpp:7158)
>         s = SAT(solver)
>       File "sage/sat/solvers/satsolver.pyx", line 382, in 
> sage.sat.solvers.satsolver.SAT 
> (build/cythonized/sage/sat/solvers/satsolver.c:3268)
>         return CryptoMiniSat(*args, **kwds)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/sat/solvers/cryptominisat.py",
>  line 69, in __init__
>         self._solver = Solver(verbose=int(verbosity), 
> confl_limit=int(confl_limit), threads=int(threads))
>       File "sage/misc/lazy_import.pyx", line 391, in 
> sage.misc.lazy_import.LazyImport.__call__ 
> (build/cythonized/sage/misc/lazy_import.c:4183)
>         return self.get_object()(*args, **kwds)
>       File "sage/misc/lazy_import.pyx", line 217, in 
> sage.misc.lazy_import.LazyImport.get_object 
> (build/cythonized/sage/misc/lazy_import.c:2543)
>         return self._get_object()
>       File "sage/misc/lazy_import.pyx", line 256, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2981)
>         raise FeatureNotPresentError(self._feature, reason=f'Importing 
> {self._name} failed: {e}')
>     sage.features.FeatureNotPresentError: pycryptosat is not available.
>     Importing Solver failed: No module named 'pycryptosat'
>     No equivalent system packages for debian are known to Sage.
>     To install pycryptosat using the Sage package manager, you can try to run:
>       !sage -i cryptominisat
>     No equivalent system packages for pip are known to Sage.
> **********************************************************************
> 1 item had failures:
>    1 of   6 in 
> sage.combinat.matrices.dancing_links.dancing_linksWrapper.to_sat_solver
>     [250 tests, 1 failure, 6.72 s]
>
>
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/sat/solvers/cryptominisat.py
> **********************************************************************
> File "src/sage/sat/solvers/cryptominisat.py", line 50, in 
> sage.sat.solvers.cryptominisat.CryptoMiniSat
> Failed example:
>     solver = CryptoMiniSat()                                  # optional - 
> cryptominisat
> Exception raised:
>     Traceback (most recent call last):
>       File "sage/misc/lazy_import.pyx", line 253, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2866)
>         self._object = getattr(__import__(self._module, {}, {}, 
> [self._name]), self._name)
>     ModuleNotFoundError: No module named 'pycryptosat'
>
>     During handling of the above exception, another exception occurred:
>
>     Traceback (most recent call last):
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 694, in _run
>         self.compile_and_execute(example, compiler, test.globs)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 1088, in compile_and_execute
>         exec(compiled, globs)
>       File "<doctest sage.sat.solvers.cryptominisat.CryptoMiniSat[1]>", line 
> 1, in <module>
>         solver = CryptoMiniSat()                                  # optional 
> - cryptominisat
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/sat/solvers/cryptominisat.py",
>  line 69, in __init__
>         self._solver = Solver(verbose=int(verbosity), 
> confl_limit=int(confl_limit), threads=int(threads))
>       File "sage/misc/lazy_import.pyx", line 391, in 
> sage.misc.lazy_import.LazyImport.__call__ 
> (build/cythonized/sage/misc/lazy_import.c:4183)
>         return self.get_object()(*args, **kwds)
>       File "sage/misc/lazy_import.pyx", line 217, in 
> sage.misc.lazy_import.LazyImport.get_object 
> (build/cythonized/sage/misc/lazy_import.c:2543)
>         return self._get_object()
>       File "sage/misc/lazy_import.pyx", line 256, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2981)
>         raise FeatureNotPresentError(self._feature, reason=f'Importing 
> {self._name} failed: {e}')
>     sage.features.FeatureNotPresentError: pycryptosat is not available.
>     Importing Solver failed: No module named 'pycryptosat'
>     No equivalent system packages for debian are known to Sage.
>     To install pycryptosat using the Sage package manager, you can try to run:
>       !sage -i cryptominisat
>     No equivalent system packages for pip are known to Sage.
> **********************************************************************
>
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/sat/solvers/satsolver.pyx
> **********************************************************************
> File "src/sage/sat/solvers/satsolver.pyx", line 131, in 
> sage.sat.solvers.satsolver.SatSolver.read
> Failed example:
>     solver = CryptoMiniSat()                                          # 
> optional - cryptominisat
> Exception raised:
>     Traceback (most recent call last):
>       File "sage/misc/lazy_import.pyx", line 253, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2866)
>         self._object = getattr(__import__(self._module, {}, {}, 
> [self._name]), self._name)
>     ModuleNotFoundError: No module named 'pycryptosat'
>
>     During handling of the above exception, another exception occurred:
>
>     Traceback (most recent call last):
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 694, in _run
>         self.compile_and_execute(example, compiler, test.globs)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 1088, in compile_and_execute
>         exec(compiled, globs)
>       File "<doctest sage.sat.solvers.satsolver.SatSolver.read[9]>", line 1, 
> in <module>
>         solver = CryptoMiniSat()                                          # 
> optional - cryptominisat
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/sat/solvers/cryptominisat.py",
>  line 69, in __init__
>         self._solver = Solver(verbose=int(verbosity), 
> confl_limit=int(confl_limit), threads=int(threads))
>       File "sage/misc/lazy_import.pyx", line 391, in 
> sage.misc.lazy_import.LazyImport.__call__ 
> (build/cythonized/sage/misc/lazy_import.c:4183)
>         return self.get_object()(*args, **kwds)
>       File "sage/misc/lazy_import.pyx", line 217, in 
> sage.misc.lazy_import.LazyImport.get_object 
> (build/cythonized/sage/misc/lazy_import.c:2543)
>         return self._get_object()
>       File "sage/misc/lazy_import.pyx", line 256, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2981)
>         raise FeatureNotPresentError(self._feature, reason=f'Importing 
> {self._name} failed: {e}')
>     sage.features.FeatureNotPresentError: pycryptosat is not available.
>     Importing Solver failed: No module named 'pycryptosat'
>     No equivalent system packages for debian are known to Sage.
>     To install pycryptosat using the Sage package manager, you can try to run:
>       !sage -i cryptominisat
>     No equivalent system packages for pip are known to Sage.
> **********************************************************************
>
>
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/rings/polynomial/multi_polynomial_sequence.py
> **********************************************************************
> File "src/sage/rings/polynomial/multi_polynomial_sequence.py", line 1425, in 
> sage.rings.polynomial.multi_polynomial_sequence.PolynomialSequence_gf2.solve
> Failed example:
>     sol = S.solve(algorithm='sat') # optional - cryptominisat
> Exception raised:
>     Traceback (most recent call last):
>       File "sage/misc/lazy_import.pyx", line 253, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2866)
>         self._object = getattr(__import__(self._module, {}, {}, 
> [self._name]), self._name)
>     ModuleNotFoundError: No module named 'pycryptosat'
>
>     During handling of the above exception, another exception occurred:
>
>     Traceback (most recent call last):
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 694, in _run
>         self.compile_and_execute(example, compiler, test.globs)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/doctest/forker.py",
>  line 1088, in compile_and_execute
>         exec(compiled, globs)
>       File "<doctest 
> sage.rings.polynomial.multi_polynomial_sequence.PolynomialSequence_gf2.solve[10]>",
>  line 1, in <module>
>         sol = S.solve(algorithm='sat') # optional - cryptominisat
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/rings/polynomial/multi_polynomial_sequence.py",
>  line 1490, in solve
>         solutions = solve_sat(S, n=n, **kwds)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/sat/boolean_polynomials.py",
>  line 252, in solve
>         solver = solver(**solver_kwds)
>       File 
> "/home/slabbe/GitBox/sage/local/var/lib/sage/venv-python3.8/lib/python3.8/site-packages/sage/sat/solvers/cryptominisat.py",
>  line 69, in __init__
>         self._solver = Solver(verbose=int(verbosity), 
> confl_limit=int(confl_limit), threads=int(threads))
>       File "sage/misc/lazy_import.pyx", line 391, in 
> sage.misc.lazy_import.LazyImport.__call__ 
> (build/cythonized/sage/misc/lazy_import.c:4183)
>         return self.get_object()(*args, **kwds)
>       File "sage/misc/lazy_import.pyx", line 217, in 
> sage.misc.lazy_import.LazyImport.get_object 
> (build/cythonized/sage/misc/lazy_import.c:2543)
>         return self._get_object()
>       File "sage/misc/lazy_import.pyx", line 256, in 
> sage.misc.lazy_import.LazyImport._get_object 
> (build/cythonized/sage/misc/lazy_import.c:2981)
>         raise FeatureNotPresentError(self._feature, reason=f'Importing 
> {self._name} failed: {e}')
>     sage.features.FeatureNotPresentError: pycryptosat is not available.
>     Importing Solver failed: No module named 'pycryptosat'
>     No equivalent system packages for debian are known to Sage.
>     To install pycryptosat using the Sage package manager, you can try to run:
>       !sage -i cryptominisat
>     No equivalent system packages for pip are known to Sage.
> **********************************************************************
> 1 item had failures:
>    1 of  23 in 
> sage.rings.polynomial.multi_polynomial_sequence.PolynomialSequence_gf2.solve
>     [257 tests, 1 failure, 14.82 s]
>
>
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/interfaces/expect.py
> **********************************************************************
> File "src/sage/interfaces/expect.py", line 915, in 
> sage.interfaces.expect.Expect._eval_line
> Failed example:
>     singular.interrupt()
> Expected:
>     True
> Got:
>     False
> **********************************************************************
> File "src/sage/interfaces/expect.py", line 921, 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
>     [102 tests, 2 failures, 19.58 s]
>
>
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> 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.?
>     [338 tests, 1 failure, 2.48 s]
>
>
>
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/graphs/generic_graph.py
> **********************************************************************
> File "src/sage/graphs/generic_graph.py", line 9037, 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 9665, 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 1103 in sage.graphs.generic_graph.GenericGraph.?
>    1 of  29 in sage.graphs.generic_graph.GenericGraph.nowhere_zero_flow
>     [3694 tests, 2 failures, 74.22 s]
>
>
>
> sage -t --long --random-seed=277349812120896257585806851727004727044 
> src/sage/graphs/graph.py
> **********************************************************************
> File "src/sage/graphs/graph.py", line 4270, 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 4677, 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 5892, 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
>     [1216 tests, 3 failures, 43.39 s]
>
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