GenericBackend._test_solve: Remove again for now; too many failures

src/sage/numerical/backends/generic_backend.pyx

@@ -634,35 +634,6 @@ cdef class GenericBackend:
         """
         raise NotImplementedError()
 
-    ## Any test methods involving calls to 'solve' are set up as class methods,
-    ## which make a fresh instance of the backend.
-    @classmethod
-    def _test_solve(cls, tester=None, **options):
-        """
-        Trivial test for the solve method.
-
-        TEST::
-
-            sage: from sage.numerical.backends.generic_backend import GenericBackend
-            sage: p = GenericBackend()
-            sage: p._test_solve()
-            Traceback (most recent call last):
-            ...
-            NotImplementedError
-        """
-        p = cls()                         # fresh instance of the backend
-        if tester is None:
-            tester = p._tester(**options)
-        # From doctest of GenericBackend.solve:
-        tester.assertIsNone(p.add_linear_constraints(5, 0, None))
-        tester.assertIsNone(p.add_col(range(5), range(5)))
-        tester.assertEqual(p.solve(), 0)
-        tester.assertIsNone(p.objective_coefficient(0,1))
-        from sage.numerical.mip import MIPSolverException
-        #with tester.assertRaisesRegexp(MIPSolverException, "unbounded") as cm:  ## --- too specific
-        with tester.assertRaises(MIPSolverException) as cm:   # unbounded
-            p.solve()
-
     cpdef get_objective_value(self):
         """
         Return the value of the objective function.