def test_add_differing_interface_type_raises(self):
from optlang import glpk_interface as glpk
x, y = glpk.Variable('x'), glpk.Variable('y')
constraint = glpk.Constraint(x + y)
objective = glpk.Objective(1. * x)
self.assertRaises(TypeError, self.model.add, x)
self.assertRaises(TypeError, self.model.add, constraint)
self.assertRaises(TypeError, self.model.add, objective)
def test_clone_constraint_glpk_to_cplex(self):
x1 = glpk.Variable('x1', lb=0)
x2 = glpk.Variable('x2', lb=0)
x3 = glpk.Variable('x3', lb=0)
c1 = glpk.Constraint(x1 + x2 + x3, ub=100)
cplex_c1 = cplex.Constraint.clone(c1)
print(cplex_c1)
self.assertIs(cplex_c1.__class__, cplex.Constraint)
for variable in cplex_c1.variables:
self.assertIs(variable.__class__, cplex.Variable)