def test_unconstructed_singleton(self):
a = Objective()
self.assertEqual(a._constructed, False)
self.assertEqual(len(a), 0)
try:
a()
self.fail("Component is unconstructed")
except ValueError:
pass
try:
a.expr
self.fail("Component is unconstructed")
except ValueError:
pass
try:
a.sense
self.fail("Component is unconstructed")
except ValueError:
pass
a.construct()
a.set_sense(minimize)
self.assertEqual(len(a), 1)
self.assertEqual(a(), None)
self.assertEqual(a.expr, None)
self.assertEqual(a.sense, minimize)
a.sense = maximize
self.assertEqual(len(a), 1)
self.assertEqual(a(), None)
self.assertEqual(a.expr, None)
self.assertEqual(a.sense, maximize)
def test_empty_singleton(self):
a = Objective()
a.construct()
#
# Even though we construct a SimpleObjective,
# if it is not initialized that means it is "empty"
# and we should encounter errors when trying to access the
# _ObjectiveData interface methods until we assign
# something to the objective.
#
self.assertEqual(a._constructed, True)
self.assertEqual(len(a), 0)
try:
a()
self.fail("Component is empty")
except ValueError:
pass
try:
a.expr
self.fail("Component is empty")
except ValueError:
pass
try:
a.sense
self.fail("Component is empty")
except ValueError:
pass
x = Var(initialize=1.0)
x.construct()
a.set_value(x + 1)
self.assertEqual(len(a), 1)
self.assertEqual(a(), 2)
self.assertEqual(a.expr(), 2)
self.assertEqual(a.sense, minimize)
