def test_set_possible_value(self):
c = Cell(9, 0, 0, poss_vals=frozenset({1}))
c2 = c.set_possible_value(2)
self.assertEqual({1}, c.possible_vals())
self.assertEqual({1, 2}, c2.possible_vals())
# Out of range checks
with self.assertRaises(ValueError):
c.set_possible_value(0)
with self.assertRaises(ValueError):
c.set_possible_value(-1)
with self.assertRaises(ValueError):
c.set_possible_value(10)
# Make sure setting a possible value on a set value doesn't change the value.
c = Cell(9, 0, 0, 4)
c2 = c.set_possible_value(5)
self.assertFalse(c2.has_possible_val(5))
self.assertEqual(-1, c2.possible_count())
self.assertEqual(4, c2.value())
def test_modify_initial_cell(self):
c = Cell(9, 0, 0, 4, is_initial=True)
with self.assertRaises(ValueError):
c.set_possible_value(3)
with self.assertRaises(ValueError):
c.set_value(5)
with self.assertRaises(ValueError):
c.clear_value(6)
with self.assertRaises(ValueError):
c.clear_possible_value(2)