def test_is_safe(self):
"""test_is_safe: Test to make sure that is_safe function works
"""
solver = Queen(8)
solver.board_state = [0]
self.assertFalse(solver.is_safe(0, 1))
self.assertFalse(solver.is_safe(1, 0))
self.assertFalse(solver.is_safe(1, 1))
self.assertTrue(solver.is_safe(2, 1))
self.assertTrue(solver.is_safe(1, 2))
