public void TestSquareToString()
{
Square s = new Square(1, 1);
Assert.AreEqual("1,2,3,4,5,6,7,8,9", s.ToString());
s.RemovePossiblity(5);
Assert.AreEqual("1,2,3,4,6,7,8,9", s.ToString());
s.Value = 4;
Assert.AreEqual("4", s.ToString());
}
