public void TestCompareTo()
{
VisitableStack <int> stack1 = new VisitableStack <int>();
VisitableStack <int> stack2 = new VisitableStack <int>();
VisitableStack <int> stack3 = new VisitableStack <int>();
Assert.AreEqual(stack1.CompareTo(stack2), 0);
Assert.AreEqual(stack1.CompareTo(stack3), 0);
Assert.AreEqual(stack3.CompareTo(stack1), 0);
}
public void TestCompareToOther()
{
VisitableStack <int> stack1 = new VisitableStack <int>();
object o = new object();
Assert.AreEqual(stack1.CompareTo(o), -1);
}
public void TestInvalidCompareTo()
{
VisitableStack <string> s = new VisitableStack <string>();
s.CompareTo(null);
}
