public virtual void TestEquals()
{
TreeShapedStack <string> t1 = new TreeShapedStack <string>();
t1 = t1.Push("foo");
t1 = t1.Push("bar");
t1 = t1.Push("bar");
t1 = t1.Push("diet");
t1 = t1.Push("coke");
TreeShapedStack <string> t2 = new TreeShapedStack <string>();
t2 = t2.Push("foo");
t2 = t2.Push("bar");
t2 = t2.Push("bar");
t2 = t2.Push("diet");
t2 = t2.Push("coke");
TreeShapedStack <string> t3 = t2.Pop().Push("pepsi");
NUnit.Framework.Assert.AreEqual(t1, t2);
NUnit.Framework.Assert.IsFalse(t1.Pop().Equals(t2));
NUnit.Framework.Assert.IsFalse(t2.Pop().Equals(t1));
NUnit.Framework.Assert.IsFalse(t2.Equals(t3));
}
