public virtual void Unconsume()
{
CharacterReader r = new CharacterReader("one");
NUnit.Framework.Assert.AreEqual('o', r.Consume());
NUnit.Framework.Assert.AreEqual('n', r.Current());
r.Unconsume();
NUnit.Framework.Assert.AreEqual('o', r.Current());
NUnit.Framework.Assert.AreEqual('o', r.Consume());
NUnit.Framework.Assert.AreEqual('n', r.Consume());
NUnit.Framework.Assert.AreEqual('e', r.Consume());
NUnit.Framework.Assert.IsTrue(r.IsEmpty());
r.Unconsume();
NUnit.Framework.Assert.IsFalse(r.IsEmpty());
NUnit.Framework.Assert.AreEqual('e', r.Current());
NUnit.Framework.Assert.AreEqual('e', r.Consume());
NUnit.Framework.Assert.IsTrue(r.IsEmpty());
NUnit.Framework.Assert.AreEqual(CharacterReader.EOF, r.Consume());
r.Unconsume();
NUnit.Framework.Assert.IsTrue(r.IsEmpty());
NUnit.Framework.Assert.AreEqual(CharacterReader.EOF, r.Current());
}