public void TestHasNext()
{
List <Token> tokens = new List <Token>();
tokens.Add(new Token(TokenType.DollarIdentifier, "a", 5, 2));
tokens.Add(new Token(TokenType.Word, "a", 5, 3));
tokens.Add(new Token(TokenType.AtIdentifier, "@b", 12, 0));
tokens.Add(new Token(TokenType.Word, "c", 14, 42));
TokenIterator tokenIterator = new TokenIterator(tokens);
Assert.IsTrue(tokenIterator.HasNextType(TokenType.DollarIdentifier));
Assert.IsTrue(tokenIterator.HasNextType(TokenType.DollarIdentifier, TokenType.Pipe));
Assert.IsTrue(tokenIterator.HasNextType(TokenType.Period, TokenType.DollarIdentifier, TokenType.Pipe));
Assert.IsFalse(tokenIterator.HasNextType(TokenType.Number));
tokenIterator.Next();
tokenIterator.Next();
tokenIterator.Next();
tokenIterator.Next();
Assert.IsFalse(tokenIterator.HasNextType(TokenType.Word));
}