public void GetParenthesisAsSeparators()
{
Lexer lexer = new Lexer("()");
Token token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual(TokenType.Separator, token.Type);
Assert.AreEqual("(", token.Value);
token = lexer.NextToken();
Assert.IsNotNull(token);
Assert.AreEqual(TokenType.Separator, token.Type);
Assert.AreEqual(")", token.Value);
Assert.IsNull(lexer.NextToken());
}