public void WordRewriter_Will_Detect_And_Rewrite_Functions()
{
MathExpressionTokenizer tokenizer = new MathExpressionTokenizer();
var tokens = tokenizer.Tokenize("sqrt(1)");
WordRewriter rewriter = new WordRewriter();
var result = rewriter.Rewrite(tokens);
Assert.AreEqual(TokenType.Function, result[0].Type);
Assert.AreEqual("sqrt", result[0].Value);
}