public void InitTests()
{
fileName = Path.GetTempFileName();
File.WriteAllText(fileName, SOURCE);
tokenizer = new RegExpTokenizer();
tokenizer.SetTransitionFunction(new TableDrivenTransitionFunction());
Array.ForEach(lexemes, (s) => tokenizer.UseTerminal(RegExp.Literal(s)));
tokenizer.BuildTransitions();
lexer = new Lexer(tokenizer);
fileStream = File.OpenRead(fileName);
lexer.SetDataSource(fileStream);
}