static T TestParse <T>(string source, ICfgNode expected, TokenListParser <ScriptToken, T> parser) where T : ICfgNode
{
var tokens = ScriptTokenizer.Tokenize(source);
if (!tokens.HasValue)
{
throw new InvalidOperationException(
$"Tokenization failure: {tokens.ErrorMessage} at {tokens.ErrorPosition}");
}
var filtered = ScriptParser.FilterTokens(tokens.Value);
var parsed = parser.TryParse(filtered);
if (!parsed.HasValue)
{
throw new InvalidOperationException($"Parse failure: {parsed}");
}
Assert.Equal(expected, parsed.Value);
return(parsed.Value);
}