public void AddExistingSymbolFails()
{
var g = new Grammar();
var subject = new Symbol("SUBJECT");
g.AddSymbol(subject);
Exception ex = Assert.Throws <TinyGrammarException>(() => g.AddSymbol(subject));
Assert.Equal("Symbol already present.", ex.Message);
Assert.Equal(1, g.Symbols.Count);
}
public void AddSymbol()
{
var g = new Grammar();
Assert.Equal(0, g.Symbols.Count);
var subject = new Symbol("SUBJECT");
g.AddSymbol(subject);
Assert.Equal(1, g.Symbols.Count);
}
