public virtual void TestHole()
{
TokenStream ts = new CannedTokenStream(new Token[] { Token("abc", 1, 1), Token("def", 2, 1) });
Automaton actual = (new TokenStreamToAutomaton()).ToAutomaton(ts);
Automaton expected = Join(S2a("abc"), SEP_A, HOLE_A, SEP_A, S2a("def"));
//toDot(actual);
Assert.IsTrue(BasicOperations.SameLanguage(expected, actual));
}