it('Match the character that is at the current index', function () {
let l = new LL1Lexer('abcd');
l.match('a');
expect(l.index).toBe(1);
expect(l.char).toBe('b');
});
it('No match throws an exception', function () {
let l = new LL1Lexer('abcd');
expect(function () {
l.match('c');
}).toThrow(new Exception('Expecting "c"; found "a"'));
});
it('Create a token', function () {
let l = new LL1Lexer('abcd'),
t = l.createToken(LL1Lexer.EOF_TYPE, '');
expect(t.toString()).toEqual('<"", "<EOF>">');
});
expect(function () {
l.match('c');
}).toThrow(new Exception('Expecting "c"; found "a"'));