public void OnErrSetsErrorLine()
        {
            SetupSut();
            var tokens = new List <IToken>
            {
                new Token("GOTO", TokenClass.Statement, TokenType.Goto),
                new Token("1000")
            };

            _runEnvironment.CurrentLine = new ProgramLine(20, tokens);
            _sut.Execute();
            Assert.AreEqual(1000, _runEnvironment.OnErrorGotoLineNumber);
        }