[TestCase(arg: "(+ )", TestName = "space is hard separator")] // closing bracket is missing, no entry left
        public void ScanNewFailure(string content)
        {
            var input = new TextInputRange {
                File = new TextFile {
                    Content  = content,
                    Filename = ""
                }
            };

            var result = OperatorScanner.Scan(input);

            Assert.IsNull(result);
        }
        public void ScanNewSuccess(string content, string id)
        {
            var input = new TextInputRange {
                File = new TextFile {
                    Content  = content,
                    Filename = ""
                }
            };

            var result = OperatorScanner.Scan(input);

            Assert.IsNotNull(result);
            Assert.AreEqual(id, result.Content);
        }