public void Can_run_with_known_counters()
        {
            RegisterMetrics();

            using (var reporter = new FileReporter(_filename))
            {
                reporter.Run();
            }
        }
        public void File_is_created_with_json_content()
        {
            RegisterMetrics();

            using (var reporter = new FileReporter(_filename, new JsonReportFormatter(_metrics)))
            {
                reporter.Run();
                Assert.IsTrue(File.Exists(_filename));
            }

            var contents = File.ReadAllText(_filename);
            Console.WriteLine(contents);
        }