public void Can_run_in_background()
        {
            const int ticks = 3;
            var block = new ManualResetEvent(false);

            RegisterMetrics();

            var directory = Path.GetTempPath();
            var samples = Directory.GetFiles(directory, "*.sample");
            foreach (var file in samples)
            {
                File.Delete(file);
            }

            ThreadPool.QueueUserWorkItem(
                s =>
                {
                    var reporter = new SampledFileReporter(directory, new JsonReportFormatter());
                    reporter.Start(1, TimeUnit.Seconds);
                    while (true)
                    {
                        Thread.Sleep(1000);
                        var runs = reporter.Runs;
                        if (runs == ticks)
                        {
                            block.Set();
                            reporter.Stop();
                            reporter.Dispose();
                        }
                    }
                });

            block.WaitOne(TimeSpan.FromSeconds(5));
            samples = Directory.GetFiles(directory, "*.sample");
            Assert.GreaterOrEqual(samples.Length, 3);
        }
        public void Can_stop()
        {
            var block = new ManualResetEvent(false);

            RegisterMetrics();

            ThreadPool.QueueUserWorkItem(
                s =>
                {
                    var reporter = new SampledFileReporter(Path.GetTempPath());
                    reporter.Start(1, TimeUnit.Seconds);
                    reporter.Stopped += delegate { block.Set(); };
                    Thread.Sleep(2000);
                    reporter.Stop();
                });

            block.WaitOne();
        }