public void FileDir_PrepareDate()
        {
            IFileService service      = new StubFileService();
            ReportViewer reportViewer = new ReportViewer(service); // Dependency Injection

            Assert.IsTrue(reportViewer.PrepareData());
        }
        public void BlockCount()
        {
            IFileService service      = new StubFileService();
            ReportViewer reportViewer = new ReportViewer(service);

            reportViewer.PrepareData();


            Assert.AreEqual(4, reportViewer.BlockCount);
        }