public void Archive_File() { var folder = "C:\\Test"; var file = "TestArchive.xlsx"; var archiveDirectory = $"{folder}\\ArchiveTest"; Directory.CreateDirectory(folder); var fileStream = File.Create($"{folder}\\{file}"); fileStream.Close(); if (Directory.Exists(archiveDirectory)) { Directory.GetFiles(archiveDirectory, "TestArchive*.xlsx", SearchOption.TopDirectoryOnly).ToList().ForEach(f => File.Delete(f)); } FileUtilities.ArchiveFile($"{folder}\\{file}", archiveDirectory); var files = Directory.GetFiles(archiveDirectory, "TestArchive_*.xlsx", SearchOption.TopDirectoryOnly); Assert.AreEqual(1, files.Count()); }