public void FileSystem_ArpCommandPath_FileExists_OSX()
        {
            Mock <IOperatingSystem> operatingSystemMock = new Mock <IOperatingSystem>();

            operatingSystemMock.Setup(osm => osm.IsWindows()).Returns(false);
            operatingSystemMock.Setup(osm => osm.IsOsx()).Returns(true);

            var fileSystem = new FileSystem(typeof(FileSystemIntegrationTests), operatingSystemMock.Object);

            fileSystem.ArpCommandPath().Should().Be("/usr/sbin/arp");
        }