public void Initialize() { _directory = Substitute.For<IDirectory>(); _file = Substitute.For<IFile>(); _path = Substitute.For<IPath>(); _path.SetPathDefaultBehavior(); _tagHelper = Substitute.For<ITagHelper>(); _streamFactory = Substitute.For<IStreamFactory>(); _fileStream = Substitute.For<IFileStream>(); _streamFactory.CreateFileStream(Arg.Any<string>(), Arg.Any<FileMode>(), Arg.Any<FileAccess>(), Arg.Any<FileShare>()).Returns(_fileStream); _geolocHelper = Substitute.For<IGeolocationHelper>(); _target = new FileSystemHelperTester(_directory, _file, _path, _tagHelper, _streamFactory, _geolocHelper); }