public void CreateCntSubtractorByDefault()
        {
            var factory    = new BackgroundSubtractorFactory(CNTSubtractorSettings.Default);
            var subtractor = factory.Create(SubtractionSettings.Default.Algorithm);

            Assert.IsType <CNTSubtractor>(subtractor);
        }
        public void ThrowExceptionWhenUnknownAlgorithmIsRequested()
        {
            var factory = new BackgroundSubtractorFactory(CNTSubtractorSettings.Default);

            Assert.Throws <ArgumentException>(() => factory.Create("Unknown algo"));
        }