public void CanClearStream() { // Arrange var stream = new VideoStream(); stream.AddVideo(new Video { Id = "001", Name = "One", }); stream.AddVideo(new Video { Id = "002", Name = "Two", }); stream.AddVideo(new Video { Id = "003", Name = "One", }); // Act var video1 = stream.ClearStream(); var video2 = stream.SizeOfStream(); // Assert Assert.True(video1); Assert.Equal(0, video2); }