public void DeleteVideoShouldDeleteVideoFromDatabase()
{
var options = new DbContextOptionsBuilder <ApplicationDbContext>().UseInMemoryDatabase("Database_For_DeletingVideos").Options;
var dbContext = new ApplicationDbContext(options);
var service = new VideoService(dbContext);
dbContext.Videos.Add(new Video());
dbContext.Videos.Add(new Video());
dbContext.Videos.Add(new Video());
dbContext.SaveChanges();
var video = dbContext.Videos.First();
service.DeleteVideo(video);
Assert.Equal(2, dbContext.Videos.Count());
}