public async Task AddToHistory()
        {
            var options = new DbContextOptionsBuilder <MoviesContext>()
                          .UseInMemoryDatabase(databaseName: "MRAddToHistory")
                          .Options;

            addHistories(options);
            using (var context = new MoviesContext(options))
            {
                SQLRepository controller = new SQLRepository(context);
                string        email      = "*****@*****.**";
                int           movieId    = 20;

                await controller.AddToHistory(email, movieId);

                List <History> fullHistory = controller.GetFullHistory("*****@*****.**");

                Assert.Equal(4, fullHistory.Count);
            }
        }