protected override void ConfigureWebHost(IWebHostBuilder builder) { builder.ConfigureServices(services => { // Remove the app's ApplicationDbContext registration. ServiceDescriptor descriptor = services.SingleOrDefault(d => d.ServiceType == typeof(DbContextOptions <ToDoDbContext>)); if (descriptor != null) { services.Remove(descriptor); } // Add ApplicationDbContext using an in-memory database for testing. services.AddDbContext <ToDoDbContext>(options => { options.UseSqlite("Data Source=ToDoTest.db"); }); ServiceProvider sp = services.BuildServiceProvider(); using (IServiceScope scope = sp.CreateScope()) { IServiceProvider scopedServices = scope.ServiceProvider; ToDoDbContext db = scopedServices.GetRequiredService <ToDoDbContext>(); db.Database.EnsureDeleted(); db.Database.Migrate(); db.LoadFixtures(); } }); }