public async Task ReturnFalseWhenBookIsNullReserveBook_Test() { string title = null; var username = "******"; var reserveBookDto = new BaseTitleDto(); var options = TestUtilities.GetOptions(nameof(ReturnFalseWhenBookIsNullReserveBook_Test)); using (var actContext = new LibrarySystemContext(options)) { var user = await actContext.Users.AddAsync(new User { UserName = username }); await actContext.SaveChangesAsync(); reserveBookDto.Title = title; reserveBookDto.UserId = user.Entity.Id; } using (var assertContext = new LibrarySystemContext(options)) { var sut = new BookWebService(assertContext); var bookReserve = await sut.ReserveBookAsync(reserveBookDto); Assert.IsFalse(bookReserve); } }