public async Task TotalSupplementsCountAsync_WithManufacturerId_ShouldReturnValidSum() { // Arrange FitStoreDbContext database = this.Database; DatabaseHelper.SeedData(database); IManufacturerService manufacturerService = new ManufacturerService(database); // Act int result = await manufacturerService.TotalSupplementsCountAsync(firstManufacturerId); // Assert result.Should().Be(2); }