public async Task GetDetailsByIdAsync_WithSupplementIdAndPage_ShouldReturnValidServiceModel()
{
// Arrange
FitStoreDbContext database = this.Database;
DatabaseHelper.SeedData(database);
IManufacturerService manufacturerService = new ManufacturerService(database);
// Act
ManufacturerDetailsServiceModel result = await manufacturerService.GetDetailsByIdAsync(firstManufacturerId, page);
// Assert
result.Id.Should().Be(1);
result.Name.Should().Be("Manufacturer 1");
result.Supplements.Count().Should().Be(2);
}