public async Task TotalSupplementsCountAsync_WithSubcategoryId_ShouldReturnValidSum()
{
// Arrange
FitStoreDbContext database = this.Database;
DatabaseHelper.SeedData(database);
ISubcategoryService subcategoryService = new SubcategoryService(database);
// Act
int result = await subcategoryService.TotalSupplementsCountAsync(firstSubcategoryId);
// Assert
result.Should().Be(2);
}