Method works when dependent Method never called?

public class MockPieRepository : IPieRepository
{
    private readonly ICategoryRepository _categoryRepository = new MockCategoryRepository();

    public IEnumerable<Pie> AllPies =>
        new List<Pie>
        {
            new Pie {PieId = 1, etc},
            new Pie {PieId = 2, etc}
        };

   public IEnumerable<Pie> PiesOfTheWeek
    {
     get
        {
            return AllPies.Where(p => p.IsPieOfTheWeek);
        }
    }
}