Добавьте файлы проекта.

Data/FakeTicketRepository.cs

@@ -0,0 +1,21 @@
+using Services.Tickets;
+using Services.Tickets.Models;
+
+namespace Data;
+
+internal class FakeTicketRepository : ITicketRepository
+{
+    private readonly List<LotteryTicket> _lotteryTickets = new List<LotteryTicket>();
+    public Task<long> AddNewTicket(LotteryTicket ticket)
+    {
+        var id =(long)Random.Shared.Next(1, 100);
+        ticket.Id = id;
+        _lotteryTickets.Add(ticket);
+        return Task.FromResult(id);
+    }
+
+    public Task<List<LotteryTicket>> GetAllTickets()
+    {
+        return Task.FromResult(_lotteryTickets);
+    }
+}