fix: перенёс уровни в бд и пофиксид их отображение на фронте

backend/UniVerse.Api.Tests/Users/UserServiceTests.cs

@@ -0,0 +1,80 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging.Abstractions;
+using NSubstitute;
+using UniVerse.Application.DTOs.Notifications;
+using UniVerse.Application.Interfaces;
+using UniVerse.Domain.Entities;
+using UniVerse.Infrastructure.Data;
+using UniVerse.Infrastructure.Services;
+using Xunit;
+
+namespace UniVerse.Api.Tests.Users;
+
+public class UserServiceTests
+{
+    [Fact]
+    public async Task GetStatsAsync_ReturnsLevelProgressThresholds()
+    {
+        await using var db = CreateDbContext();
+        SeedLevelThresholds(db);
+        db.Users.Add(new User { Id = 1, Email = "student@test.local", Xp = 120 });
+        await db.SaveChangesAsync();
+        var service = CreateService(db);
+
+        var stats = await service.GetStatsAsync(1);
+
+        Assert.Equal(2, stats.Level);
+        Assert.Equal(100, stats.CurrentLevelXp);
+        Assert.Equal(300, stats.NextLevelXp);
+    }
+
+    [Fact]
+    public async Task GetStatsAsync_ReturnsNullNextLevelAtMaxConfiguredLevel()
+    {
+        await using var db = CreateDbContext();
+        SeedLevelThresholds(db);
+        db.Users.Add(new User { Id = 1, Email = "student@test.local", Xp = 350 });
+        await db.SaveChangesAsync();
+        var service = CreateService(db);
+
+        var stats = await service.GetStatsAsync(1);
+
+        Assert.Equal(3, stats.Level);
+        Assert.Equal(300, stats.CurrentLevelXp);
+        Assert.Null(stats.NextLevelXp);
+    }
+
+    private static AppDbContext CreateDbContext()
+    {
+        var options = new DbContextOptionsBuilder<AppDbContext>()
+            .UseInMemoryDatabase($"UserServiceTests_{Guid.NewGuid()}")
+            .Options;
+        return new AppDbContext(options);
+    }
+
+    private static UserService CreateService(AppDbContext db)
+    {
+        var notifications = Substitute.For<INotificationService>();
+        notifications.CreateUserNotificationAsync(
+                Arg.Any<int>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<string>(),
+                Arg.Any<CancellationToken>())
+            .Returns(callInfo => new UserNotificationDto(1, callInfo.ArgAt<string>(1), callInfo.ArgAt<string>(2), callInfo.ArgAt<string>(3), false, DateTime.UtcNow));
+        notifications.SendAsync(Arg.Any<NotificationMessage>(), Arg.Any<CancellationToken>())
+            .Returns(Task.CompletedTask);
+
+        var gamification = new GamificationService(db, notifications, NullLogger<GamificationService>.Instance);
+        return new UserService(db, gamification);
+    }
+
+    private static void SeedLevelThresholds(AppDbContext db)
+    {
+        db.LevelThresholds.AddRange(
+            new LevelThreshold { Level = 1, RequiredXp = 0 },
+            new LevelThreshold { Level = 2, RequiredXp = 100 },
+            new LevelThreshold { Level = 3, RequiredXp = 300 });
+        db.SaveChanges();
+    }
+}