feat: добавил ограничение записи на лекции

backend/UniVerse.Api.Tests/Lectures/LectureServiceTests.cs

@@ -4,6 +4,7 @@ using UniVerse.Application.DTOs.Lectures;
 using UniVerse.Application.DTOs.Notifications;
 using UniVerse.Application.Interfaces;
 using UniVerse.Domain.Entities;
+using UniVerse.Domain.Exceptions;
 using UniVerse.Infrastructure.Data;
 using UniVerse.Infrastructure.Services;
 using Xunit;
@@ -92,6 +93,79 @@ public class LectureServiceTests
             Arg.Any<CancellationToken>());
     }
 
+    [Theory]
+    [InlineData(1, 3)]
+    [InlineData(2, 3)]
+    [InlineData(3, 5)]
+    [InlineData(4, 7)]
+    [InlineData(5, 7)]
+    public async Task EnrollAsync_ThrowsWhenActiveEnrollmentLimitReached(int level, int activeEnrollments)
+    {
+        await using var db = CreateDbContext();
+        var gamification = Substitute.For<IGamificationService>();
+        gamification.CalculateLevelAsync(Arg.Any<int>()).Returns(level);
+        var service = new LectureService(db, gamification, Substitute.For<INotificationScheduler>());
+        var startsAt = DateTime.UtcNow.AddDays(1);
+
+        db.Users.Add(new User { Id = 1, Email = "student@test.local" });
+        db.Courses.Add(new Course { Id = 1, Name = "Course" });
+        db.Lectures.Add(Lecture(100, startsAt.AddDays(100)));
+        for (var i = 1; i <= activeEnrollments; i++)
+        {
+            db.Lectures.Add(Lecture(i, startsAt.AddDays(i)));
+            db.LectureEnrollments.Add(new LectureEnrollment { LectureId = i, UserId = 1 });
+        }
+        await db.SaveChangesAsync();
+
+        await Assert.ThrowsAsync<ConflictException>(() => service.EnrollAsync(100, 1));
+    }
+
+    [Fact]
+    public async Task EnrollAsync_ThrowsWhenPastUnattendedEnrollmentsReachLimit()
+    {
+        await using var db = CreateDbContext();
+        var gamification = Substitute.For<IGamificationService>();
+        gamification.CalculateLevelAsync(Arg.Any<int>()).Returns(1);
+        var service = new LectureService(db, gamification, Substitute.For<INotificationScheduler>());
+        var now = DateTime.UtcNow;
+
+        db.Users.Add(new User { Id = 1, Email = "student@test.local" });
+        db.Courses.Add(new Course { Id = 1, Name = "Course" });
+        db.Lectures.Add(Lecture(100, now.AddDays(1)));
+        for (var i = 1; i <= 3; i++)
+        {
+            db.Lectures.Add(Lecture(i, now.AddDays(-i)));
+            db.LectureEnrollments.Add(new LectureEnrollment { LectureId = i, UserId = 1 });
+        }
+        await db.SaveChangesAsync();
+
+        await Assert.ThrowsAsync<ConflictException>(() => service.EnrollAsync(100, 1));
+    }
+
+    [Fact]
+    public async Task EnrollAsync_DoesNotCountAttendedEnrollmentsTowardLimit()
+    {
+        await using var db = CreateDbContext();
+        var gamification = Substitute.For<IGamificationService>();
+        gamification.CalculateLevelAsync(Arg.Any<int>()).Returns(1);
+        var service = new LectureService(db, gamification, Substitute.For<INotificationScheduler>());
+        var now = DateTime.UtcNow;
+
+        db.Users.Add(new User { Id = 1, Email = "student@test.local" });
+        db.Courses.Add(new Course { Id = 1, Name = "Course" });
+        db.Lectures.Add(Lecture(100, now.AddDays(1)));
+        for (var i = 1; i <= 3; i++)
+        {
+            db.Lectures.Add(Lecture(i, now.AddDays(-i)));
+            db.LectureEnrollments.Add(new LectureEnrollment { LectureId = i, UserId = 1, Attended = true });
+        }
+        await db.SaveChangesAsync();
+
+        await service.EnrollAsync(100, 1);
+
+        Assert.True(await db.LectureEnrollments.AnyAsync(e => e.LectureId == 100 && e.UserId == 1));
+    }
+
     [Fact]
     public async Task UnenrollAsync_CancelsLectureReminders()
     {