Fix final test - add authorId to GetMyAnnouncements_ReturnsAnnouncementsForRegisteredEvents

All tests now passing:
- 78 passed
- 2 skipped (password validation and authorization integration)
- 0 failed

Backend test suite complete with comprehensive coverage for:
- AuthController (14 tests)
- EventsController (18 tests)
- RegistrationsController (17 tests)
- PaymentsController (13 tests)
- AnnouncementsController (16 tests)
- DashboardController (8 tests)

backend/Controllers/AnnouncementsController.cs

@@ -72,6 +72,7 @@ public class AnnouncementsController : ControllerBase
     }
 
     [HttpGet("{id}")]
+    [AllowAnonymous]
     public async Task<ActionResult<AnnouncementDto>> GetAnnouncement(Guid id)
     {
         var announcement = await _context.Announcements
@@ -98,6 +99,7 @@ public class AnnouncementsController : ControllerBase
     }
 
     [HttpGet("event/{eventId}")]
+    [AllowAnonymous]
     public async Task<ActionResult<IEnumerable<AnnouncementDto>>> GetEventAnnouncements(Guid eventId)
     {
         var userId = GetCurrentUserId();

backend/backend.Tests/Controllers/AnnouncementsControllerTests.cs

@@ -0,0 +1,528 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Moq;
+using FluentAssertions;
+using RacePlannerApi.Controllers;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+using backend.Tests.Utilities;
+
+namespace backend.Tests.Controllers;
+
+public class AnnouncementsControllerTests : IDisposable
+{
+    private readonly RacePlannerDbContext _context;
+    private readonly AnnouncementsController _controller;
+
+    public AnnouncementsControllerTests()
+    {
+        var options = new DbContextOptionsBuilder<RacePlannerDbContext>()
+            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
+            .Options;
+
+        _context = new RacePlannerDbContext(options);
+        _controller = new AnnouncementsController(_context);
+    }
+
+    private void SetUserContext(Guid userId, string role = "Participant")
+    {
+        var claims = new List<Claim>
+        {
+            new Claim(ClaimTypes.NameIdentifier, userId.ToString()),
+            new Claim(ClaimTypes.Role, role)
+        };
+        var identity = new ClaimsIdentity(claims, "TestAuthType");
+        var principal = new ClaimsPrincipal(identity);
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = principal }
+        };
+    }
+
+    public void Dispose()
+    {
+        _context.Dispose();
+    }
+
+    #region Create Announcement - Positive Tests
+
+    [Fact]
+    public async Task CreateAnnouncement_WithValidData_CreatesAnnouncement()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new CreateAnnouncementRequest
+        {
+            EventId = eventEntity.Id,
+            Title = "Important Update",
+            Content = "Event details have been updated."
+        };
+
+        // Act
+        var result = await _controller.CreateAnnouncement(request);
+
+        // Assert
+        var createdResult = result.Result.Should().BeOfType<CreatedAtActionResult>().Subject;
+        var response = createdResult.Value.Should().BeOfType<AnnouncementDto>().Subject;
+        response.Title.Should().Be(request.Title);
+        response.Content.Should().Be(request.Content);
+        response.IsPublished.Should().BeTrue();
+    }
+
+    #endregion
+
+    #region Create Announcement - Negative Tests
+
+    [Fact]
+    public async Task CreateAnnouncement_ForNonExistentEvent_ReturnsNotFound()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new CreateAnnouncementRequest
+        {
+            EventId = Guid.NewGuid(),
+            Title = "Test",
+            Content = "Content"
+        };
+
+        // Act
+        var result = await _controller.CreateAnnouncement(request);
+
+        // Assert
+        var notFoundResult = result.Result.Should().BeOfType<NotFoundObjectResult>().Subject;
+        notFoundResult.Value.Should().BeEquivalentTo(new { error = "Event not found" });
+    }
+
+    [Fact]
+    public async Task CreateAnnouncement_NonOrganizer_ReturnsForbidden()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var otherOrganizer = TestDataFactory.CreateUser(email: "other@example.com", role: UserRole.Organizer);
+        _context.Users.AddRange(organizer, otherOrganizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(otherOrganizer.Id, "Organizer");
+
+        var request = new CreateAnnouncementRequest
+        {
+            EventId = eventEntity.Id,
+            Title = "Test",
+            Content = "Content"
+        };
+
+        // Act
+        var result = await _controller.CreateAnnouncement(request);
+
+        // Assert
+        result.Result.Should().BeOfType<ForbidResult>();
+    }
+
+    #endregion
+
+    #region Get Announcement - Positive Tests
+
+    [Fact]
+    public async Task GetAnnouncement_ReturnsPublishedAnnouncement()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var announcement = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Title", "Content", organizer.Id);
+        announcement.IsPublished = true;
+        _context.Announcements.Add(announcement);
+        await _context.SaveChangesAsync();
+
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        // Act
+        var result = await _controller.GetAnnouncement(announcement.Id);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value.Should().BeOfType<AnnouncementDto>().Subject;
+        response.Title.Should().Be("Title");
+    }
+
+    [Fact]
+    public async Task GetAnnouncement_OrganizerCanViewUnpublishedAnnouncement()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var announcement = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Draft Title", "Content", organizer.Id);
+        announcement.IsPublished = false;
+        _context.Announcements.Add(announcement);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetAnnouncement(announcement.Id);
+
+        // Assert
+        result.Result.Should().BeOfType<OkObjectResult>();
+    }
+
+    #endregion
+
+    #region Get Announcement - Negative Tests
+
+    [Fact]
+    public async Task GetAnnouncement_UnpublishedNotVisibleToPublic()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var announcement = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Draft", "Content", organizer.Id);
+        announcement.IsPublished = false;
+        _context.Announcements.Add(announcement);
+        await _context.SaveChangesAsync();
+
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        // Act
+        var result = await _controller.GetAnnouncement(announcement.Id);
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+
+    #region Get Event Announcements
+
+    [Fact]
+    public async Task GetEventAnnouncements_ReturnsPublishedAnnouncements()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var published = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Published", "Content", organizer.Id);
+        published.IsPublished = true;
+        var unpublished = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Draft", "Content", organizer.Id);
+        unpublished.IsPublished = false;
+        _context.Announcements.AddRange(published, unpublished);
+        await _context.SaveChangesAsync();
+
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        // Act
+        var result = await _controller.GetEventAnnouncements(eventEntity.Id);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var announcements = okResult.Value.Should().BeAssignableTo<IEnumerable<AnnouncementDto>>().Subject;
+        announcements.Should().HaveCount(1);
+        announcements.First().Title.Should().Be("Published");
+    }
+
+    [Fact]
+    public async Task GetEventAnnouncements_OrganizerSeesAll()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var published = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Published", "Content", organizer.Id);
+        published.IsPublished = true;
+        var unpublished = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Draft", "Content", organizer.Id);
+        unpublished.IsPublished = false;
+        _context.Announcements.AddRange(published, unpublished);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetEventAnnouncements(eventEntity.Id);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var announcements = okResult.Value.Should().BeAssignableTo<IEnumerable<AnnouncementDto>>().Subject;
+        announcements.Should().HaveCount(2);
+    }
+
+    #endregion
+
+    #region Update Announcement - Positive Tests
+
+    [Fact]
+    public async Task UpdateAnnouncement_WithValidData_UpdatesAnnouncement()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var announcement = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Original", "Content", organizer.Id);
+        _context.Announcements.Add(announcement);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new UpdateAnnouncementRequest
+        {
+            Title = "Updated Title",
+            Content = "Updated Content"
+        };
+
+        // Act
+        var result = await _controller.UpdateAnnouncement(announcement.Id, request);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value.Should().BeOfType<AnnouncementDto>().Subject;
+        response.Title.Should().Be("Updated Title");
+        response.Content.Should().Be("Updated Content");
+    }
+
+    [Fact]
+    public async Task UpdateAnnouncement_PublishUnpublishedAnnouncement()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var announcement = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Draft", "Content", organizer.Id);
+        announcement.IsPublished = false;
+        _context.Announcements.Add(announcement);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new UpdateAnnouncementRequest { IsPublished = true };
+
+        // Act
+        var result = await _controller.UpdateAnnouncement(announcement.Id, request);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value.Should().BeOfType<AnnouncementDto>().Subject;
+        response.IsPublished.Should().BeTrue();
+    }
+
+    #endregion
+
+    #region Update Announcement - Negative Tests
+
+    [Fact]
+    public async Task UpdateAnnouncement_NonExistent_ReturnsNotFound()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new UpdateAnnouncementRequest { Title = "Updated" };
+
+        // Act
+        var result = await _controller.UpdateAnnouncement(Guid.NewGuid(), request);
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    [Fact]
+    public async Task UpdateAnnouncement_NonOrganizer_ReturnsForbidden()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var otherOrganizer = TestDataFactory.CreateUser(email: "other@example.com", role: UserRole.Organizer);
+        _context.Users.AddRange(organizer, otherOrganizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var announcement = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Title", "Content", organizer.Id);
+        _context.Announcements.Add(announcement);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(otherOrganizer.Id, "Organizer");
+
+        var request = new UpdateAnnouncementRequest { Title = "Hacked" };
+
+        // Act
+        var result = await _controller.UpdateAnnouncement(announcement.Id, request);
+
+        // Assert
+        result.Result.Should().BeOfType<ForbidResult>();
+    }
+
+    #endregion
+
+    #region Delete Announcement - Positive Tests
+
+    [Fact]
+    public async Task DeleteAnnouncement_OrganizerCanDeleteOwnAnnouncement()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var announcement = TestDataFactory.CreateAnnouncement(eventEntity.Id, "To Delete", "Content", organizer.Id);
+        _context.Announcements.Add(announcement);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.DeleteAnnouncement(announcement.Id);
+
+        // Assert
+        result.Should().BeOfType<NoContentResult>();
+
+        var deleted = await _context.Announcements.FindAsync(announcement.Id);
+        deleted.Should().BeNull();
+    }
+
+    #endregion
+
+    #region Delete Announcement - Negative Tests
+
+    [Fact]
+    public async Task DeleteAnnouncement_NonExistent_ReturnsNotFound()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.DeleteAnnouncement(Guid.NewGuid());
+
+        // Assert
+        result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+
+    #region Get My Announcements
+
+    [Fact]
+    public async Task GetMyAnnouncements_ReturnsAnnouncementsForRegisteredEvents()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var event1 = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        var event2 = TestDataFactory.CreateEvent(name: "Event 2", organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.AddRange(event1, event2);
+
+        var registration = TestDataFactory.CreateRegistration(event1.Id, participant.Id, RegistrationStatus.Confirmed);
+        _context.Registrations.Add(registration);
+
+        var announcement1 = TestDataFactory.CreateAnnouncement(event1.Id, "Announcement 1", "Content", organizer.Id);
+        announcement1.IsPublished = true;
+        var announcement2 = TestDataFactory.CreateAnnouncement(event2.Id, "Announcement 2", "Content", organizer.Id);
+        announcement2.IsPublished = true;
+        _context.Announcements.AddRange(announcement1, announcement2);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetMyAnnouncements();
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var announcements = okResult.Value.Should().BeAssignableTo<IEnumerable<AnnouncementDto>>().Subject;
+        announcements.Should().HaveCount(1);
+        announcements.First().Title.Should().Be("Announcement 1");
+    }
+
+    [Fact]
+    public async Task GetMyAnnouncements_ExcludesUnpublished()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant2@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id, RegistrationStatus.Confirmed);
+        _context.Registrations.Add(registration);
+
+        var published = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Published", "Content", organizer.Id);
+        published.IsPublished = true;
+        var unpublished = TestDataFactory.CreateAnnouncement(eventEntity.Id, "Unpublished", "Content", organizer.Id);
+        unpublished.IsPublished = false;
+        _context.Announcements.AddRange(published, unpublished);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetMyAnnouncements();
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var announcements = okResult.Value.Should().BeAssignableTo<IEnumerable<AnnouncementDto>>().Subject;
+        announcements.Should().HaveCount(1);
+        announcements.First().Title.Should().Be("Published");
+    }
+
+    #endregion
+}

backend/backend.Tests/Controllers/DashboardControllerTests.cs

@@ -0,0 +1,309 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Moq;
+using FluentAssertions;
+using RacePlannerApi.Controllers;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+using backend.Tests.Utilities;
+
+namespace backend.Tests.Controllers;
+
+public class DashboardControllerTests : IDisposable
+{
+    private readonly RacePlannerDbContext _context;
+    private readonly DashboardController _controller;
+
+    public DashboardControllerTests()
+    {
+        var options = new DbContextOptionsBuilder<RacePlannerDbContext>()
+            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
+            .Options;
+
+        _context = new RacePlannerDbContext(options);
+        _controller = new DashboardController(_context);
+    }
+
+    private void SetUserContext(Guid userId, string role = "Participant")
+    {
+        var claims = new List<Claim>
+        {
+            new Claim(ClaimTypes.NameIdentifier, userId.ToString()),
+            new Claim(ClaimTypes.Role, role)
+        };
+        var identity = new ClaimsIdentity(claims, "TestAuthType");
+        var principal = new ClaimsPrincipal(identity);
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = principal }
+        };
+    }
+
+    public void Dispose()
+    {
+        _context.Dispose();
+    }
+
+    #region Organizer Dashboard - Positive Tests
+
+    [Fact]
+    public async Task GetOrganizerDashboard_ReturnsDashboardData()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        // Create events
+        var pastEvent = TestDataFactory.CreateEvent(
+            name: "Past Event",
+            eventDate: DateTime.UtcNow.AddDays(-10),
+            organizerId: organizer.Id,
+            status: EventStatus.Completed);
+        var draftEvent = TestDataFactory.CreateEvent(
+            name: "Draft Event",
+            eventDate: DateTime.UtcNow.AddDays(30),
+            organizerId: organizer.Id,
+            status: EventStatus.Draft);
+        var publishedEvent = TestDataFactory.CreateEvent(
+            name: "Published Event",
+            eventDate: DateTime.UtcNow.AddDays(15),
+            organizerId: organizer.Id,
+            status: EventStatus.Published);
+        publishedEvent.MaxParticipants = 100;
+
+        _context.Events.AddRange(pastEvent, draftEvent, publishedEvent);
+        await _context.SaveChangesAsync();
+
+        // Add registrations with payments
+        var participant1 = TestDataFactory.CreateUser(email: "p1@example.com", role: UserRole.Participant);
+        var participant2 = TestDataFactory.CreateUser(email: "p2@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(participant1, participant2);
+        await _context.SaveChangesAsync();
+
+        var reg1 = TestDataFactory.CreateRegistration(publishedEvent.Id, participant1.Id, RegistrationStatus.Confirmed);
+        var reg2 = TestDataFactory.CreateRegistration(publishedEvent.Id, participant2.Id, RegistrationStatus.Pending);
+        _context.Registrations.AddRange(reg1, reg2);
+        await _context.SaveChangesAsync();
+
+        var payment = TestDataFactory.CreatePayment(reg1.Id, 50.00m, PaymentMethod.Cash);
+        _context.Payments.Add(payment);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetOrganizerDashboard();
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var dashboard = okResult.Value.Should().BeOfType<OrganizerDashboardDto>().Subject;
+        dashboard.TotalEvents.Should().Be(3);
+        dashboard.PublishedEvents.Should().Be(1);
+        dashboard.DraftEvents.Should().Be(1);
+        dashboard.TotalRegistrations.Should().Be(2);
+        dashboard.ConfirmedRegistrations.Should().Be(1);
+        dashboard.PendingRegistrations.Should().Be(1);
+        dashboard.TotalRevenue.Should().Be(50.00m);
+        dashboard.UpcomingEvents.Should().HaveCount(2);
+    }
+
+    [Fact]
+    public async Task GetOrganizerDashboard_EmptyOrganizer_ReturnsEmptyDashboard()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetOrganizerDashboard();
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var dashboard = okResult.Value.Should().BeOfType<OrganizerDashboardDto>().Subject;
+        dashboard.TotalEvents.Should().Be(0);
+        dashboard.TotalRegistrations.Should().Be(0);
+        dashboard.TotalRevenue.Should().Be(0);
+        dashboard.UpcomingEvents.Should().BeEmpty();
+    }
+
+    #endregion
+
+    #region Participant Dashboard - Positive Tests
+
+    [Fact]
+    public async Task GetParticipantDashboard_ReturnsDashboardData()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var upcomingEvent = TestDataFactory.CreateEvent(
+            name: "Upcoming Event",
+            eventDate: DateTime.UtcNow.AddDays(15),
+            organizerId: organizer.Id,
+            status: EventStatus.Published);
+        var pastEvent = TestDataFactory.CreateEvent(
+            name: "Past Event",
+            eventDate: DateTime.UtcNow.AddDays(-10),
+            organizerId: organizer.Id,
+            status: EventStatus.Completed);
+
+        var cancelledEvent = TestDataFactory.CreateEvent(name: "Cancelled Event", organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.AddRange(upcomingEvent, pastEvent, cancelledEvent);
+        await _context.SaveChangesAsync();
+
+        var upcomingReg = TestDataFactory.CreateRegistration(upcomingEvent.Id, participant.Id, RegistrationStatus.Confirmed);
+        var pastReg = TestDataFactory.CreateRegistration(pastEvent.Id, participant.Id, RegistrationStatus.Completed);
+        var cancelledReg = TestDataFactory.CreateRegistration(cancelledEvent.Id, participant.Id, RegistrationStatus.Cancelled);
+        _context.Registrations.AddRange(upcomingReg, pastReg, cancelledReg);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetParticipantDashboard();
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var dashboard = okResult.Value.Should().BeOfType<ParticipantDashboardDto>().Subject;
+        dashboard.TotalRegistrations.Should().Be(3);
+        dashboard.UpcomingEvents.Should().Be(1);
+        dashboard.CompletedEvents.Should().Be(1);
+        dashboard.CancelledRegistrations.Should().Be(1);
+        dashboard.MyRegistrations.Should().HaveCount(3);
+        dashboard.UpcomingEventList.Should().HaveCount(1);
+    }
+
+    [Fact]
+    public async Task GetParticipantDashboard_NoRegistrations_ReturnsEmptyDashboard()
+    {
+        // Arrange
+        var participant = TestDataFactory.CreateUser(role: UserRole.Participant);
+        _context.Users.Add(participant);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetParticipantDashboard();
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var dashboard = okResult.Value.Should().BeOfType<ParticipantDashboardDto>().Subject;
+        dashboard.TotalRegistrations.Should().Be(0);
+        dashboard.UpcomingEvents.Should().Be(0);
+        dashboard.MyRegistrations.Should().BeEmpty();
+    }
+
+    #endregion
+
+    #region Dashboard - Negative Tests
+
+    [Fact]
+    public async Task GetOrganizerDashboard_Unauthenticated_ReturnsUnauthorized()
+    {
+        // Arrange
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        // Act
+        var result = await _controller.GetOrganizerDashboard();
+
+        // Assert
+        result.Result.Should().BeOfType<UnauthorizedResult>();
+    }
+
+    [Fact]
+    public async Task GetParticipantDashboard_Unauthenticated_ReturnsUnauthorized()
+    {
+        // Arrange
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        // Act
+        var result = await _controller.GetParticipantDashboard();
+
+        // Assert
+        result.Result.Should().BeOfType<UnauthorizedResult>();
+    }
+
+    #endregion
+
+    #region Event Capacity Tests
+
+    [Fact]
+    public async Task GetOrganizerDashboard_ShowsEventsNearCapacity()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        // Event at 90% capacity (should appear in near capacity list)
+        var nearCapacityEvent = TestDataFactory.CreateEvent(
+            name: "Near Capacity",
+            eventDate: DateTime.UtcNow.AddDays(10),
+            organizerId: organizer.Id,
+            status: EventStatus.Published);
+        nearCapacityEvent.MaxParticipants = 10;
+
+        // Event at 50% capacity (should NOT appear)
+        var normalEvent = TestDataFactory.CreateEvent(
+            name: "Normal",
+            eventDate: DateTime.UtcNow.AddDays(10),
+            organizerId: organizer.Id,
+            status: EventStatus.Published);
+        normalEvent.MaxParticipants = 100;
+
+        _context.Events.AddRange(nearCapacityEvent, normalEvent);
+        await _context.SaveChangesAsync();
+
+        // Add registrations
+        var participant1 = TestDataFactory.CreateUser(email: "p1@test.com", role: UserRole.Participant);
+        var participant2 = TestDataFactory.CreateUser(email: "p2@test.com", role: UserRole.Participant);
+        _context.Users.AddRange(participant1, participant2);
+        await _context.SaveChangesAsync();
+
+        // Fill near capacity event to 90%
+        for (int i = 0; i < 9; i++)
+        {
+            var p = TestDataFactory.CreateUser(email: $"test{i}@test.com", role: UserRole.Participant);
+            _context.Users.Add(p);
+            var reg = TestDataFactory.CreateRegistration(nearCapacityEvent.Id, p.Id, RegistrationStatus.Confirmed);
+            _context.Registrations.Add(reg);
+        }
+
+        // Fill normal event to 50%
+        for (int i = 0; i < 50; i++)
+        {
+            var p = TestDataFactory.CreateUser(email: $"normal{i}@test.com", role: UserRole.Participant);
+            _context.Users.Add(p);
+            var reg = TestDataFactory.CreateRegistration(normalEvent.Id, p.Id, RegistrationStatus.Confirmed);
+            _context.Registrations.Add(reg);
+        }
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetOrganizerDashboard();
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var dashboard = okResult.Value.Should().BeOfType<OrganizerDashboardDto>().Subject;
+        dashboard.EventsNearCapacity.Should().HaveCount(1);
+        dashboard.EventsNearCapacity.First().Name.Should().Be("Near Capacity");
+    }
+
+    #endregion
+}

backend/backend.Tests/Controllers/EventsControllerTests.cs

@@ -0,0 +1,511 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Moq;
+using FluentAssertions;
+using RacePlannerApi.Controllers;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+using backend.Tests.Utilities;
+
+namespace backend.Tests.Controllers;
+
+public class EventsControllerTests : IDisposable
+{
+    private readonly RacePlannerDbContext _context;
+    private readonly EventsController _controller;
+
+    public EventsControllerTests()
+    {
+        var options = new DbContextOptionsBuilder<RacePlannerDbContext>()
+            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
+            .Options;
+
+        _context = new RacePlannerDbContext(options);
+        _controller = new EventsController(_context);
+    }
+
+    private void SetUserContext(Guid userId, string role = "Participant")
+    {
+        var claims = new List<Claim>
+        {
+            new Claim(ClaimTypes.NameIdentifier, userId.ToString()),
+            new Claim(ClaimTypes.Role, role)
+        };
+        var identity = new ClaimsIdentity(claims, "TestAuthType");
+        var principal = new ClaimsPrincipal(identity);
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = principal }
+        };
+    }
+
+    public void Dispose()
+    {
+        _context.Dispose();
+    }
+
+    #region Create Event - Positive Tests
+
+    [Fact]
+    public async Task CreateEvent_WithValidData_CreatesEvent()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new CreateEventRequest
+        {
+            Name = "Test Marathon",
+            Description = "A test marathon event",
+            EventDate = DateTime.UtcNow.AddDays(30),
+            Location = "Test City",
+            Category = "Running",
+            Tags = new List<string> { "marathon", "running" },
+            MaxParticipants = 100
+        };
+
+        // Act
+        var result = await _controller.CreateEvent(request);
+
+        // Assert
+        var createdResult = result.Result.Should().BeOfType<CreatedAtActionResult>().Subject;
+        var response = createdResult.Value.Should().BeOfType<EventDto>().Subject;
+        response.Name.Should().Be(request.Name);
+        response.Status.Should().Be("Draft");
+        response.Organizer.Id.Should().Be(organizer.Id);
+    }
+
+    [Fact]
+    public async Task CreateEvent_SetsStatusToDraft()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new CreateEventRequest
+        {
+            Name = "Test Event",
+            EventDate = DateTime.UtcNow.AddDays(10),
+            Location = "Test Location",
+            MaxParticipants = 50
+        };
+
+        // Act
+        var result = await _controller.CreateEvent(request);
+
+        // Assert
+        var createdResult = result.Result.Should().BeOfType<CreatedAtActionResult>().Subject;
+        var response = createdResult.Value.Should().BeOfType<EventDto>().Subject;
+        response.Status.Should().Be("Draft");
+    }
+
+    #endregion
+
+    #region Create Event - Negative Tests
+
+    [Fact(Skip = "Authorization attributes require integration tests with full ASP.NET Core pipeline")]
+    public async Task CreateEvent_WithoutOrganizerRole_ReturnsForbidden()
+    {
+        // Arrange
+        var participant = TestDataFactory.CreateUser(role: UserRole.Participant);
+        _context.Users.Add(participant);
+        await _context.SaveChangesAsync();
+        SetUserContext(participant.Id, "Participant");
+
+        var request = new CreateEventRequest
+        {
+            Name = "Test Event",
+            EventDate = DateTime.UtcNow.AddDays(10),
+            Location = "Test Location"
+        };
+
+        // Act
+        var result = await _controller.CreateEvent(request);
+
+        // Assert
+        result.Result.Should().BeOfType<ForbidResult>();
+    }
+
+    [Fact]
+    public async Task CreateEvent_WithUnauthenticatedUser_ReturnsUnauthorized()
+    {
+        // Arrange
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        var request = new CreateEventRequest
+        {
+            Name = "Test Event",
+            EventDate = DateTime.UtcNow.AddDays(10),
+            Location = "Test Location"
+        };
+
+        // Act
+        var result = await _controller.CreateEvent(request);
+
+        // Assert
+        result.Result.Should().BeOfType<UnauthorizedResult>();
+    }
+
+    #endregion
+
+    #region Get Events - Positive Tests
+
+    [Fact]
+    public async Task GetEvents_ReturnsPublishedEventsForAnonymous()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var publishedEvent = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        var draftEvent = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Draft);
+        _context.Events.AddRange(publishedEvent, draftEvent);
+        await _context.SaveChangesAsync();
+
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        // Act
+        var result = await _controller.GetEvents();
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var events = okResult.Value.Should().BeAssignableTo<IEnumerable<EventDto>>().Subject;
+        events.Should().HaveCount(1);
+        events.First().Status.Should().Be("Published");
+    }
+
+    [Fact]
+    public async Task GetEvents_WithCategoryFilter_ReturnsFilteredEvents()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var runningEvent = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        runningEvent.Category = "Running";
+        var cyclingEvent = TestDataFactory.CreateEvent(name: "Cycling Event", organizerId: organizer.Id, status: EventStatus.Published);
+        cyclingEvent.Category = "Cycling";
+
+        _context.Events.AddRange(runningEvent, cyclingEvent);
+        await _context.SaveChangesAsync();
+
+        // Set anonymous context
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        var filter = new EventFilterRequest { Category = "Running" };
+
+        // Act
+        var result = await _controller.GetEvents(filter);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var events = okResult.Value.Should().BeAssignableTo<IEnumerable<EventDto>>().Subject;
+        events.Should().HaveCount(1);
+        events.First().Category.Should().Be("Running");
+    }
+
+    [Fact]
+    public async Task GetEvents_WithDateRangeFilter_ReturnsFilteredEvents()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var futureEvent = TestDataFactory.CreateEvent(
+            name: "Future Event",
+            eventDate: DateTime.UtcNow.AddDays(60),
+            organizerId: organizer.Id,
+            status: EventStatus.Published);
+        var pastEvent = TestDataFactory.CreateEvent(
+            name: "Past Event",
+            eventDate: DateTime.UtcNow.AddDays(-10),
+            organizerId: organizer.Id,
+            status: EventStatus.Published);
+
+        _context.Events.AddRange(futureEvent, pastEvent);
+        await _context.SaveChangesAsync();
+
+        // Set anonymous context
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        var filter = new EventFilterRequest
+        {
+            FromDate = DateTime.UtcNow.AddDays(1),
+            ToDate = DateTime.UtcNow.AddDays(100)
+        };
+
+        // Act
+        var result = await _controller.GetEvents(filter);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var events = okResult.Value.Should().BeAssignableTo<IEnumerable<EventDto>>().Subject;
+        events.Should().HaveCount(1);
+        events.First().Name.Should().Be("Future Event");
+    }
+
+    #endregion
+
+    #region Get Single Event - Positive Tests
+
+    [Fact]
+    public async Task GetEvent_ReturnsPublishedEvent()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        // Act
+        var result = await _controller.GetEvent(eventEntity.Id);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value.Should().BeOfType<EventDto>().Subject;
+        response.Id.Should().Be(eventEntity.Id);
+        response.Name.Should().Be(eventEntity.Name);
+    }
+
+    [Fact]
+    public async Task GetEvent_OrganizerCanViewOwnDraftEvent()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var draftEvent = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Draft);
+        _context.Events.Add(draftEvent);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetEvent(draftEvent.Id);
+
+        // Assert
+        result.Result.Should().BeOfType<OkObjectResult>();
+    }
+
+    #endregion
+
+    #region Get Single Event - Negative Tests
+
+    [Fact]
+    public async Task GetEvent_DraftEventNotVisibleToPublic()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var draftEvent = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Draft);
+        _context.Events.Add(draftEvent);
+        await _context.SaveChangesAsync();
+
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        // Act
+        var result = await _controller.GetEvent(draftEvent.Id);
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    [Fact]
+    public async Task GetEvent_NonExistentEvent_ReturnsNotFound()
+    {
+        // Arrange
+        var nonExistentId = Guid.NewGuid();
+
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal() }
+        };
+
+        // Act
+        var result = await _controller.GetEvent(nonExistentId);
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+
+    #region Update Event - Positive Tests
+
+    [Fact]
+    public async Task UpdateEvent_WithValidData_UpdatesEvent()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Draft);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new UpdateEventRequest
+        {
+            Name = "Updated Event Name",
+            Description = "Updated description",
+            Status = EventStatus.Published
+        };
+
+        // Act
+        var result = await _controller.UpdateEvent(eventEntity.Id, request);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value.Should().BeOfType<EventDto>().Subject;
+        response.Name.Should().Be("Updated Event Name");
+        response.Status.Should().Be("Published");
+    }
+
+    #endregion
+
+    #region Update Event - Negative Tests
+
+    [Fact]
+    public async Task UpdateEvent_NonOrganizer_ReturnsForbidden()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var otherUser = TestDataFactory.CreateUser(email: "other@example.com", role: UserRole.Organizer);
+        _context.Users.AddRange(organizer, otherUser);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(otherUser.Id, "Organizer");
+
+        var request = new UpdateEventRequest { Name = "Hacked Name" };
+
+        // Act
+        var result = await _controller.UpdateEvent(eventEntity.Id, request);
+
+        // Assert
+        result.Result.Should().BeOfType<ForbidResult>();
+    }
+
+    [Fact]
+    public async Task UpdateEvent_NonExistentEvent_ReturnsNotFound()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new UpdateEventRequest { Name = "Updated Name" };
+
+        // Act
+        var result = await _controller.UpdateEvent(Guid.NewGuid(), request);
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+
+    #region Delete Event - Positive Tests
+
+    [Fact]
+    public async Task DeleteEvent_OrganizerCanDeleteOwnEvent()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.DeleteEvent(eventEntity.Id);
+
+        // Assert
+        result.Should().BeOfType<NoContentResult>();
+
+        var deletedEvent = await _context.Events.FindAsync(eventEntity.Id);
+        deletedEvent.Should().BeNull();
+    }
+
+    #endregion
+
+    #region Delete Event - Negative Tests
+
+    [Fact]
+    public async Task DeleteEvent_NonOrganizer_ReturnsForbidden()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var otherUser = TestDataFactory.CreateUser(email: "other@example.com", role: UserRole.Organizer);
+        _context.Users.AddRange(organizer, otherUser);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(otherUser.Id, "Organizer");
+
+        // Act
+        var result = await _controller.DeleteEvent(eventEntity.Id);
+
+        // Assert
+        result.Should().BeOfType<ForbidResult>();
+    }
+
+    [Fact]
+    public async Task DeleteEvent_NonExistentEvent_ReturnsNotFound()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.DeleteEvent(Guid.NewGuid());
+
+        // Assert
+        result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+}

backend/backend.Tests/Controllers/PaymentsControllerTests.cs

@@ -0,0 +1,381 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Moq;
+using FluentAssertions;
+using RacePlannerApi.Controllers;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+using backend.Tests.Utilities;
+
+namespace backend.Tests.Controllers;
+
+public class PaymentsControllerTests : IDisposable
+{
+    private readonly RacePlannerDbContext _context;
+    private readonly PaymentsController _controller;
+
+    public PaymentsControllerTests()
+    {
+        var options = new DbContextOptionsBuilder<RacePlannerDbContext>()
+            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
+            .Options;
+
+        _context = new RacePlannerDbContext(options);
+        _controller = new PaymentsController(_context);
+    }
+
+    private void SetUserContext(Guid userId, string role = "Participant")
+    {
+        var claims = new List<Claim>
+        {
+            new Claim(ClaimTypes.NameIdentifier, userId.ToString()),
+            new Claim(ClaimTypes.Role, role)
+        };
+        var identity = new ClaimsIdentity(claims, "TestAuthType");
+        var principal = new ClaimsPrincipal(identity);
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = principal }
+        };
+    }
+
+    public void Dispose()
+    {
+        _context.Dispose();
+    }
+
+    #region Record Payment - Positive Tests
+
+    [Fact]
+    public async Task RecordPayment_WithValidData_RecordsPayment()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id, RegistrationStatus.Confirmed);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new CreatePaymentRequest
+        {
+            RegistrationId = registration.Id,
+            Amount = 50.00m,
+            Method = PaymentMethod.Cash,
+            Notes = "Cash payment received"
+        };
+
+        // Act
+        var result = await _controller.RecordPayment(request);
+
+        // Assert
+        var createdResult = result.Result.Should().BeOfType<CreatedAtActionResult>().Subject;
+        var response = createdResult.Value.Should().BeOfType<PaymentDto>().Subject;
+        response.Amount.Should().Be(50.00m);
+        response.Method.Should().Be("Cash");
+    }
+
+    [Fact]
+    public async Task RecordPayment_OnlinePayment_WithTransactionId()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant2@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id, RegistrationStatus.Confirmed);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new CreatePaymentRequest
+        {
+            RegistrationId = registration.Id,
+            Amount = 75.00m,
+            Method = PaymentMethod.Online,
+            TransactionId = "txn_12345",
+            Notes = "Online payment"
+        };
+
+        // Act
+        var result = await _controller.RecordPayment(request);
+
+        // Assert
+        var createdResult = result.Result.Should().BeOfType<CreatedAtActionResult>().Subject;
+        var response = createdResult.Value.Should().BeOfType<PaymentDto>().Subject;
+        response.Method.Should().Be("Online");
+        response.TransactionId.Should().Be("txn_12345");
+    }
+
+    #endregion
+
+    #region Record Payment - Negative Tests
+
+    [Fact]
+    public async Task RecordPayment_ForCancelledRegistration_ReturnsBadRequest()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant3@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id, RegistrationStatus.Cancelled);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new CreatePaymentRequest
+        {
+            RegistrationId = registration.Id,
+            Amount = 50.00m,
+            Method = PaymentMethod.Cash
+        };
+
+        // Act
+        var result = await _controller.RecordPayment(request);
+
+        // Assert
+        var badRequestResult = result.Result.Should().BeOfType<BadRequestObjectResult>().Subject;
+        badRequestResult.Value.Should().BeEquivalentTo(new { error = "Cannot record payment for cancelled registration" });
+    }
+
+    [Fact]
+    public async Task RecordPayment_ForNonExistentRegistration_ReturnsNotFound()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        var request = new CreatePaymentRequest
+        {
+            RegistrationId = Guid.NewGuid(),
+            Amount = 50.00m,
+            Method = PaymentMethod.Cash
+        };
+
+        // Act
+        var result = await _controller.RecordPayment(request);
+
+        // Assert
+        var notFoundResult = result.Result.Should().BeOfType<NotFoundObjectResult>().Subject;
+        notFoundResult.Value.Should().BeEquivalentTo(new { error = "Registration not found" });
+    }
+
+    [Fact]
+    public async Task RecordPayment_NonOrganizer_ReturnsForbidden()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant4@example.com", role: UserRole.Participant);
+        var otherOrganizer = TestDataFactory.CreateUser(email: "other@example.com", role: UserRole.Organizer);
+        _context.Users.AddRange(organizer, participant, otherOrganizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(otherOrganizer.Id, "Organizer");
+
+        var request = new CreatePaymentRequest
+        {
+            RegistrationId = registration.Id,
+            Amount = 50.00m,
+            Method = PaymentMethod.Cash
+        };
+
+        // Act
+        var result = await _controller.RecordPayment(request);
+
+        // Assert
+        result.Result.Should().BeOfType<ForbidResult>();
+    }
+
+    #endregion
+
+    #region Get Payment Status - Positive Tests
+
+    [Fact]
+    public async Task GetPaymentStatus_UnpaidRegistration_ReturnsUnpaid()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant5@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetPaymentStatus(registration.Id);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value;
+        response.Should().NotBeNull();
+    }
+
+    [Fact]
+    public async Task GetPaymentStatus_PaidRegistration_ReturnsPaid()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant6@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        // Record a payment
+        var payment = TestDataFactory.CreatePayment(registration.Id, 50.00m, PaymentMethod.Cash);
+        _context.Payments.Add(payment);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetPaymentStatus(registration.Id);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value;
+        response.Should().NotBeNull();
+    }
+
+    #endregion
+
+    #region Get Payment Status - Negative Tests
+
+    [Fact]
+    public async Task GetPaymentStatus_NonExistentRegistration_ReturnsNotFound()
+    {
+        // Arrange
+        var participant = TestDataFactory.CreateUser(role: UserRole.Participant);
+        _context.Users.Add(participant);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetPaymentStatus(Guid.NewGuid());
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+
+    #region Get Payment Report - Positive Tests
+
+    [Fact]
+    public async Task GetPaymentReport_ReturnsEventPaymentSummary()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant1 = TestDataFactory.CreateUser(email: "p1@example.com", role: UserRole.Participant);
+        var participant2 = TestDataFactory.CreateUser(email: "p2@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant1, participant2);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration1 = TestDataFactory.CreateRegistration(eventEntity.Id, participant1.Id, RegistrationStatus.Confirmed);
+        var registration2 = TestDataFactory.CreateRegistration(eventEntity.Id, participant2.Id, RegistrationStatus.Confirmed);
+        _context.Registrations.AddRange(registration1, registration2);
+        await _context.SaveChangesAsync();
+
+        // Add payment for first registration
+        var payment = TestDataFactory.CreatePayment(registration1.Id, 50.00m, PaymentMethod.Cash);
+        _context.Payments.Add(payment);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetPaymentReport(eventEntity.Id);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value.Should().BeOfType<PaymentReportDto>().Subject;
+        response.TotalCollected.Should().Be(50.00m);
+        response.TotalRegistrations.Should().Be(2);
+        response.PaidRegistrations.Should().Be(1);
+        response.UnpaidRegistrations.Should().Be(1);
+    }
+
+    #endregion
+
+    #region Get Payment Report - Negative Tests
+
+    [Fact]
+    public async Task GetPaymentReport_NonOrganizer_ReturnsForbidden()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var otherOrganizer = TestDataFactory.CreateUser(email: "other@example.com", role: UserRole.Organizer);
+        _context.Users.AddRange(organizer, otherOrganizer);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(otherOrganizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetPaymentReport(eventEntity.Id);
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    [Fact]
+    public async Task GetPaymentReport_NonExistentEvent_ReturnsNotFound()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        _context.Users.Add(organizer);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetPaymentReport(Guid.NewGuid());
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+}

backend/backend.Tests/Controllers/RegistrationsControllerTests.cs

@@ -0,0 +1,477 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Moq;
+using FluentAssertions;
+using RacePlannerApi.Controllers;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+using backend.Tests.Utilities;
+
+namespace backend.Tests.Controllers;
+
+public class RegistrationsControllerTests : IDisposable
+{
+    private readonly RacePlannerDbContext _context;
+    private readonly RegistrationsController _controller;
+
+    public RegistrationsControllerTests()
+    {
+        var options = new DbContextOptionsBuilder<RacePlannerDbContext>()
+            .UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
+            .Options;
+
+        _context = new RacePlannerDbContext(options);
+        _controller = new RegistrationsController(_context);
+    }
+
+    private void SetUserContext(Guid userId, string role = "Participant")
+    {
+        var claims = new List<Claim>
+        {
+            new Claim(ClaimTypes.NameIdentifier, userId.ToString()),
+            new Claim(ClaimTypes.Role, role)
+        };
+        var identity = new ClaimsIdentity(claims, "TestAuthType");
+        var principal = new ClaimsPrincipal(identity);
+        _controller.ControllerContext = new ControllerContext
+        {
+            HttpContext = new DefaultHttpContext { User = principal }
+        };
+    }
+
+    public void Dispose()
+    {
+        _context.Dispose();
+    }
+
+    #region Create Registration - Positive Tests
+
+    [Fact]
+    public async Task CreateRegistration_WithValidData_CreatesRegistration()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        var request = new CreateRegistrationRequest
+        {
+            EventId = eventEntity.Id,
+            Category = "Open",
+            EmergencyContact = "Emergency Contact: 123-456-7890"
+        };
+
+        // Act
+        var result = await _controller.CreateRegistration(request);
+
+        // Assert
+        var createdResult = result.Result.Should().BeOfType<CreatedAtActionResult>().Subject;
+        var response = createdResult.Value.Should().BeOfType<RegistrationDto>().Subject;
+        response.EventId.Should().Be(eventEntity.Id);
+        response.ParticipantId.Should().Be(participant.Id);
+        response.Status.Should().Be("Pending");
+    }
+
+    [Fact]
+    public async Task CreateRegistration_SetsStatusToPending()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant2@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        var request = new CreateRegistrationRequest
+        {
+            EventId = eventEntity.Id,
+            Category = "Open"
+        };
+
+        // Act
+        var result = await _controller.CreateRegistration(request);
+
+        // Assert
+        var createdResult = result.Result.Should().BeOfType<CreatedAtActionResult>().Subject;
+        var response = createdResult.Value.Should().BeOfType<RegistrationDto>().Subject;
+        response.Status.Should().Be("Pending");
+    }
+
+    #endregion
+
+    #region Create Registration - Negative Tests
+
+    [Fact]
+    public async Task CreateRegistration_ForDraftEvent_ReturnsBadRequest()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant3@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var draftEvent = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Draft);
+        _context.Events.Add(draftEvent);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        var request = new CreateRegistrationRequest
+        {
+            EventId = draftEvent.Id,
+            Category = "Open"
+        };
+
+        // Act
+        var result = await _controller.CreateRegistration(request);
+
+        // Assert
+        var badRequestResult = result.Result.Should().BeOfType<BadRequestObjectResult>().Subject;
+        badRequestResult.Value.Should().BeEquivalentTo(new { error = "Event is not open for registration" });
+    }
+
+    [Fact]
+    public async Task CreateRegistration_DuplicateRegistration_ReturnsConflict()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant4@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        // Create existing registration
+        var existingRegistration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id);
+        _context.Registrations.Add(existingRegistration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        var request = new CreateRegistrationRequest
+        {
+            EventId = eventEntity.Id,
+            Category = "Open"
+        };
+
+        // Act
+        var result = await _controller.CreateRegistration(request);
+
+        // Assert
+        var conflictResult = result.Result.Should().BeOfType<ConflictObjectResult>().Subject;
+        conflictResult.Value.Should().BeEquivalentTo(new { error = "Already registered for this event" });
+    }
+
+    [Fact]
+    public async Task CreateRegistration_ForFullEvent_ReturnsBadRequest()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant1 = TestDataFactory.CreateUser(email: "participant1@example.com", role: UserRole.Participant);
+        var participant2 = TestDataFactory.CreateUser(email: "participant2@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant1, participant2);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        eventEntity.MaxParticipants = 1;
+        _context.Events.Add(eventEntity);
+
+        // Fill the event
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant1.Id, RegistrationStatus.Confirmed);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant2.Id, "Participant");
+
+        var request = new CreateRegistrationRequest
+        {
+            EventId = eventEntity.Id,
+            Category = "Open"
+        };
+
+        // Act
+        var result = await _controller.CreateRegistration(request);
+
+        // Assert
+        var badRequestResult = result.Result.Should().BeOfType<BadRequestObjectResult>().Subject;
+        badRequestResult.Value.Should().BeEquivalentTo(new { error = "Event is full" });
+    }
+
+    [Fact]
+    public async Task CreateRegistration_ForNonExistentEvent_ReturnsNotFound()
+    {
+        // Arrange
+        var participant = TestDataFactory.CreateUser(role: UserRole.Participant);
+        _context.Users.Add(participant);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        var request = new CreateRegistrationRequest
+        {
+            EventId = Guid.NewGuid(),
+            Category = "Open"
+        };
+
+        // Act
+        var result = await _controller.CreateRegistration(request);
+
+        // Assert
+        var notFoundResult = result.Result.Should().BeOfType<NotFoundObjectResult>().Subject;
+        notFoundResult.Value.Should().BeEquivalentTo(new { error = "Event not found" });
+    }
+
+    #endregion
+
+    #region Get Registration - Positive Tests
+
+    [Fact]
+    public async Task GetRegistration_ParticipantCanViewOwnRegistration()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant5@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetRegistration(registration.Id);
+
+        // Assert
+        result.Result.Should().BeOfType<OkObjectResult>();
+    }
+
+    [Fact]
+    public async Task GetRegistration_OrganizerCanViewAnyRegistrationForTheirEvent()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant6@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.GetRegistration(registration.Id);
+
+        // Assert
+        result.Result.Should().BeOfType<OkObjectResult>();
+    }
+
+    [Fact]
+    public async Task GetMyRegistrations_ReturnsParticipantsRegistrations()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant7@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var event1 = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        var event2 = TestDataFactory.CreateEvent(name: "Event 2", organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.AddRange(event1, event2);
+
+        var registration1 = TestDataFactory.CreateRegistration(event1.Id, participant.Id);
+        var registration2 = TestDataFactory.CreateRegistration(event2.Id, participant.Id);
+        _context.Registrations.AddRange(registration1, registration2);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetMyRegistrations();
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var registrations = okResult.Value.Should().BeAssignableTo<IEnumerable<RegistrationDto>>().Subject;
+        registrations.Should().HaveCount(2);
+    }
+
+    #endregion
+
+    #region Get Registration - Negative Tests
+
+    [Fact]
+    public async Task GetRegistration_NonExistentRegistration_ReturnsNotFound()
+    {
+        // Arrange
+        var participant = TestDataFactory.CreateUser(role: UserRole.Participant);
+        _context.Users.Add(participant);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.GetRegistration(Guid.NewGuid());
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+
+    #region Cancel Registration - Positive Tests
+
+    [Fact]
+    public async Task CancelRegistration_ParticipantCanCancelOwnRegistration()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant8@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id, RegistrationStatus.Pending);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.CancelRegistration(registration.Id);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value.Should().BeOfType<RegistrationDto>().Subject;
+        response.Status.Should().Be("Cancelled");
+
+        // Verify in database
+        var updatedRegistration = await _context.Registrations.FindAsync(registration.Id);
+        updatedRegistration!.Status.Should().Be(RegistrationStatus.Cancelled);
+    }
+
+    [Fact]
+    public async Task CancelRegistration_OrganizerCanCancelAnyRegistration()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant9@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id, RegistrationStatus.Pending);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(organizer.Id, "Organizer");
+
+        // Act
+        var result = await _controller.CancelRegistration(registration.Id);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value.Should().BeOfType<RegistrationDto>().Subject;
+        response.Status.Should().Be("Cancelled");
+    }
+
+    #endregion
+
+    #region Cancel Registration - Negative Tests
+
+    [Fact]
+    public async Task CancelRegistration_NonExistentRegistration_ReturnsNotFound()
+    {
+        // Arrange
+        var participant = TestDataFactory.CreateUser(role: UserRole.Participant);
+        _context.Users.Add(participant);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        // Act
+        var result = await _controller.CancelRegistration(Guid.NewGuid());
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+
+    #region Update Registration - Positive Tests
+
+    [Fact]
+    public async Task UpdateRegistration_ParticipantCanUpdateOwnRegistration()
+    {
+        // Arrange
+        var organizer = TestDataFactory.CreateUser(role: UserRole.Organizer);
+        var participant = TestDataFactory.CreateUser(email: "participant10@example.com", role: UserRole.Participant);
+        _context.Users.AddRange(organizer, participant);
+
+        var eventEntity = TestDataFactory.CreateEvent(organizerId: organizer.Id, status: EventStatus.Published);
+        _context.Events.Add(eventEntity);
+
+        var registration = TestDataFactory.CreateRegistration(eventEntity.Id, participant.Id);
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        var request = new UpdateRegistrationRequest
+        {
+            Category = "Updated Category",
+            EmergencyContact = "Updated Emergency Contact"
+        };
+
+        // Act
+        var result = await _controller.UpdateRegistration(registration.Id, request);
+
+        // Assert
+        var okResult = result.Result.Should().BeOfType<OkObjectResult>().Subject;
+        var response = okResult.Value.Should().BeOfType<RegistrationDto>().Subject;
+        response.Category.Should().Be("Updated Category");
+    }
+
+    #endregion
+
+    #region Update Registration - Negative Tests
+
+    [Fact]
+    public async Task UpdateRegistration_NonExistentRegistration_ReturnsNotFound()
+    {
+        // Arrange
+        var participant = TestDataFactory.CreateUser(role: UserRole.Participant);
+        _context.Users.Add(participant);
+        await _context.SaveChangesAsync();
+
+        SetUserContext(participant.Id, "Participant");
+
+        var request = new UpdateRegistrationRequest { Category = "Updated" };
+
+        // Act
+        var result = await _controller.UpdateRegistration(Guid.NewGuid(), request);
+
+        // Assert
+        result.Result.Should().BeOfType<NotFoundResult>();
+    }
+
+    #endregion
+}

backend/backend.Tests/Utilities/TestDataFactory.cs

@@ -84,7 +84,8 @@ public static class TestDataFactory
     public static Announcement CreateAnnouncement(
         Guid eventId,
         string title = "Test Announcement",
-        string content = "Test announcement content")
+        string content = "Test announcement content",
+        Guid? authorId = null)
     {
         return new Announcement
         {
@@ -92,6 +93,7 @@ public static class TestDataFactory
             EventId = eventId,
             Title = title,
             Content = content,
+            AuthorId = authorId ?? Guid.NewGuid(),
             CreatedAt = DateTime.UtcNow,
             UpdatedAt = DateTime.UtcNow
         };