diff --git a/Streetcode/Streetcode.BLL/MediatR/Transactions/TransactionLink/GetAll/GetAllTransactLinksHandler.cs b/Streetcode/Streetcode.BLL/MediatR/Transactions/TransactionLink/GetAll/GetAllTransactLinksHandler.cs
index 74e6002..17e8774 100644
--- a/Streetcode/Streetcode.BLL/MediatR/Transactions/TransactionLink/GetAll/GetAllTransactLinksHandler.cs
+++ b/Streetcode/Streetcode.BLL/MediatR/Transactions/TransactionLink/GetAll/GetAllTransactLinksHandler.cs
@@ -26,7 +26,7 @@ public async Task<Result<IEnumerable<TransactLinkDTO>>> Handle(GetAllTransactLin
     {
         var transactLinks = await _repositoryWrapper.TransactLinksRepository.GetAllAsync();
 
-        if (transactLinks.Any())
+        if (transactLinks?.Any() ?? false)
         {
             return Result.Ok(_mapper.Map<IEnumerable<TransactLinkDTO>>(transactLinks));
         }
@@ -35,4 +35,4 @@ public async Task<Result<IEnumerable<TransactLinkDTO>>> Handle(GetAllTransactLin
         _logger.LogError(request, errorMsg);
         return Result.Fail(new Error(errorMsg));
     }
-}
+}
\ No newline at end of file
diff --git a/Streetcode/Streetcode.XUnitTest/MediatR/Transactions/TransactionLink/GetAll/GetAllTransactLinksHandlerTests.cs b/Streetcode/Streetcode.XUnitTest/MediatR/Transactions/TransactionLink/GetAll/GetAllTransactLinksHandlerTests.cs
new file mode 100644
index 0000000..7116930
--- /dev/null
+++ b/Streetcode/Streetcode.XUnitTest/MediatR/Transactions/TransactionLink/GetAll/GetAllTransactLinksHandlerTests.cs
@@ -0,0 +1,133 @@
+using System.Linq.Expressions;
+using AutoMapper;
+using FluentAssertions;
+using Microsoft.EntityFrameworkCore.Query;
+using Moq;
+using Streetcode.BLL.DTO.Transactions;
+using Streetcode.BLL.Interfaces.Logging;
+using Streetcode.BLL.Mapping.Transactions;
+using Streetcode.BLL.MediatR.Transactions.TransactionLink.GetAll;
+using Streetcode.DAL.Entities.Transactions;
+using Streetcode.DAL.Repositories.Interfaces.Base;
+using Streetcode.Resources;
+using Streetcode.Shared.Extensions;
+using Xunit;
+
+namespace Streetcode.XUnitTest.MediatR.Transactions.TransactionLink;
+
+public class GetAllTransactLinksHandlerTests
+{
+    private readonly Mock<IRepositoryWrapper> _mockRepo;
+    private readonly Mock<ILoggerService> _mockLogger;
+    private readonly IMapper _mapper;
+
+    public GetAllTransactLinksHandlerTests()
+    {
+        _mockRepo = new Mock<IRepositoryWrapper>();
+        _mockLogger = new Mock<ILoggerService>();
+
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.AddProfile(new TransactionLinkProfile());
+        });
+        _mapper = new Mapper(config);
+    }
+
+    [Fact]
+    public async Task Handle_LinksExist_ReturnsSuccessWithMappedDTOs()
+    {
+        // Arrange
+        var links = new List<Streetcode.DAL.Entities.Transactions.TransactionLink>
+        {
+            new() { Id = 1, Url = "https://streetcode.com/1", StreetcodeId = 1 },
+            new() { Id = 2, Url = "https://streetcode.com/2", StreetcodeId = 2 }
+        };
+
+        _mockRepo.Setup(r => r.TransactLinksRepository.GetAllAsync(
+            It.IsAny<Expression<Func<Streetcode.DAL.Entities.Transactions.TransactionLink, bool>>>(),
+            It.IsAny<Func<IQueryable<Streetcode.DAL.Entities.Transactions.TransactionLink>, IIncludableQueryable<Streetcode.DAL.Entities.Transactions.TransactionLink, object>>>(),
+            It.IsAny<bool>()))
+            .ReturnsAsync(links);
+
+        var handler = new GetAllTransactLinksHandler(
+            _mockRepo.Object,
+            _mapper,
+            _mockLogger.Object);
+
+        // Act
+        var result = await handler.Handle(
+            new GetAllTransactLinksQuery(),
+            CancellationToken.None);
+
+        // Assert
+        result.IsSuccess.Should().BeTrue();
+        result.Value.Should().HaveCount(2);
+        result.Value.First().Url.Should().Be("https://streetcode.com/1");
+    }
+
+    [Fact]
+    public async Task Handle_NoLinksFound_ReturnsFailureAndLogsError()
+    {
+        // Arrange
+        var query = new GetAllTransactLinksQuery();
+
+        _mockRepo.Setup(r => r.TransactLinksRepository.GetAllAsync(
+            (Expression<Func<Streetcode.DAL.Entities.Transactions.TransactionLink, bool>>)null!,
+            (Func<IQueryable<Streetcode.DAL.Entities.Transactions.TransactionLink>, IIncludableQueryable<Streetcode.DAL.Entities.Transactions.TransactionLink, object>>)null!,
+            false))
+            .ReturnsAsync(new List<Streetcode.DAL.Entities.Transactions.TransactionLink>());
+
+        var handler = new GetAllTransactLinksHandler(
+            _mockRepo.Object,
+            _mapper,
+            _mockLogger.Object);
+
+        var expectedError = Messages.Error_EntitiesNotFound.Format(
+            nameof(Streetcode.DAL.Entities.Transactions.TransactionLink));
+
+        // Act
+        var result = await handler.Handle(
+            query,
+            CancellationToken.None);
+
+        // Assert
+        result.IsFailed.Should().BeTrue();
+        result.Errors.Should().ContainSingle()
+            .Which.Message.Should().Be(expectedError);
+
+        _mockLogger.Verify(x => x.LogError(
+            query,
+            expectedError), Times.Once);
+    }
+
+    [Fact]
+    public async Task Handle_RepositoryReturnsNull_ReturnsFailure()
+    {
+        // Arrange
+        _mockRepo.Setup(r => r.TransactLinksRepository.GetAllAsync(
+            null,
+            null,
+            false))
+            .ReturnsAsync((IEnumerable<Streetcode.DAL.Entities.Transactions.TransactionLink>?)null);
+
+        var handler = new GetAllTransactLinksHandler(
+            _mockRepo.Object,
+            _mapper,
+            _mockLogger.Object);
+
+        var query = new GetAllTransactLinksQuery();
+
+        string expectedError = Messages.Error_EntitiesNotFound.Format(
+            nameof(Streetcode.DAL.Entities.Transactions.TransactionLink));
+
+        // Act
+        var result = await handler.Handle(
+            query,
+            CancellationToken.None);
+
+        // Assert
+        result.IsFailed.Should().BeTrue();
+        result.Errors.Should().ContainSingle()
+            .Which.Message.Should().Be(expectedError);
+    }
+}
\ No newline at end of file
diff --git a/Streetcode/Streetcode.XUnitTest/MediatR/Transactions/TransactionLink/GetById/GetTransactLinkByIdHandlerTests.cs b/Streetcode/Streetcode.XUnitTest/MediatR/Transactions/TransactionLink/GetById/GetTransactLinkByIdHandlerTests.cs
new file mode 100644
index 0000000..285796a
--- /dev/null
+++ b/Streetcode/Streetcode.XUnitTest/MediatR/Transactions/TransactionLink/GetById/GetTransactLinkByIdHandlerTests.cs
@@ -0,0 +1,110 @@
+using System.Linq.Expressions;
+using AutoMapper;
+using FluentAssertions;
+using Microsoft.EntityFrameworkCore.Query;
+using Moq;
+using Streetcode.BLL.DTO.Transactions;
+using Streetcode.BLL.Interfaces.Logging;
+using Streetcode.BLL.Mapping.Transactions;
+using Streetcode.BLL.MediatR.Transactions.TransactionLink.GetById;
+using Streetcode.DAL.Entities.Transactions;
+using Streetcode.DAL.Repositories.Interfaces.Base;
+using Streetcode.Resources;
+using Streetcode.Shared.Extensions;
+using Xunit;
+
+namespace Streetcode.XUnitTest.MediatR.Transactions.TransactionLink;
+
+public class GetTransactLinkByIdHandlerTests
+{
+    private readonly Mock<IRepositoryWrapper> _mockRepo;
+    private readonly Mock<ILoggerService> _mockLogger;
+    private readonly IMapper _mapper;
+
+    public GetTransactLinkByIdHandlerTests()
+    {
+        _mockRepo = new Mock<IRepositoryWrapper>();
+        _mockLogger = new Mock<ILoggerService>();
+
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.AddProfile(new TransactionLinkProfile());
+        });
+        _mapper = new Mapper(config);
+    }
+
+    [Fact]
+    public async Task Handle_LinkExists_ReturnsSuccessWithMappedDTO()
+    {
+        // Arrange
+        int testId = 1;
+        var link = new Streetcode.DAL.Entities.Transactions.TransactionLink
+        {
+            Id = testId,
+            Url = "https://streetcode.com/donate",
+            StreetcodeId = 10
+        };
+        var query = new GetTransactLinkByIdQuery(
+            testId);
+
+        _mockRepo.Setup(r => r.TransactLinksRepository.GetFirstOrDefaultAsync(
+            It.IsAny<Expression<Func<Streetcode.DAL.Entities.Transactions.TransactionLink, bool>>>(),
+            It.IsAny<Func<IQueryable<Streetcode.DAL.Entities.Transactions.TransactionLink>, IIncludableQueryable<Streetcode.DAL.Entities.Transactions.TransactionLink, object>>>(),
+            It.IsAny<bool>()))
+            .ReturnsAsync(link);
+
+        var handler = new GetTransactLinkByIdHandler(
+            _mockRepo.Object,
+            _mapper,
+            _mockLogger.Object);
+
+        // Act
+        var result = await handler.Handle(
+            query,
+            CancellationToken.None);
+
+        // Assert
+        result.IsSuccess.Should().BeTrue();
+        result.Value.Should().BeOfType<TransactLinkDTO>();
+        result.Value.Id.Should().Be(testId);
+        result.Value.Url.Should().Be("https://streetcode.com/donate");
+    }
+
+    [Fact]
+    public async Task Handle_LinkDoesNotExist_ReturnsFailureAndLogsError()
+    {
+        // Arrange
+        int testId = 99;
+        var query = new GetTransactLinkByIdQuery(
+            testId);
+
+        _mockRepo.Setup(r => r.TransactLinksRepository.GetFirstOrDefaultAsync(
+            It.IsAny<Expression<Func<Streetcode.DAL.Entities.Transactions.TransactionLink, bool>>>(),
+            null,
+            false))
+            .ReturnsAsync((Streetcode.DAL.Entities.Transactions.TransactionLink?)null);
+
+        var handler = new GetTransactLinkByIdHandler(
+            _mockRepo.Object,
+            _mapper,
+            _mockLogger.Object);
+
+        var expectedError = Messages.Error_EntityWithIdNotFound.Format(
+            nameof(Streetcode.DAL.Entities.Transactions.TransactionLink),
+            testId);
+
+        // Act
+        var result = await handler.Handle(
+            query,
+            CancellationToken.None);
+
+        // Assert
+        result.IsFailed.Should().BeTrue();
+        result.Errors.Should().ContainSingle()
+            .Which.Message.Should().Be(expectedError);
+
+        _mockLogger.Verify(x => x.LogError(
+            query,
+            expectedError), Times.Once);
+    }
+}
\ No newline at end of file
diff --git a/Streetcode/Streetcode.XUnitTest/MediatR/Transactions/TransactionLink/GetByStreetcodeId/GetTransactLinkByStreetcodeIdHandlerTests.cs b/Streetcode/Streetcode.XUnitTest/MediatR/Transactions/TransactionLink/GetByStreetcodeId/GetTransactLinkByStreetcodeIdHandlerTests.cs
new file mode 100644
index 0000000..991638e
--- /dev/null
+++ b/Streetcode/Streetcode.XUnitTest/MediatR/Transactions/TransactionLink/GetByStreetcodeId/GetTransactLinkByStreetcodeIdHandlerTests.cs
@@ -0,0 +1,109 @@
+using System.Linq.Expressions;
+using AutoMapper;
+using FluentAssertions;
+using Microsoft.EntityFrameworkCore.Query;
+using Moq;
+using Streetcode.BLL.DTO.Transactions;
+using Streetcode.BLL.Interfaces.Logging;
+using Streetcode.BLL.Mapping.Transactions;
+using Streetcode.BLL.MediatR.Transactions.TransactionLink.GetByStreetcodeId;
+using Streetcode.DAL.Entities.Transactions;
+using Streetcode.DAL.Repositories.Interfaces.Base;
+using Streetcode.Resources;
+using Streetcode.Shared.Extensions;
+using Xunit;
+
+namespace Streetcode.XUnitTest.MediatR.Transactions.TransactionLink;
+
+public class GetTransactLinkByStreetcodeIdHandlerTests
+{
+    private readonly Mock<IRepositoryWrapper> _mockRepo;
+    private readonly Mock<ILoggerService> _mockLogger;
+    private readonly IMapper _mapper;
+
+    public GetTransactLinkByStreetcodeIdHandlerTests()
+    {
+        _mockRepo = new Mock<IRepositoryWrapper>();
+        _mockLogger = new Mock<ILoggerService>();
+
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.AddProfile(new TransactionLinkProfile());
+        });
+        _mapper = new Mapper(config);
+    }
+
+    [Fact]
+    public async Task Handle_LinkExists_ReturnsSuccessWithMappedDTO()
+    {
+        // Arrange
+        int streetcodeId = 5;
+        var link = new Streetcode.DAL.Entities.Transactions.TransactionLink
+        {
+            Id = 1,
+            StreetcodeId = streetcodeId,
+            Url = "https://streetcode.com/donate"
+        };
+        var query = new GetTransactLinkByStreetcodeIdQuery(
+            streetcodeId);
+
+        _mockRepo.Setup(r => r.TransactLinksRepository.GetFirstOrDefaultAsync(
+            It.IsAny<Expression<Func<Streetcode.DAL.Entities.Transactions.TransactionLink, bool>>>(),
+            It.IsAny<Func<IQueryable<Streetcode.DAL.Entities.Transactions.TransactionLink>, IIncludableQueryable<Streetcode.DAL.Entities.Transactions.TransactionLink, object>>>(),
+            It.IsAny<bool>()))
+            .ReturnsAsync(link);
+
+        var handler = new GetTransactLinkByStreetcodeIdHandler(
+            _mockRepo.Object,
+            _mapper,
+            _mockLogger.Object);
+
+        // Act
+        var result = await handler.Handle(
+            query,
+            CancellationToken.None);
+
+        // Assert
+        result.IsSuccess.Should().BeTrue();
+        result.Value.Should().NotBeNull();
+        result.Value!.StreetcodeId.Should().Be(streetcodeId);
+    }
+
+    [Fact]
+    public async Task Handle_LinkDoesNotExist_ReturnsFailureAndLogsError()
+    {
+        // Arrange
+        int streetcodeId = 10;
+        var query = new GetTransactLinkByStreetcodeIdQuery(
+            streetcodeId);
+
+        _mockRepo.Setup(r => r.TransactLinksRepository.GetFirstOrDefaultAsync(
+            It.IsAny<Expression<Func<Streetcode.DAL.Entities.Transactions.TransactionLink, bool>>>(),
+            null,
+            false))
+            .ReturnsAsync((Streetcode.DAL.Entities.Transactions.TransactionLink?)null);
+
+        var handler = new GetTransactLinkByStreetcodeIdHandler(
+            _mockRepo.Object,
+            _mapper,
+            _mockLogger.Object);
+
+        var expectedError = Messages.Error_EntityWithStreetcodeIdNotFound.Format(
+            nameof(Streetcode.DAL.Entities.Transactions.TransactionLink),
+            streetcodeId);
+
+        // Act
+        var result = await handler.Handle(
+            query,
+            CancellationToken.None);
+
+        // Assert
+        result.IsFailed.Should().BeTrue();
+        result.Errors.Should().ContainSingle()
+            .Which.Message.Should().Be(expectedError);
+
+        _mockLogger.Verify(x => x.LogError(
+            query,
+            expectedError), Times.Once);
+    }
+}
\ No newline at end of file