diff --git a/src/Logs.Services.Tests/UserServiceTests/GetByIdTests.cs b/src/Logs.Services.Tests/UserServiceTests/GetByIdTests.cs
new file mode 100644
index 0000000..59809c0
--- /dev/null
+++ b/src/Logs.Services.Tests/UserServiceTests/GetByIdTests.cs
@@ -0,0 +1,49 @@
+using Logs.Data.Contracts;
+using Logs.Models;
+using Moq;
+using NUnit.Framework;
+
+namespace Logs.Services.Tests.UserServiceTests
+{
+    [TestFixture]
+    public class GetByIdTests
+    {
+        [TestCase("d547a40d-c45f-4c43-99de-0bfe9199ff95")]
+        [TestCase("99ae8dd3-1067-4141-9675-62e94bb6caaa")]
+        public void TestGetById_ShouldCallRepositoryGetById(string id)
+        {
+            // Arrange
+            var mockedRepository = new Mock<IRepository<User>>();
+            var mockedUnitOfWork = new Mock<IUnitOfWork>();
+
+            var service = new UserService(mockedRepository.Object, mockedUnitOfWork.Object);
+
+            // Act
+            service.GetUserById(id);
+
+            // Assert
+            mockedRepository.Verify(r => r.GetById(id), Times.Once);
+        }
+
+        [TestCase("d547a40d-c45f-4c43-99de-0bfe9199ff95")]
+        [TestCase("99ae8dd3-1067-4141-9675-62e94bb6caaa")]
+        public void TestGetById_ShoulReturnCorrectly(string id)
+        {
+            // Arrange
+            var mockedUser = new Mock<User>();
+
+            var mockedRepository = new Mock<IRepository<User>>();
+            mockedRepository.Setup(r => r.GetById(It.IsAny<object>())).Returns(mockedUser.Object);
+
+            var mockedUnitOfWork = new Mock<IUnitOfWork>();
+
+            var service = new UserService(mockedRepository.Object, mockedUnitOfWork.Object);
+
+            // Act
+            var result = service.GetUserById(id);
+
+            // Assert
+            Assert.AreSame(mockedUser.Object, result);
+        }
+    }
+}