diff --git a/PROFiLiX.Common.Tests/File/FilesAndFoldersTests.cs b/PROFiLiX.Common.Tests/File/FilesAndFoldersTests.cs
index 039cfa6..d2bdb72 100644
--- a/PROFiLiX.Common.Tests/File/FilesAndFoldersTests.cs
+++ b/PROFiLiX.Common.Tests/File/FilesAndFoldersTests.cs
@@ -80,6 +80,27 @@ public void DeleteFolderAsync_WithValidData_ShouldSucceed()
             Assert.That(response, Is.True);
         }
 
+        /// <summary>
+        /// Checks that DeleteFileAsync with with Valid data succeeds.
+        /// </summary>
+        [Test]
+        public void DirectorySizeAsync_WithValidData_ShouldSucceed()
+        {
+            // Arrange
+            var mockILogger = new Mock<ILogger>();
+            var mockFilesAndFolders = new FilesAndFolders(mockILogger.Object);
+            string folderName = "C:\\windows\\temp";
+            Directory.CreateDirectory(folderName);
+            Thread.Sleep(2000);
+            DirectoryInfo di = new DirectoryInfo(folderName);
+
+            // Act
+            var response = mockFilesAndFolders.DirectorySizeAsync(di).Result;
+
+            // Assert
+            Assert.That(response, Is.GreaterThan(0));
+        }
+
         /// <summary>
         /// Checks that FormatFileSize Valid data succeeds.
         /// </summary>
@@ -301,6 +322,24 @@ public void CreateDirectory_WithInvalidFolderName_ShouldThrowArgumentNullExcepti
             Assert.Throws<ArgumentNullException>(() => mockFilesAndFolders.CreateDirectory(rootFolder));
         }
 
+        /// <summary>
+        /// Checks that CheckDirectory with invalid data errors.
+        /// </summary>
+        [Test]
+        public void DirectorySizeAsync_WithInvalidFolderName_ShouldThrowArgumentNullException()
+        {
+            // Arrange
+            var mockILogger = new Mock<ILogger>();
+            var mockFilesAndFolders = new FilesAndFolders(mockILogger.Object);
+            DirectoryInfo? directoryInfo = null;
+
+            // Act + Assert
+            Assert.Throws<AggregateException>(() =>
+            {
+                long result = mockFilesAndFolders.DirectorySizeAsync(directoryInfo).Result;
+            });
+        }
+
         /// <summary>
         /// Checks that CheckDirectory with invalid data errors.
         /// </summary>
diff --git a/PROFiLiX.Common.Tests/Registry/RegistryTests.cs b/PROFiLiX.Common.Tests/Registry/RegistryTests.cs
index ef45de8..2ed19f8 100644
--- a/PROFiLiX.Common.Tests/Registry/RegistryTests.cs
+++ b/PROFiLiX.Common.Tests/Registry/RegistryTests.cs
@@ -12,6 +12,7 @@ namespace PROFiLiX.Common.Tests.Registry
     using PROFiLiX.Common.Registry;
     using PROFiLiX.Common.Registry.Exceptions;
     using PROFiLiX.Common.Registry.Model;
+    using System.IO;
 
     /// <summary>
     /// Class to do Registry unit tests.
@@ -654,6 +655,18 @@ public void InvalidKeyException_WithMessageAndInnerException_ShouldThrowExceptio
             }
         }
 
+        /// <summary>
+        /// Test method to ensure InvalidValueException with message throws correctly.
+        /// </summary>
+        [Test]
+        public void InvalidValueException_WithDefault_ShouldThrowException()
+        {
+            var result = new InvalidValueException();
+            var message = result.Message;
+
+            StringAssert.Contains("InvalidValueException", message);
+        }
+
         /// <summary>
         /// Test method to ensure InvalidValueException with message throws correctly.
         /// </summary>