diff --git a/ImageCore.Tests/ImageCore.Tests.csproj b/ImageCore.Tests/ImageCore.Tests.csproj
index 4199998..586e233 100644
--- a/ImageCore.Tests/ImageCore.Tests.csproj
+++ b/ImageCore.Tests/ImageCore.Tests.csproj
@@ -7,8 +7,8 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4"/>
-        <PackageReference Include="xunit" Version="2.4.1"/>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
+        <PackageReference Include="xunit" Version="2.4.1" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
@@ -20,7 +20,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <ProjectReference Include="..\ImageCore\ImageCore.csproj"/>
+        <ProjectReference Include="..\ImageCore\ImageCore.csproj" />
     </ItemGroup>
 
 </Project>
diff --git a/ImageCore.Tests/TestCompressor.cs b/ImageCore.Tests/TestCompressor.cs
new file mode 100644
index 0000000..c9beda7
--- /dev/null
+++ b/ImageCore.Tests/TestCompressor.cs
@@ -0,0 +1,56 @@
+using System;
+using System.IO;
+using System.Security.Cryptography;
+using Image;
+using Xunit;
+
+namespace ImageCore.Tests
+{
+    public class TestLosslessCompressor
+    {
+        private readonly string _testsProjectDirectory;
+
+        public TestLosslessCompressor()
+        {
+            _testsProjectDirectory = Environment.GetEnvironmentVariable("IMAGE_CORE_TESTS");
+        }
+
+        [Fact]
+        public void TestLosslessCompressor_Compress()
+        {
+            ICompressor compressor = new LosslessCompressor();
+            var sourceFileName = Path.Join(_testsProjectDirectory, "test_pictures/IMG_0138.HEIC");
+            var destinationFileName = Path.GetTempFileName();
+            File.Copy(sourceFileName, destinationFileName, true);
+            compressor.Compress(destinationFileName);
+
+            var originalFile = File.Open(sourceFileName, FileMode.Open);
+            var compressedFile = File.Open(destinationFileName, FileMode.Open);
+            
+            Assert.True(compressedFile.Length <= originalFile.Length);
+            
+            originalFile.Close();
+            compressedFile.Close();
+            File.Delete(destinationFileName);
+        }
+        
+        [Fact]
+        public void TestNullCompressor_Compress()
+        {
+            ICompressor compressor = new NullCompressor();
+            var sourceFileName = Path.Join(_testsProjectDirectory, "test_pictures/IMG_0138.HEIC");
+            var destinationFileName = Path.GetTempFileName();
+            File.Copy(sourceFileName, destinationFileName, true);
+            compressor.Compress(destinationFileName);
+            
+            var originalFile = File.Open(sourceFileName, FileMode.Open);
+            var compressedFile = File.Open(destinationFileName, FileMode.Open);
+            
+            Assert.True(compressedFile.Length == originalFile.Length);
+            
+            originalFile.Close();
+            compressedFile.Close();
+            File.Delete(destinationFileName);
+        }
+    }
+}
\ No newline at end of file
diff --git a/ImgMetadataRemover.sln.DotSettings.user b/ImgMetadataRemover.sln.DotSettings.user
index 2a32d30..f219feb 100644
--- a/ImgMetadataRemover.sln.DotSettings.user
+++ b/ImgMetadataRemover.sln.DotSettings.user
@@ -4,7 +4,5 @@
   &lt;Assembly Path="C:\Users\nutiu\.nuget\packages\magick.net.core\8.6.1\lib\netstandard21\Magick.NET.Core.dll" /&gt;&#xD;
 &lt;/AssemblyExplorer&gt;</s:String>
 	<s:String x:Key="/Default/Environment/UnitTesting/UnitTestSessionStore/Sessions/=761234b5_002D46ba_002D4312_002Dab60_002Dd15d5d83a61a/@EntryIndexedValue">&lt;SessionState ContinuousTestingMode="0" IsActive="True" Name="TestGetFilenamesFromPath" xmlns="urn:schemas-jetbrains-com:jetbrains-ut-session"&gt;&#xD;
-  &lt;TestAncestor&gt;&#xD;
-    &lt;TestId&gt;xUnit::8EB81515-E62C-4408-84E0-6C27E0293902::net5.0::ImageCore.Tests.TestLocalSystemFilesRetriever.TestGetFilenamesFromPath&lt;/TestId&gt;&#xD;
-  &lt;/TestAncestor&gt;&#xD;
+  &lt;Project Location="C:\Users\nutiu\RiderProjects\ImgMetadataRemover\ImageCore.Tests" Presentation="&amp;lt;ImageCore.Tests&amp;gt;" /&gt;&#xD;
 &lt;/SessionState&gt;</s:String></wpf:ResourceDictionary>
\ No newline at end of file