diff --git a/src/Test/BouncyHsm.Pkcs11IntegrationTests/AssemblyTestConstants.cs b/src/Test/BouncyHsm.Pkcs11IntegrationTests/AssemblyTestConstants.cs
index 9df6534..b41c11b 100644
--- a/src/Test/BouncyHsm.Pkcs11IntegrationTests/AssemblyTestConstants.cs
+++ b/src/Test/BouncyHsm.Pkcs11IntegrationTests/AssemblyTestConstants.cs
@@ -1,8 +1,26 @@
-namespace BouncyHsm.Pkcs11IntegrationTests;
+using System.Runtime.InteropServices;
+
+namespace BouncyHsm.Pkcs11IntegrationTests;
 
 internal static class AssemblyTestConstants
 {
-    public const string P11LibPath = "BouncyHsm.Pkcs11Lib.dll";
+    public static string P11LibPath
+    {
+        get
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                return "BouncyHsm.Pkcs11Lib.dll";
+            }
+
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                return "BouncyHsm.Pkcs11Lib-x64.so";
+            }
+
+            throw new PlatformNotSupportedException();
+        }
+    }
 
     public const string UserPin = "123456";
 
diff --git a/src/Test/BouncyHsm.Pkcs11IntegrationTests/BouncyHsm.Pkcs11IntegrationTests.csproj b/src/Test/BouncyHsm.Pkcs11IntegrationTests/BouncyHsm.Pkcs11IntegrationTests.csproj
index 1bec876..50f83da 100644
--- a/src/Test/BouncyHsm.Pkcs11IntegrationTests/BouncyHsm.Pkcs11IntegrationTests.csproj
+++ b/src/Test/BouncyHsm.Pkcs11IntegrationTests/BouncyHsm.Pkcs11IntegrationTests.csproj
@@ -18,11 +18,18 @@
     <PackageReference Include="PkcsExtensions" Version="1.2.2" />
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="Exists('../../x64/Debug/BouncyHsm.Pkcs11Lib.dll')">
     <None Include="../../x64/Debug/BouncyHsm.Pkcs11Lib.dll">
       <Link>%(Filename)%(Extension)</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>
 
+  <ItemGroup Condition="Exists('../../../build_linux/BouncyHsm.Pkcs11Lib-x64.so')">
+    <None Include="../../build_linux/BouncyHsm.Pkcs11Lib-x64.so">
+      <Link>%(Filename)%(Extension)</Link>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>
diff --git a/src/Test/BouncyHsm.Pkcs11IntegrationTests/ReadMe.md b/src/Test/BouncyHsm.Pkcs11IntegrationTests/ReadMe.md
index 643565d..227de50 100644
--- a/src/Test/BouncyHsm.Pkcs11IntegrationTests/ReadMe.md
+++ b/src/Test/BouncyHsm.Pkcs11IntegrationTests/ReadMe.md
@@ -1,6 +1,10 @@
 ## How to run unit test
 
-1. Create empty slot if not exists with following parameters:
+1. Build native library
+  1.1 On WIndows using Vusial Studio
+  1.2 On Debian/Ubuntu use makefile
+2. Run Bouncy Hsm on localhost.
+3. Create empty slot if not exists with following parameters:
 
 ```json
 {
@@ -19,5 +23,8 @@
 }
 ```
 
-2. Run Bouncy Hsm on localhost.
-3. Run tests.
\ No newline at end of file
+3. Run tests using:
+```
+  dotnet clean
+  dotnet test
+```