diff --git a/tests/QPdfSharp.Tests/Assets/watermark.pdf b/tests/QPdfSharp.Tests/Assets/watermark.pdf
new file mode 100644
index 0000000..a6e08ec
Binary files /dev/null and b/tests/QPdfSharp.Tests/Assets/watermark.pdf differ
diff --git a/tests/QPdfSharp.Tests/QPdfSharp.Tests.csproj b/tests/QPdfSharp.Tests/QPdfSharp.Tests.csproj
index 747fa77..2941885 100644
--- a/tests/QPdfSharp.Tests/QPdfSharp.Tests.csproj
+++ b/tests/QPdfSharp.Tests/QPdfSharp.Tests.csproj
@@ -19,8 +19,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <None Update="Assets\grug.pdf" CopyToOutputDirectory="Always" />
-    <None Update="Assets\grug.json" CopyToOutputDirectory="Always" />
+    <None Update="Assets\*.*" CopyToOutputDirectory="Always" />
   </ItemGroup>
 
   <ItemGroup>