Reorganized structure.

Created test project.

WpfExtended.Test/App.xaml

@@ -0,0 +1,9 @@
+<Application x:Class="WpfExtended.Test.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:WpfExtended.Test"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

WpfExtended.Test/App.xaml.cs

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+using System.Windows;
+
+namespace WpfExtended.Test
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

WpfExtended.Test/MainWindow.xaml

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+<Window x:Class="WpfExtended.Test.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:WpfExtended.Test"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+
+    </Grid>
+</Window>

WpfExtended.Test/MainWindow.xaml.cs

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+using System.Windows;
+using System.Windows.Media;
+
+namespace WpfExtended.Test
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public static DependencyProperty ImageSourceProperty =
+            DependencyProperty.Register(nameof(ImageSource), typeof(ImageSource), typeof(MainWindow));
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}

WpfExtended.Test/Utilities/TypeCrawler.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows.Media.Effects;
+
+namespace WpfExtended.Tests.Utilities
+{
+    internal static class TypeCrawler
+    {
+        public static IEnumerable<Type> GetEffectTypes<T>()
+        {
+            return AppDomain.CurrentDomain.GetAssemblies()
+                .SelectMany(a => a.GetTypes()
+                    .Where(t => t.IsAssignableTo(typeof(T))));
+        }
+    }
+}

WpfExtended.Test/WpfExtended.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net5.0-windows</TargetFramework>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Update="Images\Test.jpg">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>