From cbba63c3d8365f594ca3750a505c5f52416bb4db Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@lemstra.org>
Date: Fri, 10 Jan 2025 18:03:00 +0100
Subject: [PATCH] Make sure the Setup of the AppBuilder is only done once.

---
 .../AppBuilderHelper.cs                       | 40 +++++++++++++++++++
 .../TheToWriteableBitmapMethod.cs             |  5 +--
 .../TheToWriteableBitmapWithDensityMethod.cs  |  5 +--
 3 files changed, 42 insertions(+), 8 deletions(-)
 create mode 100644 tests/Magick.NET.AvaloniaMediaImaging.Tests/AppBuilderHelper.cs

diff --git a/tests/Magick.NET.AvaloniaMediaImaging.Tests/AppBuilderHelper.cs b/tests/Magick.NET.AvaloniaMediaImaging.Tests/AppBuilderHelper.cs
new file mode 100644
index 0000000000..d42cecd5f2
--- /dev/null
+++ b/tests/Magick.NET.AvaloniaMediaImaging.Tests/AppBuilderHelper.cs
@@ -0,0 +1,40 @@
+// Copyright Dirk Lemstra https://github.com/dlemstra/Magick.NET.
+// Licensed under the Apache License, Version 2.0.
+
+using System.Threading;
+using Avalonia;
+
+namespace Magick.NET.AvaloniaMediaImaging.Tests
+{
+    internal static class AppBuilderHelper
+    {
+        private static readonly SemaphoreSlim _lock = new(1);
+        private static bool _setupDone;
+
+        public static void Setup()
+        {
+            if (_setupDone)
+                return;
+
+            _lock.Wait();
+
+            try
+            {
+
+                if (_setupDone)
+                    return;
+
+                _setupDone = true;
+
+                AppBuilder
+                    .Configure<Application>()
+                    .UsePlatformDetect()
+                    .SetupWithoutStarting();
+            }
+            finally
+            {
+                _lock.Release();
+            }
+        }
+    }
+}
diff --git a/tests/Magick.NET.AvaloniaMediaImaging.Tests/IMagickImageExtentionsTests/TheToWriteableBitmapMethod.cs b/tests/Magick.NET.AvaloniaMediaImaging.Tests/IMagickImageExtentionsTests/TheToWriteableBitmapMethod.cs
index 6d4a32766f..cd8120e71a 100644
--- a/tests/Magick.NET.AvaloniaMediaImaging.Tests/IMagickImageExtentionsTests/TheToWriteableBitmapMethod.cs
+++ b/tests/Magick.NET.AvaloniaMediaImaging.Tests/IMagickImageExtentionsTests/TheToWriteableBitmapMethod.cs
@@ -15,10 +15,7 @@ public class TheToWriteableBitmapMethod
         [Fact]
         public void ShouldReturnWriteableBitmap()
         {
-            AppBuilder
-                .Configure<Application>()
-                .UsePlatformDetect()
-                .SetupWithoutStarting();
+            AppBuilderHelper.Setup();
 
             using var input = new MagickImage(Files.MagickNETIconPNG);
             using var bitmap = input.ToWriteableBitmap();
diff --git a/tests/Magick.NET.AvaloniaMediaImaging.Tests/IMagickImageExtentionsTests/TheToWriteableBitmapWithDensityMethod.cs b/tests/Magick.NET.AvaloniaMediaImaging.Tests/IMagickImageExtentionsTests/TheToWriteableBitmapWithDensityMethod.cs
index 099d1d99db..1477bbf7ae 100644
--- a/tests/Magick.NET.AvaloniaMediaImaging.Tests/IMagickImageExtentionsTests/TheToWriteableBitmapWithDensityMethod.cs
+++ b/tests/Magick.NET.AvaloniaMediaImaging.Tests/IMagickImageExtentionsTests/TheToWriteableBitmapWithDensityMethod.cs
@@ -15,10 +15,7 @@ public class TheToWriteableBitmapWithDensityMethod
         [Fact]
         public void ShouldReturnWriteableBitmap()
         {
-            AppBuilder
-                .Configure<Application>()
-                .UsePlatformDetect()
-                .SetupWithoutStarting();
+            AppBuilderHelper.Setup();
 
             using var input = new MagickImage(Files.MagickNETIconPNG);
             input.Density = new Density(150, 300);