implicit & safer execution of PrepareRemoteExecutor

tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.cs

@@ -27,11 +27,6 @@ namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 
         private const float ProgressiveTolerance = 0.2F / 100;
 
-        static JpegDecoderTests()
-        {
-            TestEnvironment.PrepareRemoteExecutor();
-        }
-
         private static ImageComparer GetImageComparer<TPixel>(TestImageProvider<TPixel> provider)
             where TPixel : unmanaged, IPixel<TPixel>
         {

tests/ImageSharp.Tests/Memory/Allocators/ArrayPoolMemoryAllocatorTests.cs

@@ -28,11 +28,6 @@ namespace SixLabors.ImageSharp.Tests.Memory.Allocators
         /// </summary>
         private static MemoryAllocatorFixture StaticFixture { get; } = new MemoryAllocatorFixture();
 
-        static ArrayPoolMemoryAllocatorTests()
-        {
-            TestEnvironment.PrepareRemoteExecutor();
-        }
-
         public class BufferTests : BufferTestSuite
         {
             public BufferTests()

tests/ImageSharp.Tests/Processing/Processors/Convolution/BokehBlurTest.cs

@@ -19,11 +19,6 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Convolution
 {
     public class BokehBlurTest
     {
-        static BokehBlurTest()
-        {
-            TestEnvironment.PrepareRemoteExecutor();
-        }
-
         private static readonly string Components10x2 = @"
         [[ 0.00451261+0.0165137j   0.02161237-0.00299122j  0.00387479-0.02682816j
           -0.02752798-0.01788438j -0.03553877+0.0154543j  -0.01428268+0.04224722j

tests/ImageSharp.Tests/TestUtilities/Attributes/ImageDataAttributeBase.cs

@@ -18,6 +18,13 @@ namespace SixLabors.ImageSharp.Tests
 
         protected readonly PixelTypes PixelTypes;
 
+        static ImageDataAttributeBase()
+        {
+            // ImageDataAttributes are used in almost all tests, thus a good place to enforce the execution of
+            // TestEnvironment static constructor before anything else is done.
+            TestEnvironment.EnsureSharedInitializersDone();
+        }
+
         /// <summary>
         /// Initializes a new instance of the <see cref="ImageDataAttributeBase"/> class.
         /// </summary>

tests/ImageSharp.Tests/TestUtilities/TestEnvironment.cs

@@ -34,6 +34,11 @@ namespace SixLabors.ImageSharp.Tests
 
         private static readonly Lazy<string> NetCoreVersionLazy = new Lazy<string>(GetNetCoreVersion);
 
+        static TestEnvironment()
+        {
+            PrepareRemoteExecutor();
+        }
+
         /// <summary>
         /// Gets the .NET Core version, if running on .NET Core, otherwise returns an empty string.
         /// </summary>
@@ -111,6 +116,13 @@ namespace SixLabors.ImageSharp.Tests
 
         internal static bool IsFramework => string.IsNullOrEmpty(NetCoreVersion);
 
+        /// <summary>
+        /// A dummy operation to enforce the execution of the static constructor.
+        /// </summary>
+        internal static void EnsureSharedInitializersDone()
+        {
+        }
+
         /// <summary>
         /// Creates the image output directory.
         /// </summary>
@@ -141,7 +153,7 @@ namespace SixLabors.ImageSharp.Tests
         /// When running in 32 bits, enforces 32 bit execution of Microsoft.DotNet.RemoteExecutor.exe
         /// with the help of CorFlags.exe found in Windows SDK.
         /// </summary>
-        internal static void PrepareRemoteExecutor()
+        private static void PrepareRemoteExecutor()
         {
             if (!IsFramework)
             {
@@ -153,12 +165,11 @@ namespace SixLabors.ImageSharp.Tests
 
             if (File.Exists(remoteExecutorConfigPath))
             {
-                // already prepared
+                // Already initialized
                 return;
             }
 
             string testProjectConfigPath = TestAssemblyFile.FullName + ".config";
-
             File.Copy(testProjectConfigPath, remoteExecutorConfigPath);
 
             if (Is64BitProcess)
@@ -184,7 +195,17 @@ namespace SixLabors.ImageSharp.Tests
 
             string remoteExecutorPath = Path.Combine(TestAssemblyFile.DirectoryName, "Microsoft.DotNet.RemoteExecutor.exe");
 
-            string args = $"{remoteExecutorPath} /32Bit+ /Force";
+            string remoteExecutorTmpPath = $"{remoteExecutorPath}._tmp";
+
+            if (File.Exists(remoteExecutorTmpPath))
+            {
+                // Already initialized
+                return;
+            }
+
+            File.Copy(remoteExecutorPath, remoteExecutorTmpPath);
+
+            string args = $"{remoteExecutorTmpPath} /32Bit+ /Force";
 
             var si = new ProcessStartInfo()
             {
@@ -206,6 +227,9 @@ namespace SixLabors.ImageSharp.Tests
                     $@"Failed to run {si.FileName} {si.Arguments}:\n STDOUT: {standardOutput}\n STDERR: {standardError}");
             }
 
+            File.Delete(remoteExecutorPath);
+            File.Copy(remoteExecutorTmpPath, remoteExecutorPath);
+
             static FileInfo Find(DirectoryInfo root, string name)
             {
                 FileInfo fi = root.EnumerateFiles(name).FirstOrDefault();