chore: upgrade xunit from v2 to v3

src/Fable.Transforms/Rust/Fable2Rust.fs

@@ -6480,12 +6480,16 @@ module Compiler =
                 ModuleDepth = 0
             }
 
+        let entryPointItems = file.Declarations |> getEntryPointItems com ctx
+
         let topAttrs =
             [
                 if isLastFileInProject com then
                     // adds "no_std" to crate if feature is enabled
                     mkInnerAttr "cfg_attr" [ "feature = \"no_std\""; "no_std" ]
-                    mkInnerAttr "cfg_attr" [ "feature = \"no_std\""; "no_main" ]
+                    // Libraries retain Cargo's test-harness entry point.
+                    if not (List.isEmpty entryPointItems) then
+                        mkInnerAttr "cfg_attr" [ "feature = \"no_std\""; "no_main" ]
 
                     // TODO: make some of those conditional on compiler options
                     mkInnerAttr "allow" [ "dead_code" ]
@@ -6507,7 +6511,6 @@ module Compiler =
             // mkInnerAttr "feature" ["destructuring_assignment"]
             ]
 
-        let entryPointItems = file.Declarations |> getEntryPointItems com ctx
         let importItems = com.GetAllImports(ctx) |> transformImports com ctx
         let declItems = file.Declarations |> transformDeclarations com ctx
         let modItems = getModuleItems com ctx // global module imports

tests/Beam/Fable.Tests.Beam.fsproj

@@ -1,6 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
+    <!-- Exclude .NET-only xUnit runner sources during Fable project cracking. -->
+    <XunitAutoGeneratedEntryPoint Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitAutoGeneratedEntryPoint>
+    <XunitRegisterBuiltInRunnerReporters Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitRegisterBuiltInRunnerReporters>
+    <XunitRegisterBuiltInResultWriters Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitRegisterBuiltInResultWriters>
     <TargetFramework>net10.0</TargetFramework>
     <RollForward>Major</RollForward>
     <IsPackable>false</IsPackable>
@@ -10,8 +14,9 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
-    <PackageReference Include="XUnit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
+    <!-- Keep the existing VSTest-based dotnet test commands on .NET 10. -->
+    <PackageReference Include="xunit.v3.mtp-off" Version="4.0.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="4.0.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
@@ -24,6 +29,10 @@
     <ProjectReference Include="../../src/Fable.Core/Fable.Core.fsproj" />
     <ProjectReference Include="MemberNameCollisionLibrary/MemberNameCollisionLibrary.fsproj" />
   </ItemGroup>
+  <ItemGroup>
+    <!-- Temporary CI workaround for detached async assertions; remove once .NET tests await completion. -->
+    <Content Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
   <ItemGroup>
     <Compile Include="Misc/Aether.fs" />
     <Compile Include="Misc/Imports.fs" />
@@ -104,6 +113,5 @@
     <Compile Include="ModuleMutableTwoTests.fs" />
     <Compile Include="ModuleNamingTests.fs" />
     <Compile Include="MemberNamingTests.fs" />
-    <Compile Include="Main.fs" />
   </ItemGroup>
 </Project>

tests/Beam/xunit.runner.json

@@ -0,0 +1,5 @@
+{
+  "$schema": "https://xunit.net/schema/current/xunit.runner.schema.json",
+  "parallelizeTestCollections": false,
+  "maxParallelThreads": 1
+}

tests/Php/Fable.Tests.Php.fsproj

@@ -1,6 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
+    <!-- Exclude .NET-only xUnit runner sources during Fable project cracking. -->
+    <XunitAutoGeneratedEntryPoint Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitAutoGeneratedEntryPoint>
+    <XunitRegisterBuiltInRunnerReporters Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitRegisterBuiltInRunnerReporters>
+    <XunitRegisterBuiltInResultWriters Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitRegisterBuiltInResultWriters>
     <TargetFramework>net10.0</TargetFramework>
     <RollForward>Major</RollForward>
     <IsPackable>false</IsPackable>
@@ -9,8 +13,9 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.7.0" />
-    <PackageReference Include="XUnit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
+    <!-- Keep the existing VSTest-based dotnet test commands on .NET 10. -->
+    <PackageReference Include="xunit.v3.mtp-off" Version="4.0.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="4.0.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
@@ -31,7 +36,6 @@
     <Compile Include="TestUnionType.fs" />
     <Compile Include="TestLoops.fs" />
     <Compile Include="TestAsync.fs" />
-    <Compile Include="Main.fs" />
 
   </ItemGroup>
 </Project>

tests/Python/Fable.Tests.Python.fsproj

@@ -1,6 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
+    <!-- Exclude .NET-only xUnit runner sources during Fable project cracking. -->
+    <XunitAutoGeneratedEntryPoint Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitAutoGeneratedEntryPoint>
+    <XunitRegisterBuiltInRunnerReporters Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitRegisterBuiltInRunnerReporters>
+    <XunitRegisterBuiltInResultWriters Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitRegisterBuiltInResultWriters>
     <TargetFramework>net10.0</TargetFramework>
     <RollForward>Major</RollForward>
     <IsPackable>false</IsPackable>
@@ -10,8 +14,9 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
-    <PackageReference Include="XUnit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="4.0.0">
+    <!-- Keep the existing VSTest-based dotnet test commands on .NET 10. -->
+    <PackageReference Include="xunit.v3.mtp-off" Version="4.0.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="4.0.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
@@ -22,6 +27,10 @@
   <ItemGroup>
     <ProjectReference Include="../../src/Fable.Core/Fable.Core.fsproj" />
   </ItemGroup>
+  <ItemGroup>
+    <!-- Temporary Windows CI workaround; remove once .NET async tests await completion. -->
+    <Content Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
   <ItemGroup>
     <Compile Include="../Js/Main/Globs/*.fs" />
     <Compile Include="Util.fs" />
@@ -88,6 +97,5 @@
     <Compile Include="TestNonRegression.fs" />
     <Compile Include="TestQuotation.fs" />
     <Compile Include="TestInlineIfLambda.fs" />
-    <Compile Include="Main.fs" />
   </ItemGroup>
 </Project>

tests/Python/xunit.runner.json

@@ -0,0 +1,5 @@
+{
+  "$schema": "https://xunit.net/schema/current/xunit.runner.schema.json",
+  "parallelizeTestCollections": false,
+  "maxParallelThreads": 1
+}

tests/Rust/Fable.Tests.Rust.fsproj

@@ -1,5 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <!-- Exclude .NET-only xUnit runner sources during Fable project cracking. -->
+    <XunitAutoGeneratedEntryPoint Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitAutoGeneratedEntryPoint>
+    <XunitRegisterBuiltInRunnerReporters Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitRegisterBuiltInRunnerReporters>
+    <XunitRegisterBuiltInResultWriters Condition="'$(FABLE_COMPILER)' == 'True'">false</XunitRegisterBuiltInResultWriters>
     <TargetFramework>net10.0</TargetFramework>
     <RollForward>Major</RollForward>
     <IsPackable>false</IsPackable>
@@ -8,8 +13,9 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
-    <PackageReference Include="XUnit" Version="2.9.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="4.0.0">
+    <!-- Keep the existing VSTest-based dotnet test commands on .NET 10. -->
+    <PackageReference Include="xunit.v3.mtp-off" Version="4.0.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="4.0.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>

tests/Rust/tests/src/lib.fs

@@ -5,7 +5,3 @@ open Fable.Core.Rust
 let _imports() =
     importAll "./ExtInteropTests.rs"
     ()
-
-// Comment the main func when no longer needed (after migrating to xunit v3)
-[<EntryPoint>]
-let main _args = 0