Switch to C# version 14

Author: CharliePoole

build.cake

@@ -1,6 +1,7 @@
 // Load the recipe
 #load nuget:?package=NUnit.Cake.Recipe&version=1.6.0-alpha.8
 // Comment out above line and uncomment below for local tests of recipe changes
+//#load ../NUnit.Cake.Recipe/recipe/*.cs
 //#load ../NUnit.Cake.Recipe/recipe/*.cake
 
 // Load additional cake files

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "9.0.100",
+    "version": "10.0.100",
     "rollForward": "latestFeature"
   }
 }

src/Directory.Build.props

@@ -3,7 +3,7 @@
 
     <PropertyGroup>
         <!-- Compile and Build Settings -->
-        <LangVersion>12</LangVersion>
+        <LangVersion>14</LangVersion>
         <Features>strict</Features>
         <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
         <EnableNETAnalyzers>true</EnableNETAnalyzers>

src/NUnitEngine/nunit.engine/Services/RuntimeFrameworkService.cs

@@ -112,7 +112,6 @@ private static bool RuntimesMatch(Runtime requested, Runtime available)
         /// and a string representing the selected runtime is returned.
         /// </summary>
         /// <param name="package">A TestPackage representing an assembly</param>
-        /// <returns>A string representing the selected RuntimeFramework</returns>
         public void SelectRuntimeFramework(TestPackage package)
         {
             Guard.ArgumentValid(!package.HasSubPackages,

src/TestData/mock-assembly/mock-assembly.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <RootNamespace>NUnit.TestData</RootNamespace>
-    <TargetFrameworks>net35;net462;netcoreapp3.1;net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
+    <TargetFrameworks>net35;net462;netcoreapp3.1;net6.0;net7.0;net8.0;net9.0;net10.0</TargetFrameworks>
     <OutputPath>../../../bin/$(Configuration)/testdata</OutputPath>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\nunit.snk</AssemblyOriginatorKeyFile>
@@ -15,7 +15,7 @@
     <Description>Assembly used in testing the engine</Description>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'=='net462' OR '$(TargetFramework)'=='net6.0' OR '$(TargetFramework)'=='net7.0' OR '$(TargetFramework)'=='net8.0' OR '$(TargetFramework)'=='net9.0'">
+  <ItemGroup Condition="'$(TargetFramework)'=='net462' OR '$(TargetFramework)'=='net6.0' OR '$(TargetFramework)'=='net7.0' OR '$(TargetFramework)'=='net8.0' OR '$(TargetFramework)'=='net9.0' OR '$(TargetFramework)'=='net10.0'" >
     <PackageReference Include="NUnit" Version="4.3.2" />
     <PackageReference Include="NUnitLite" Version="4.3.2" />
   </ItemGroup>