Use .NET 9 SDK, update unit tests

Author: teo-tsirpanis

Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <LangVersion>12.0</LangVersion>
+    <LangVersion>13.0</LangVersion>
     <Nullable>enable</Nullable>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
 

global.json

@@ -1,7 +1,7 @@
 {
   "sdk": {
-    "version": "8.0.100",
+    "version": "9.0.100",
     "rollForward": "latestFeature",
     "allowPrerelease": false
   }
-}
+}

tests/PolySharp.Tests/LanguageFeatures.cs

@@ -162,11 +162,18 @@ public static ReadOnlySpan<int> TestRange(ReadOnlySpan<int> numbers)
 [CollectionBuilder(typeof(CollectionClass), nameof(Create))]
 internal class CollectionClass : IEnumerable<int>
 {
-    public CollectionClass Test()
+    public static CollectionClass Test()
     {
+        Test2(1, 2, 3);
+
         return [1, 2, 3];
     }
 
+    public static void Test2(params CollectionClass collection)
+    {
+
+    }
+
     public static CollectionClass Create(ReadOnlySpan<int> values)
     {
         return new();
@@ -260,4 +267,22 @@ public void Start<TStateMachine>(ref TStateMachine stateMachine)
     }
 }
 
-#endif
+#endif
+
+internal static class OverloadResolutionPriorityTests
+{
+    public static void Test()
+    {
+        TestOverload(1);
+    }
+
+    [Obsolete("Do not use", error: true)]
+    [OverloadResolutionPriority(-1)]
+    public static void TestOverload(int x)
+    {
+    }
+
+    public static void TestOverload(int x, int y = 0)
+    {
+    }
+}

tests/PolySharp.Tests/PolySharp.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net472;net48;netstandard2.0;netstandard2.1;net6.0;net7.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net472;net48;netstandard2.0;netstandard2.1;net6.0;net7.0;net8.0;net9.0</TargetFrameworks>
     <PolySharpIncludeRuntimeSupportedAttributes>true</PolySharpIncludeRuntimeSupportedAttributes>
   </PropertyGroup>