Update NUnit to 4.0.

NUnit 4.x only supports net6.0 and upwards. so change FsCheck.NUnit from netstandard2.0 to net6.0.

Directory.Packages.props

@@ -1,20 +1,20 @@
 <Project>
   <ItemGroup>
     <PackageVersion Include="FSharp.Core" Version="5.0.2" />
-    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="Microsoft.NETCore.Platforms" Version="5.0.2" />
     <PackageVersion Include="Microsoft.NETCore.Targets" Version="5.0" />
     <PackageVersion Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.3" />
     <PackageVersion Include="Microsoft.TestPlatform.ObjectModel" Version="16.11" />
-    <PackageVersion Include="MSTest.TestAdapter" Version="2.2.7" />
-    <PackageVersion Include="MSTest.TestFramework" Version="2.2.7" />
+    <PackageVersion Include="MSTest.TestAdapter" Version="3.7.0" />
+    <PackageVersion Include="MSTest.TestFramework" Version="3.7.0" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageVersion Include="NuGet.Frameworks" Version="5.11" />
-    <PackageVersion Include="NUnit" Version="[3.13.1,5.0.0)" />
-    <PackageVersion Include="NUnit3TestAdapter" Version="4.0" />
+    <PackageVersion Include="NUnit" Version="[4.0.0, 5.0.0)" />
+    <PackageVersion Include="NUnit3TestAdapter" Version="4.6.0" />
     <PackageVersion Include="System.Buffers" Version="4.5.1" />
     <PackageVersion Include="System.Collections" Version="4.3" />
-    <PackageVersion Include="System.Collections.Immutable" Version="8.0.0" />
+    <PackageVersion Include="System.Collections.Immutable" Version="9.0.0" />
     <PackageVersion Include="System.Diagnostics.Debug" Version="4.3" />
     <PackageVersion Include="System.Diagnostics.TextWriterTraceListener" Version="4.3" />
     <PackageVersion Include="System.Diagnostics.TraceSource" Version="4.3" />
@@ -39,4 +39,4 @@
     <PackageVersion Include="xunit.extensibility.execution" Version="[2.4.1, 3.0.0)" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.5.7" />
   </ItemGroup>
-</Project>
+</Project>

examples/FsCheck.NUnit.Examples/PropertyExamples.fs

@@ -43,7 +43,7 @@ type NUnitTest() =
 
     [<Property>]
     member __.PrintUnhandledException_ShouldFail (xs : int list) =
-        Assert.IsTrue(List.length xs < 6, "this message should be visible in test explorer")
+        Assert.That(List.length xs < 6, "this message should be visible in test explorer")
 
     [<Property; Ignore("reason")>]
     member __.ShouldIgnore (xs : int list) =

src/FsCheck.NUnit/FsCheck.NUnit.fsproj

@@ -2,7 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <AssemblyName>FsCheck.NUnit</AssemblyName>
-        <TargetFramework>netstandard2.0</TargetFramework>
+        <TargetFramework>net6.0</TargetFramework>
         <GenerateDocumentationFile>true</GenerateDocumentationFile>
         <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
         <PackageDescription>FsCheck.NUnit integrates FsCheck with NUnit by adding a PropertyAttribute that runs FsCheck tests, similar to NUnit TestAttribute.

src/FsCheck.NUnit/FsCheckPropertyAttribute.fs

@@ -260,7 +260,8 @@ and FsCheckTestMethod(mi : IMethodInfo, parentSuite : Test) =
 
     member private x.HandleException ex testResult failureSite =
         match ex with
-        | :? ThreadAbortException -> Thread.ResetAbort()
+        | :? ThreadAbortException -> () // old code called obsolete Thread.ResetAbort() which is no longer supported on net core and 5+ and above, but those won't ever throw ThreadAbortException either. 
+                                        // https://learn.microsoft.com/en-us/dotnet/api/system.threading.threadabortexception?view=net-8.0
         | _ -> ()
         testResult.RecordException(x.FilterException <| ex, failureSite)