fix expected value running on .NET Framework

Author: smdn

tests/Smdn.Reflection.ReverseGenerating/Smdn.Reflection.ReverseGenerating.Tests.csproj

@@ -11,5 +11,14 @@ SPDX-License-Identifier: MIT
 
   <ItemGroup>
     <ProjectReference Include="..\..\src\Smdn.Reflection.ReverseGenerating\Smdn.Reflection.ReverseGenerating.csproj" />
+    <PackageReference
+      Include="System.Runtime.InteropServices.RuntimeInformation"
+      Version="4.3.0"
+      Condition = "(
+        $(TargetFramework.StartsWith('net45')) or
+        $(TargetFramework.StartsWith('net46')) or
+        $(TargetFramework.StartsWith('net47'))
+      )"
+    />
   </ItemGroup>
 </Project>

tests/Smdn.Reflection.ReverseGenerating/Smdn.Reflection.ReverseGenerating/Generator.Attributes.cs

@@ -46,7 +46,25 @@ class AttributeTargetsMember {
 
         class AttributeTargetsReturnValue {
 #if NETFRAMEWORK
-          [return: AttributeTestCase("[return: System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.Bool)]")]
+          static string M0_ExpectedResult =>
+            RuntimeInformation.FrameworkDescription.StartsWith(".NET Framework", StringComparison.Ordinal)
+              ? "[return: System.Runtime.InteropServices.MarshalAs(" +
+                "System.Runtime.InteropServices.UnmanagedType.Bool, "+
+                "ArraySubType = default(System.Runtime.InteropServices.UnmanagedType), " +
+                "SizeParamIndex = 0, " +
+                "SizeConst = 0, " +
+                "IidParameterIndex = 0, " +
+                "SafeArraySubType = System.Runtime.InteropServices.VarEnum.VT_EMPTY" +
+                ")]"
+              : "[return: System.Runtime.InteropServices.MarshalAs(" +
+                "System.Runtime.InteropServices.UnmanagedType.Bool)" +
+                "]";
+
+          [return: AttributeTestCase(
+            expected: null,
+            ExpectedValueGeneratorType = typeof(AttributeTargetsReturnValue),
+            ExpectedValueGeneratorMemberName = nameof(M0_ExpectedResult)
+          )]
           [return: MarshalAs(UnmanagedType.Bool)]
           public bool M0() => throw new NotImplementedException();
 #endif