DOTNET_ROLL_FORWARD=Major should work

Author: bodewig

appveyor.yml

@@ -3,10 +3,14 @@ version: 2.10.1.{build}
 image:
   - Ubuntu2204
   - Visual Studio 2013
+  - Visual Studio 2017
   - Visual Studio 2022
 
 skip_tags: true
 
+environment:
+  DOTNET_ROLL_FORWARD: Major
+
 for:
   - matrix:
       only:
@@ -24,6 +28,7 @@ for:
 
   - matrix:
       only:
+        - image: Visual Studio 2017
         - image: Visual Studio 2022
         - image: Ubuntu2204
     before_build:

src/tests/net-constraints-nunit3/XMLUnit.NUnit3.Constraints.Test.csproj

@@ -16,7 +16,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup Label="Build">
-    <TargetFrameworks>net8.0</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.0</TargetFrameworks>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>
 

src/tests/net-core/XMLUnit.Core.Tests.csproj

@@ -16,7 +16,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup Label="Build">
-    <TargetFrameworks>net8.0</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.0</TargetFrameworks>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>
 

src/tests/net-placeholders/XMLUnit.Placeholders.Tests.csproj

@@ -16,7 +16,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup Label="Build">
-    <TargetFrameworks>net8.0</TargetFrameworks>
+    <TargetFrameworks>netcoreapp2.0</TargetFrameworks>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>