如何在Roslyn分析器测试中引用本地程序集并解决版本冲突

问题背景 #

我正在开发Roslyn分析器，用于检查框架代码中特性的使用情况，相关项目结构及代码示例如下：

Framework.csproj（定义特性） #

public class ModuleAttribute : Attribute { }

Framework.Analyzer.csproj（分析器实现） #

[DiagnosticAnalyzer(LanguageNames.CSharp)]
public class IsModuleAPublicClassAnalyzer : DiagnosticAnalyzer
{ ... }

Framework.Analyzer.Test.csproj（测试代码） #

[Fact]
public async Task MyTestMethod()
{
    string test = @"
using Framework;

namespace MyNamespace;

[Module]
public class MyConcreteModule
{
}
";

    DiagnosticResult expected = VerifyCs
        .Diagnostic(AsyncPropertySetterAnalyzer.DiagnosticId)
        .WithLocation(line: 6, column: 0);

    await new CSharpAnalyzerTest<IsModuleAPublicClassAnalyzer, XUnitVerifier>
    {
        TestState =
        {
            Sources = { test  },
            ExpectedDiagnostics = { expected }
        }
    }
    .RunAsync();
}

所有项目均位于同一解决方案中，请问如何在测试代码的代码片段里引用Framework.dll？

更新1：添加MetadataReference后的版本冲突问题 #

我尝试通过添加额外的MetadataReference来引用Framework.dll，修改后的测试代码如下：

[Fact]
public async Task MyTestMethod()
{
    string test = @"
using Framework;

namespace MyNamespace;

[Module]
public class MyConcreteModule
{
}
";

    DiagnosticResult expected = VerifyCs
        .Diagnostic(AsyncPropertySetterAnalyzer.DiagnosticId)
        .WithLocation(line: 6, column: 0);

    await new CSharpAnalyzerTest<IsModuleAPublicClassAnalyzer, XUnitVerifier>
    {
        TestState =
        {
            Sources = { test  },
            ExpectedDiagnostics = { expected },
            AdditionalReferences =
            {
                MetadataReference.CreateFromFile(typeof(ModuleAttribute).Assembly.Location)
            }
        }
    }
    .RunAsync();
}

但此时出现编译错误：

error CS1705: Assembly 'Framework' with identity 'Framework, Version=1.0.0.0, Culture=neutral, PublicKeyToken=29fe1ef4929b04aa' uses 'System.Runtime, Version=7.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Runtime' with identity 'System.Runtime, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'

项目目标框架信息：

• Framework.csproj：net7.0
• Framework.Analyzer.Test.csproj：net7.0
• Framework.Analyzer.csproj：netstandard2.0

内容的提问来源于stack exchange，提问作者JakobFerdinand