Getting System.MissingMethodException: Method not found: 'Boolean EmptyFiles.FileExtensions.IsTextExtension(System.String)'.

[kl1mm]

Hey everyone,
I don't understand what I'm doing wrong, maybe someone can help me?
I always get this exception:
“System.MissingMethodException: Method not found: ‘Boolean EmptyFiles.FileExtensions.IsTextExtension(System.String)’.”.
when calling Verify(...)

I have already tried different VerifyTest.Xunit versions.
What have I overlooked?

[Fact]
public async Task TestIt()
{
    var target = new { Name = "name" };
        
    await Verify(target);
}    

[SimonCropp]

can you share the content of your csproj?

[kl1mm]

Sure, here we go:

Directory.Build.props

<Project>
  <PropertyGroup>
    <SomePath>$(SolutionDir)../xyz/$(Configuration)/</SomePath>
    <SomePath2>$(SomePath)abc/</SomePath2>
  </PropertyGroup>

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
    <NeutralLanguage>de</NeutralLanguage>
    <DebugType>embedded</DebugType>
    <Nullable>enable</Nullable>
    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
    <EnableNETAnalyzers>true</EnableNETAnalyzers>
    <AnalysisMode>AllEnabledByDefault</AnalysisMode>
    <ImplicitUsings>true</ImplicitUsings>
    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
    <ProjectCapability Include="ConfigurableFileNesting"/>
    <ProjectCapability Include="ConfigurableFileNestingFeatureEnabled"/>
  </ItemGroup>
</Project>

Test.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <IsPackable>false</IsPackable>
    <IsTestProject>true</IsTestProject>
    <NoWarn>$(NoWarn);CA1707;CA1062</NoWarn>
    <Optimize>false</Optimize>
    <DebugType>Full</DebugType>
  </PropertyGroup>

  <ItemGroup>
    <Using Include="Xunit"/>
    <Using Include="Shouldly"/>
    <Using Include="NSubstitute"/>
  </ItemGroup>

  <ItemGroup>
    <FrameworkReference Include="Microsoft.AspNetCore.App"/>
  </ItemGroup>  

  <ItemGroup>
    <PackageReference Include="Company.Internal.Package"/>
    <PackageReference Include="coverlet.collector"/>
    <PackageReference Include="Microsoft.NET.Test.Sdk"/>
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing"/>
    <PackageReference Include="NSubstitute"/>
    <PackageReference Include="Shouldly"/>
    <PackageReference Include="Verify.Xunit"/>
    <PackageReference Include="xunit"/>
    <PackageReference Include="xunit.runner.visualstudio">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\..\src\Company.Internal1.csproj" />
    <ProjectReference Include="..\..\src\Company.Internal2.csproj" />
  </ItemGroup>

  <ItemGroup>
    <None Update="somejsonfile.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
  </ItemGroup>  
</Project>

[SimonCropp]

can u add your package version file

[kl1mm]

Directory.Packages.props

<Project>
  <PropertyGroup>
    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
  </PropertyGroup>
  <ItemGroup Label="Company">
    <PackageVersion Include="Company.Internal" Version="1.1.1" />
    ... more comapny Internals
  </ItemGroup>
  <ItemGroup Label="3rd Party">
    <PackageVersion Include="Refit" Version="7.0.0" />
    <PackageVersion Include="StronglyTypedId" Version="1.0.0-beta07" />
    <PackageVersion Include="StronglyTypedId.Templates" Version="1.0.0-beta07" />
    <PackageVersion Include="kli.Localize" Version="0.8.3" />
    <PackageVersion Include="Radzen.Blazor" Version="4.32.1" />
    <PackageVersion Include="Riok.Mapperly" Version="3.5.1" />
    <PackageVersion Include="Microsoft.AspNetCore.Components.WebAssembly" Version="8.0.3" />
    <PackageVersion Include="Microsoft.AspNetCore.Components.WebAssembly.Server" Version="8.0.3" />
    <PackageVersion Include="Microsoft.SourceLink.AzureRepos.Git" Version="8.0.0" />
    <PackageVersion Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="8.0.4" />
    <PackageVersion Include="Microsoft.AspNetCore.Identity.EntityFrameworkCore" Version="8.0.5" />
    <PackageVersion Include="Microsoft.EntityFrameworkCore.Abstractions" Version="8.0.4" />
    <PackageVersion Include="Microsoft.EntityFrameworkCore" Version="8.0.5" />
    <PackageVersion Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.5" />
    <PackageVersion Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.5" />
    <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.5" />
    <PackageVersion Include="Microsoft.IdentityModel.JsonWebTokens" Version="7.5.1" />
    <PackageVersion Include="Microsoft.Extensions.Identity.Core" Version="8.0.5" />
    <PackageVersion Include="Microsoft.Extensions.Identity.Stores" Version="8.0.5" />
    <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.9.2" />
  </ItemGroup>
  <ItemGroup Label="Tests">
    <PackageVersion Include="coverlet.collector" Version="6.0.2">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageVersion>
    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.5" />
    <PackageVersion Include="NetArchTest.Rules" Version="1.3.2" />
    <PackageVersion Include="NSubstitute" Version="5.1.0" />
    <PackageVersion Include="Shouldly" Version="4.2.1" />
    <PackageVersion Include="Verify.Xunit" Version="24.3.0-beta.4" />
    <PackageVersion Include="xunit" Version="2.8.1" />
    <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.1">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageVersion>
  </ItemGroup>
  <ItemGroup Label="Versioning">
    <GlobalPackageReference Include="Nerdbank.GitVersioning" Version="3.6.133">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </GlobalPackageReference>
  </ItemGroup>
</Project>

[SimonCropp]

this is because shouldy is using a 12 month old version of EmptyFiles.

i suspect you would have some package downgrade warnings when you build?

can you try adding an explicit reference to https://www.nuget.org/packages/DiffEngine and https://www.nuget.org/packages/EmptyFiles/

[kl1mm]

Thanks @SimonCropp,
your hint helped to fix it.