Analyzers do not work with GlobalUsings

Description

When using global usings, analyzers no longer report any diagnostics.

Expected behavior:

Be able to use global usings, either:

• From a source file GlobalUsings.cs that contains:

  global using Xunit;
  global using FluentAssertions;
  

  with the next snippet in project file:

  <ItemGroup>
    <Compile Include="GlobalUsings.cs" />
  </ItemGroup>
  

• From project file directly:

  <ItemGroup>
    <Using Include="FluentAssertions" />
    <Using Include="Xunit" />
  </ItemGroup>
  

Versions

• Fluent Assertions: 6.7.0
• Fluent Assertions Analyzers: 0.17.2
• .NET 6

[bart-vmware]

Another source for inspiration: The Sonar analyzer for S2699: Tests should include assertions, which supports xUnit and FluentAssertions. These analyzers are widely-used and optimized for high performance in large codebases. Source code at https://github.com/SonarSource/sonar-dotnet/blob/18eb2f6d6c4655f8b259744ef210347d12ce8b94/analyzers/src/SonarAnalyzer.CSharp/Rules/TestMethodShouldContainAssertion.cs.

[bart-vmware]

Thanks for the fix, this is working correctly now.