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Migrate in-memory assembly generation in the tests to run on all runtimes #5131
Description
Some of the NUnits tests use System.CodeDom to compile an in-memory assembly for the purpose of testing assembly-level attributes. This only works on .NET Framework. Roslyn is suggested for new development and is cross-platform. We should look into moving towards the Roslyn APIs for in-memory dynamic assembly generation in the tests and to try to get those tests running against all our targeted runtimes.
Activity
[-]Migrate in-memory assembly generation in the tests from using System.CodeDom to using Roslyn[/-][+]Migrate in-memory assembly generation in the tests from using System.CodeDom to using Roslyn APIs[/+][-]Migrate in-memory assembly generation in the tests from using System.CodeDom to using Roslyn APIs[/-][+]Migrate in-memory assembly generation in the tests to run on all runtimes[/+]stevenaw commentedon Feb 20, 2026
NOTE: I had tried to just "do this" as part of #5125 but found I struggled with dependency issues at the time and wanted to move on to testing the new attribute itself
manfred-brands commentedon Feb 25, 2026
Yes, you should not combine unrelated changes in on PR.
I have asked Copilot to convert System.CodeDom to Roslyn.
With some tweaking it seems to work.