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Akka.TestKit is the family convention for non-end-to-end Akka testing and would be the right tool here, but Akka.TestKit.Xunit2 is xunit-v2-only and this project is on xunit.v3 - adding it produces CS0433 type conflicts. Directory.Packages.props already documents the same constraint for the three projects deliberately held on xunit v2 for TestKit. Revisit when Akka ships an xunit.v3 TestKit.