Linux tests fail in AppDataStorage via Semantics.Paths validation

[matt-edmondson]

Summary

Test on ubuntu-latest fails on main. Every test in AppDataBatchManagerTests throws before reaching its assertion:

System.FormatException: Cannot convert "ktsu.BlastMerge.Test" to RelativeDirectoryPath
  at ktsu.AppDataStorage.AppData.get_AppDomain()
  at ktsu.AppDataStorage.AppData.get_Path()
  at ktsu.AppDataStorage.AppData`1.LoadOrCreate()
  at ktsu.BlastMerge.Services.AppDataBatchManager.get_AppData()

Windows passes.

There is nothing to fix here

The defect is in ktsu.Semantics.Paths, reached through ktsu.AppDataStorage. IsDirectoryPathAttribute validates a path by calling File.Exists, which for a relative path resolves against the current working directory. On Linux, .NET publishes an extensionless apphost named exactly ktsu.BlastMerge.Test beside the test assembly, so the check finds that file and rejects the name. On Windows the apphost is ktsu.BlastMerge.Test.exe, so it does not.

The name is identical on both platforms. Only what is on disk beside the process differs.

Tracked upstream: ktsu-dev/Semantics#196.

What unblocks it

A released ktsu.Semantics.Paths carrying that fix, then picking it up here. No change to this repository is expected to be needed, and it is worth re-checking rather than assuming once the dependency moves.

Verified

Cloned at main, ran the suite on Linux and on Windows. The only Linux failures are the ones above, all with the same cause.

[matt-edmondson]

Triage

Priority: High Effort: Small

What needs to be done: Nothing in this repo — the root cause is confirmed upstream in ktsu.Semantics.Paths (IsDirectoryPathAttribute validating via File.Exists, which collides with Linux's extensionless apphost sharing the test assembly's name). This is High priority because it currently breaks CI test signal on every Linux run, even though the fix itself is a small "bump the dependency and re-verify" once available.

Suggested next steps / acceptance criteria:

• Track IsDirectoryPathAttribute validates a relative path against the working directory Semantics#196 for the upstream fix
• Once a ktsu.Semantics.Paths release ships the fix, bump the dependency here and re-run the Linux suite to confirm
• No source changes expected in BlastMerge itself

Blockers / dependencies: Blocked on ktsu-dev/Semantics#196 (upstream). Cannot be resolved independently in this repo.

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