[Alexander Holstrup (aholstrup1)]

❔What, Why & How

A single dependency read from JSON can become a scalar string. BCContainerHelper interprets string inputs as comma-separated lists, splitting valid filenames such as Example Publisher, LLC_Core_1.0.0.0.app into two missing paths.

Cast installApps and installTestApps to [string[]] at the Run-AlPipeline call boundary. This preserves arrays or null, including after the test-app marker transformation.

Download Project Dependencies also checks resolved files using Test-Path -LiteralPath -PathType Leaf before writing its output lists. Missing files and check exceptions produce warnings with the full path; checks continue and outputs remain unchanged. This is diagnostic only and does not change BCContainerHelper's separate failed-path comma-splitting fallback.

Related to issue: #2398

Fixes: #2398

Validation: Invoke-Pester -Path .\Tests\DownloadProjectDependencies.Test.ps1 -Output Minimal -PassThru passed with 59 tests on PowerShell 7. Coverage includes literal filenames, test-app markers, missing files, and non-blocking check exceptions. Final changes have not been tested on Linux or rerun on Windows PowerShell 5.1.

✅ Checklist

• Add tests (E2E, unit tests)
• Update RELEASENOTES.md
• Update documentation (e.g. for new settings or scenarios)
• Add telemetry

[Copilot]

🟡 Changes recommended

The core array-casting regression lacks coverage, and exception diagnostics report marker-wrapped test-app paths.

2 open findings

• Add action-level regression test for comma-containing string[] parameters · New
• Report the stripped file path in parenthesized test app exceptions · New

What changed in this PR

Fixes comma-containing dependency filenames by preserving array semantics and adding path diagnostics.

Changes:

• Casts dependency inputs to string[] before Run-AlPipeline.
• Warns about missing or inaccessible resolved dependencies.
• Adds tests and release notes.

File	Description
Actions/​RunPipeline/​RunPipeline.ps1	Preserves dependency arrays at the pipeline boundary.
Actions/​DownloadProjectDependencies/​DownloadProjectDependencies.psm1	Adds dependency-file validation warnings.
Actions/​DownloadProjectDependencies/​DownloadProjectDependencies.Action.ps1	Invokes dependency validation.
Tests/​DownloadProjectDependencies.Test.ps1	Tests validation behavior and literal paths.
RELEASENOTES.md	Documents the fix.

🧠 Review effort: Balanced

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