Joseph Doherty 2666a598ae Task #253 follow-up — fix test-all.ps1 StrictMode crash on missing JSON keys ...

Running `test-all.ps1` end-to-end with a partial sidecar (only modbus/
abcip/s7 populated, no focas/twincat/phase7) crashed:

    [FAIL] modbus runner crashed: The property 'opcUaUrl' cannot be
    found on this object. Verify that the property exists.

Root cause: `_common.ps1` sets `Set-StrictMode -Version 3.0`, which
turns missing-property access on PSCustomObject into a throw. Every
`$config.<driver>.<optional-field> ?? $default` and `if
($config.<missing-section>)` check is therefore unsafe against a
normal JSON where optional fields are omitted.

Fix: switch to `ConvertFrom-Json -AsHashtable` and add a `Get-Or`
helper. Hashtables tolerate `.ContainsKey()` / indexer access even
under StrictMode, so the per-driver sections now read:

    $modbus = Get-Or $config "modbus"
    if ($modbus) {
        ... -OpcUaUrl (Get-Or $modbus "opcUaUrl" $OpcUaUrl) ...
    }

Verified end-to-end with live docker-compose fixtures:
 - Modbus / AB CIP / S7 each run to completion, report 2/5 PASS (the
   driver-only stages) and FAIL the 3 server-bridge stages (expected —
   server-side factory wiring is blocked on #209).
 - The FINAL MATRIX header renders cleanly with SKIP rows for the
   drivers not present in the sidecar + FAIL rows for the present ones.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-21 10:55:15 -04:00

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