CN-195 Verify CASE_UPDATE region after sample loading

[sumeetons]

Motivation and Context

Integrated Census services expect the region in outbound CASE_UPDATE payloads
to be a single country character even when RM receives and stores a more
specific region code such as E12000009.

• Context Index has been kept up to date

What has changed

Sample-load feature

• Added an observable assertion for the CASE_UPDATE payloads produced while
  loading the existing England sample.
• Verify every captured event against its source sample row, including case and
  address fields.
• Verify that each emitted region is exactly one character and equals the
  leading character of the full sample region.

Step definitions and context

• Reuse the events already captured by sample loading, avoiding a second Pub/Sub
  pull and preserving queue cleanup.
• Extracted source-row matching for reuse by setup and detailed assertions.
• Registered sample_rows in the Behave context index.

How to test?

With the local RM topology and Pub/Sub emulator running:

cd census31-rm-acceptance-tests
make lint
PUBSUB_EMULATOR_HOST=localhost:8538 \
  pipenv run behave acceptance_tests/features/load_sample.feature

Results: lint passed; 1 feature, 1 scenario, and 2 steps passed.

Links

• CN-195
• Production change: CN-195 Emit single-character region in CASE_UPDATE events census31-rm-case-processor#38

Screenshots (if appropriate):

N/A

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ BASH	shellcheck	1		0	0	0.19s
✅ MARKDOWN	markdownlint	2		0	0	0.42s

See detailed report in MegaLinter reports

[Copilot]

Copilot review overview

🟢 Approval recommended

All reviewed changes are covered by validation with no unresolved blocking issues.

Review effort: Lite
Findings: None

What changed in this PR

Adds acceptance validation for CASE_UPDATE payloads produced during sample loading, including source-row matching and single-character region formatting.

Changes:

• Stores sample rows in Behave context.
• Reuses captured events for detailed payload assertions.
• Documents the sample_rows context attribute.

File	Description
CODE_GUIDE.md	Documents sample_rows.
acceptance_tests/​features/​steps/​sample_loading.py	Matches emitted cases to sample rows and validates payload fields and regions.
acceptance_tests/​features/​load_sample.feature	Executes the new CASE_UPDATE validation step.

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[AdamHawtin]

LGTM 👍

[ravindra-tummuru]

I have removed my comment in favour of future improvement to this scenario as needed. For now I approve it as it is.