WS-NA: Temporal Migration (PR 1: Adds test coverage)

[Isabella-Mitchell]

Resolves JIRA: WS-NA - 10% time. See plan

Summary

Increases test coverage for edge cases and timezones in preparation for migrating the psammead-timestamp-container from moment to temporal.

Code changes

src/app/legacy/containers/ArticleTimestamp

• Adds formatTimestamp helper function used by new edge case tests
• Adds edge case tests (for example - Daylight Saving Time)
• Adds Chromatic story for some edge cases, and general timezone and locales (disabled on storybook)

src/app/legacy/psammead/psammead-timestamp-container/src/utilities/index.test.js

• Added cleanup so moment.now is reset after tests.
• Adds more timezone and locale coverage to formatUnixTimestamp tests

src/app/lib/config/services/azeri.ts

• fixes typo (was accepted by Moment but won't be by Temporal)

Testing

1. Unit tests pass

Useful Links

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[Isabella-Mitchell]

Note, uses default locale since other tests in this file use this

[Isabella-Mitchell]

Note, gets datetimeLocale and timezone from the service config (similar to the other tests above)

[Copilot]

Pull request overview

Adds additional timestamp edge-case coverage (DST boundaries, offset timezones, and non‑Latin locales) to de-risk the upcoming migration from Moment.js to Temporal, plus a small service timezone fix.

Changes:

• Expanded formatUnixTimestamp unit tests to cover DST transitions, unusual offsets, and non‑Latin locale formatting.
• Added ArticleTimestamp edge-case tests and a Chromatic-only story to visually validate timezone/locale output across services.
• Corrected Azeri timezone identifier casing (Asia/Baku) to align with stricter IANA validation.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/app/lib/config/services/azeri.ts	Fixes timezone identifier casing for Azeri service config.
src/app/legacy/psammead/psammead-timestamp-container/src/utilities/index.test.js	Adds broader timezone/locale test coverage and attempts to improve cleanup of mocked time sources.
src/app/legacy/containers/ArticleTimestamp/timeFormatTests/timeFormat.test.js	Adds deterministic edge-case timestamp formatting assertions (DST/offsets).
src/app/legacy/containers/ArticleTimestamp/timeFormatTests/testUtils.js	Introduces a helper to format arbitrary timestamps for edge-case tests without fixtures.
src/app/legacy/containers/ArticleTimestamp/timeFormatTests/README.md	Clarifies DST wording in documentation.
src/app/legacy/containers/ArticleTimestamp/index.stories.jsx	Adds a Chromatic-only multi-service timezone/locale comparison story.