[Test Improver] Add unit tests for addReleaseNotesNotification utility

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🤖 Test Improver — automated AI assistant

Goal and Rationale

shell/utils/release-notes.ts contains addReleaseNotesNotification, an async function that manages "What's New" release-note notifications in the Rancher Notification Centre. It had zero test coverage despite containing several meaningful branches:

Branch	Description
found = true	Current-version notification already in store — skip add
lastReadVersion === rancherVersion	User already read this version — skip add
Old-prefix notification	Dispatch notifications/remove for stale entries
Prefix match + old version	Remove old, then add current
Version suffix stripping	2.11.0-rc1 → 2.11.0 via .split('-')[0]

Approach

• New test file: shell/utils/__tests__/release-notes.test.ts (11 tests)
• Mocks getVersionData and READ_WHATS_NEW; all other collaborators (getters, dispatch) are inline mocks — no Vuex store mounting needed
• Each test case targets exactly one branch or behaviour
• Covers both happy paths (add fired) and guard conditions (add suppressed)

Coverage Impact

Before: release-notes.ts had 0% unit test coverage.
After: All conditional branches in addReleaseNotesNotification are exercised by the 11 tests.

Trade-offs

• dispatch is mocked as jest.fn().mockResolvedValue(undefined) — no real Vuex store overhead
• The i18n/t mock returns the translation key as-is; tests only assert structure, not translated strings

Reproducibility

yarn test:ci shell/utils/__tests__/release-notes.test.ts

Test Status

✅ 11/11 tests pass
✅ eslint --max-warnings 0 passes

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• download.cypress.io

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "download.cypress.io"

See Network Configuration for more information.

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