MPDX-9600 - Staff Expense Report: Sort Income and Expenses in CSV exports by date

[zweatshirt]

Description

• It is easier to read transactions as a chronological timeline as opposed to by category.
  List any PRs that this PR is dependent on and any Jira tickets that this PR is related to.
  https://jira.cru.org/browse/MPDX-9600

Testing

• Impersonate someone with income and expenses
• Go to hrTools/staffExpense
• Export an income CSV, an expense CSV, and a dual income/expense CSV

Checklist:

• I have given my PR a title with the format "MPDX-(JIRA#) (summary sentence max 80 chars)"
• I have applied the appropriate labels (Add the label "Preview" to automatically create a preview environment)
• I have run the Claude Code /pr-review command locally and fixed any relevant suggestions
• I have requested a review from another person on the project
• I have tested my changes in preview or in staging
• I have cleaned up my commit history

[github-actions]

Bundle sizes [mpdx-react]

Compared against d5c2533

No significant changes found

[zweatshirt]

AI Multi-Agent Code Review

Verdict: ✅ CLEAN
Risk Score: 1/10 (LOW)
Agents: Architecture · Testing · Standards

---

Risk Assessment

Factor	Points
src/components/**/*.tsx (medium-risk component)	+1
Change volume <50 non-test lines	+0
Single-domain scope ×1.0	—
Total	1/10

---

Architecture — ✅ APPROVED

Strengths:

• [...transactions].sort(...) correctly avoids mutating the caller's array — no side effects on the input
• localeCompare on ISO 8601 strings (YYYY-MM-DD) is safe and produces correct chronological order — no need to parse into Luxon just for comparison
• Extracting dateSortTransactions separates sort policy from table-building in createTable, improving testability
• Exporting the function enables a direct unit test rather than asserting order transitively through CSV output

Suggestions (no action required):

Suggestion: The surrounding file uses const arrow-function declarations; dateSortTransactions uses a function declaration. Minor style inconsistency — either is valid.

Suggestion: Array.prototype.sort is stable (ES2019+), so equal dates retain input order. If a secondary sort key is ever desired, the comparator can be extended at that point.

---

Testing — ✅ APPROVED_WITH_SUGGESTIONS

Strengths:

• Test uses existing typed Transaction[] mock — no any leaks
• mockData[0].transactedAt changed from '2025-07-01' to '2025-10-01', making input order Oct/Aug/Sep — the test would actually fail if sort were removed, not coincidentally pass
• Assertion maps directly to transactedAt values and compares an exact array

Optional suggestions (no action required):

Suggestion: Edge cases not covered: empty array, single element, already-sorted input, ties/duplicate date. Low priority given the simplicity of the comparator.

Suggestion: The non-mutation guarantee (via [...transactions] spread) isn't explicitly tested. Adding one assertion that the original array order is unchanged after the call would lock that contract in.

Suggestion: mockData is now shared between download tests and the sort test. A future date change in mockData for another test could silently make the sort input already-sorted (and the test still pass). A local fixture inside the describe('dateSortTransactions') block would isolate this.

---

Standards — ✅ APPROVED

All checklist items pass: named export, no any, no new Date(), no debug output, no unused imports. The fixture date change from '2025-07-01' to '2025-10-01' is intentional — the earlier value was the earliest date and would have sorted first coincidentally, making the test trivially pass without exercising the sort.

---

Summary

Small, focused PR: extracts dateSortTransactions as a named export, wires it into createTable, and adds a direct unit test. All three agents approved. The sort approach (localeCompare on ISO 8601) is correct, the implementation is non-mutating, and the test genuinely exercises the reordering behavior.

🤖 Generated by multi-agent AI review (Architecture · Testing · Standards)

[github-actions]

AI Review Auto-Approval

Risk Level: LOW (1/10)
Verdict: CLEAN (no issues found)

This PR was auto-approved because:

• The multi-agent AI review determined it is low risk
• No blocking issues were found

If you believe this PR needs human review, dismiss this approval and request a review manually.

[github-actions]

Preview branch generated at https://MPDX-9600.d3dytjb8adxkk5.amplifyapp.com