test: cover transaction ordering

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [Backend 0.9.1] - 2026-08-20
+
+### Added
+
+- Added runnable coverage for date and amount sorting tie-breakers.
+
 ## [Backend 0.9.0] - 2026-08-20
 
 ### Added

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@family-budget/backend",
-  "version": "0.9.0",
+  "version": "0.9.1",
   "private": true,
   "scripts": {
     "dev": "tsx watch src/app.ts",
@@ -11,6 +11,7 @@
     "test:analytics": "tsx src/services/analyticsSemantics.test.ts",
     "test:portfolio": "tsx src/services/portfolio.test.ts",
     "test:portfolio:db": "NODE_ENV=test tsx src/services/portfolio.integration.test.ts",
+    "test:transactions": "tsx src/services/transactions.test.ts",
     "test:analytics:db": "NODE_ENV=test tsx src/services/analytics.integration.test.ts",
     "test:import:db": "NODE_ENV=test tsx src/services/import.integration.test.ts",
     "test:llm": "tsx src/scripts/testLlm.ts"

backend/src/services/transactions.test.ts

@@ -0,0 +1,13 @@
+import assert from 'node:assert/strict';
+import { transactionOrderBy } from './transactions';
+
+assert.equal(
+  transactionOrderBy('date', 'desc'),
+  't.operation_at DESC, t.source_position ASC, t.id ASC',
+);
+assert.equal(
+  transactionOrderBy('date', 'asc'),
+  't.operation_at ASC, t.source_position DESC, t.id DESC',
+);
+assert.match(transactionOrderBy('amount', 'desc'), /t\.amount_signed DESC.*t\.operation_at DESC.*t\.source_position ASC.*t\.id DESC/);
+console.log('transaction ordering: OK');

backend/src/services/transactions.ts

@@ -7,16 +7,18 @@ import type {
   UpdateTransactionRequest,
 } from '@family-budget/shared';
 
+export function transactionOrderBy(sortBy: 'date' | 'amount', sortOrder: 'asc' | 'desc'): string {
+  const direction = sortOrder === 'asc' ? 'ASC' : 'DESC';
+  if (sortBy === 'amount') return `t.amount_signed ${direction}, t.operation_at DESC, t.source_position ASC, t.id DESC`;
+  return `t.operation_at ${direction}, t.source_position ${direction === 'ASC' ? 'DESC' : 'ASC'}, t.id ${direction === 'ASC' ? 'DESC' : 'ASC'}`;
+}
+
 export async function getTransactions(
   params: GetTransactionsParams,
 ): Promise<PaginatedResponse<Transaction>> {
   const page = params.page ?? 1;
   const pageSize = [10, 50, 100].includes(params.pageSize ?? 50) ? (params.pageSize ?? 50) : 50;
-  const sortBy = params.sortBy === 'amount' ? 't.amount_signed' : 't.operation_at';
-  const sortOrder = params.sortOrder === 'asc' ? 'ASC' : 'DESC';
-  const orderBy = params.sortBy === 'amount'
-    ? `${sortBy} ${sortOrder}, t.operation_at DESC, t.source_position ASC, t.id DESC`
-    : `t.operation_at ${sortOrder}, t.source_position ${sortOrder === 'ASC' ? 'DESC' : 'ASC'}, t.id ${sortOrder === 'ASC' ? 'DESC' : 'ASC'}`;
+  const orderBy = transactionOrderBy(params.sortBy === 'amount' ? 'amount' : 'date', params.sortOrder === 'asc' ? 'asc' : 'desc');
 
   const conditions: string[] = [];
   const values: unknown[] = [];