BillTracker/tests/spendingService.test.js

'use strict';

// Phase 1 — spendingService budgets were untested. Pins the dollars↔cents
// round-trip and the set/update/clear semantics of setSpendingBudget /
// getSpendingBudgets (getSpendingSummary's gating is separately reconciled
// against the Tracker in tests/reconciliation.test.js).
const test = require('node:test');
const assert = require('node:assert/strict');
const os = require('node:os');
const path = require('node:path');
const fs = require('node:fs');

const dbPath = path.join(os.tmpdir(), `bill-tracker-spendsvc-${process.pid}.sqlite`);
process.env.DB_PATH = dbPath;

const { getDb, closeDb } = require('../db/database.cts');
const { setSpendingBudget, getSpendingBudgets } = require('../services/spendingService.cts');

let db, userId, catId;
const rawCents = () =>
  db
    .prepare(
      'SELECT amount FROM spending_budgets WHERE user_id=? AND category_id=? AND year=2026 AND month=7',
    )
    .get(userId, catId)?.amount;

test.before(() => {
  db = getDb();
  userId = db
    .prepare(
      "INSERT INTO users (username, password_hash, role, active) VALUES ('spend-user','x','user',1)",
    )
    .run().lastInsertRowid;
  catId = db
    .prepare("INSERT INTO categories (user_id, name, spending_enabled) VALUES (?, 'Groceries', 1)")
    .run(userId).lastInsertRowid;
});
test.after(() => {
  closeDb();
  for (const s of ['', '-wal', '-shm']) {
    try {
      fs.rmSync(dbPath + s);
    } catch {}
  }
});

test('setSpendingBudget stores cents and getSpendingBudgets returns dollars', () => {
  setSpendingBudget(db, userId, catId, 2026, 7, 200);
  assert.equal(rawCents(), 20000, 'stored as integer cents');
  const budgets = getSpendingBudgets(db, userId, 2026, 7);
  assert.deepEqual(
    budgets,
    [{ category_id: catId, amount: 200, category_name: 'Groceries' }],
    'returned in dollars',
  );
});

test('setting the same category again updates in place (ON CONFLICT), no duplicate row', () => {
  setSpendingBudget(db, userId, catId, 2026, 7, 350.5);
  assert.equal(rawCents(), 35050);
  const budgets = getSpendingBudgets(db, userId, 2026, 7);
  assert.equal(budgets.length, 1, 'still one budget row for the category/month');
  assert.equal(budgets[0].amount, 350.5);
});

test('setting null clears the budget', () => {
  setSpendingBudget(db, userId, catId, 2026, 7, null);
  assert.equal(rawCents(), undefined, 'row deleted');
  assert.deepEqual(getSpendingBudgets(db, userId, 2026, 7), []);
});