phase-1: optimize code

tests/MarketRegime.test.js

@@ -0,0 +1,69 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { MarketRegime } from '../src/market/MarketRegime.js';
+import { SECTOR, ASSET_TYPE } from '../src/config/constants.js';
+
+const regime = (benchmarks, extra = {}) => new MarketRegime({ benchmarks, ...extra });
+
+test('stock inflated P/E = marketPE × 1.5', () => {
+  const { gates } = regime({ marketPE: 24 }).getInflatedOverrides(ASSET_TYPE.STOCK, SECTOR.GENERAL);
+  assert.equal(gates.maxPERatio, Math.round(24 * 1.5)); // 36
+});
+
+test('tech inflated P/E = techPE × 1.3', () => {
+  const { gates } = regime({ techPE: 40 }).getInflatedOverrides(
+    ASSET_TYPE.STOCK,
+    SECTOR.TECHNOLOGY,
+  );
+  assert.equal(gates.maxPERatio, Math.round(40 * 1.3)); // 52
+});
+
+test('REIT inflated minYield = reitYield × 0.85 in NORMAL rate regime', () => {
+  const { thresholds } = regime({ reitYield: 4.0 }, { rateRegime: 'NORMAL' }).getInflatedOverrides(
+    ASSET_TYPE.STOCK,
+    SECTOR.REIT,
+  );
+  assert.equal(thresholds.minYield, +(4.0 * 0.85).toFixed(2)); // 3.40
+});
+
+test('REIT inflated minYield = reitYield × 0.95 in HIGH rate regime', () => {
+  const { thresholds } = regime({ reitYield: 4.0 }, { rateRegime: 'HIGH' }).getInflatedOverrides(
+    ASSET_TYPE.STOCK,
+    SECTOR.REIT,
+  );
+  assert.equal(thresholds.minYield, +(4.0 * 0.95).toFixed(2)); // 3.80
+});
+
+test('bond inflated minSpread = igSpread × 0.80 in NORMAL rate regime', () => {
+  const { thresholds } = regime({ igSpread: 1.5 }, { rateRegime: 'NORMAL' }).getInflatedOverrides(
+    ASSET_TYPE.BOND,
+    SECTOR.GENERAL,
+  );
+  assert.equal(thresholds.minSpread, +(1.5 * 0.8).toFixed(2)); // 1.20
+});
+
+test('bond inflated minSpread = igSpread × 0.90 in HIGH rate regime', () => {
+  const { thresholds } = regime({ igSpread: 1.5 }, { rateRegime: 'HIGH' }).getInflatedOverrides(
+    ASSET_TYPE.BOND,
+    SECTOR.GENERAL,
+  );
+  assert.equal(thresholds.minSpread, +(1.5 * 0.9).toFixed(2)); // 1.35
+});
+
+test('GENERAL stock P/E multiplier compresses to 1.2× in HIGH rate regime', () => {
+  const { gates } = regime({ marketPE: 25 }, { rateRegime: 'HIGH' }).getInflatedOverrides(
+    ASSET_TYPE.STOCK,
+    SECTOR.GENERAL,
+  );
+  assert.equal(gates.maxPERatio, Math.round(25 * 1.2)); // 30
+});
+
+test('ETF inflated loosens expense gate to 0.75', () => {
+  const { gates } = regime({}).getInflatedOverrides(ASSET_TYPE.ETF);
+  assert.equal(gates.maxExpenseRatio, 0.75);
+});
+
+test('falls back to defaults when benchmarks missing', () => {
+  const { gates } = new MarketRegime({}).getInflatedOverrides(ASSET_TYPE.STOCK, SECTOR.GENERAL);
+  assert.equal(gates.maxPERatio, Math.round(22 * 1.5)); // default marketPE = 22
+});