优化

src/modules/first-leg/utils/inboundBilling.test.mjs

@@ -0,0 +1,20 @@
+import assert from 'node:assert/strict'
+import { readFileSync } from 'node:fs'
+import test from 'node:test'
+
+const source = readFileSync(new URL('./inboundBilling.ts', import.meta.url), 'utf8')
+
+test('formats zero values, currencies, measurements, and backend dates without hardcoded business factors', () => {
+  assert.match(source, /value === null \|\| value === undefined/)
+  assert.match(source, /Intl\.NumberFormat\('zh-CN'/)
+  assert.match(source, /style: 'currency'/)
+  assert.match(source, /Intl\.DateTimeFormat\('zh-CN'/)
+  assert.doesNotMatch(source, /\b167\b|\b363\b/)
+})
+
+test('translates backend rounding modes into customer-facing calculation labels', () => {
+  assert.match(source, /export function getRoundingModeLabel/)
+  assert.match(source, /CEILING: '向上取整'/)
+  assert.match(source, /HALF_UP: '四舍五入'/)
+  assert.match(source, /return labels\[value\] \|\| value \|\| '-'/)
+})