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frontend/tests/quotaPlanTier.test.ts

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+import { describe, expect, test } from 'vitest';
+import {
+  ELITE_CODEX_PLAN_TYPE,
+  PREMIUM_CODEX_PLAN_TYPES,
+  resolvePlanTier,
+} from '@/utils/quota';
+
+describe('resolvePlanTier', () => {
+  test("elite wins for 'pro' even though it is also in the premium set (order contract)", () => {
+    // 顺序契约回归：'pro' 同时命中 PREMIUM_CODEX_PLAN_TYPES，
+    // 一旦 premium 判断先行，Pro 20x 会静默退回金卡。
+    expect(PREMIUM_CODEX_PLAN_TYPES.has(ELITE_CODEX_PLAN_TYPE)).toBe(true);
+    expect(resolvePlanTier('pro')).toBe('elite');
+  });
+
+  test('normalizes case and whitespace before matching', () => {
+    expect(resolvePlanTier('PRO')).toBe('elite');
+    expect(resolvePlanTier('  Pro  ')).toBe('elite');
+    expect(resolvePlanTier('Pro-Lite')).toBe('premium');
+  });
+
+  test('maps every pro-lite spelling to premium', () => {
+    expect(resolvePlanTier('prolite')).toBe('premium');
+    expect(resolvePlanTier('pro-lite')).toBe('premium');
+    expect(resolvePlanTier('pro_lite')).toBe('premium');
+  });
+
+  test('maps ordinary and unknown plans to plain', () => {
+    expect(resolvePlanTier('plus')).toBe('plain');
+    expect(resolvePlanTier('team')).toBe('plain');
+    expect(resolvePlanTier('free')).toBe('plain');
+    expect(resolvePlanTier('enterprise')).toBe('plain');
+  });
+
+  test('maps missing values to plain', () => {
+    expect(resolvePlanTier(null)).toBe('plain');
+    expect(resolvePlanTier(undefined)).toBe('plain');
+    expect(resolvePlanTier('')).toBe('plain');
+    expect(resolvePlanTier('   ')).toBe('plain');
+  });
+});