Adjust for unlimited plan option

packages/web/server/lib/quota/providers/copilot.test.js

@@ -19,10 +19,10 @@ const payload = {
   },
 };
 
-const mockResponse = () => ({
+const mockResponse = (body = payload) => ({
   ok: true,
   status: 200,
-  json: async () => payload,
+  json: async () => body,
 });
 
 describe('GitHub Copilot quota provider', () => {
@@ -39,4 +39,40 @@ describe('GitHub Copilot quota provider', () => {
     expect(result.usage.windows.premium_interactions.usedPercent).toBe(25);
     expect(result.usage.windows.premium_interactions.valueLabel).toBe('225 / 300 left');
   });
+
+  it.each([
+    ['primary provider', fetchQuota],
+    ['add-on provider', fetchQuotaAddon],
+  ])('reports unlimited plans without a percent for the %s', async (_name, fetchProviderQuota) => {
+    vi.stubGlobal('fetch', vi.fn().mockResolvedValue(mockResponse({
+      quota_reset_date: '2026-09-01T00:00:00Z',
+      quota_snapshots: {
+        premium_interactions: { unlimited: true, entitlement: -1, remaining: -1 },
+      },
+    })));
+
+    const result = await fetchProviderQuota();
+
+    expect(result.ok).toBe(true);
+    expect(result.usage.windows.premium_interactions.usedPercent).toBeNull();
+    expect(result.usage.windows.premium_interactions.valueLabel).toBe('Unlimited');
+  });
+
+  it.each([
+    ['primary provider', fetchQuota],
+    ['add-on provider', fetchQuotaAddon],
+  ])('falls back to percent_remaining when entitlement is unusable for the %s', async (_name, fetchProviderQuota) => {
+    vi.stubGlobal('fetch', vi.fn().mockResolvedValue(mockResponse({
+      quota_reset_date: '2026-09-01T00:00:00Z',
+      quota_snapshots: {
+        premium_interactions: { entitlement: 0, remaining: 0, percent_remaining: 75.5 },
+      },
+    })));
+
+    const result = await fetchProviderQuota();
+
+    expect(result.ok).toBe(true);
+    expect(result.usage.windows.premium_interactions.usedPercent).toBeCloseTo(24.5);
+    expect(result.usage.windows.premium_interactions.valueLabel ?? null).toBeNull();
+  });
 });