fix: support new vercel style

util/testHelpers.ts

@@ -0,0 +1,16 @@
+export async function mockProvider(
+  provider: any,
+  query: unknown,
+): Promise<string> {
+  const req = {
+    query,
+  };
+  const res = {
+    status: jest.fn().mockReturnThis(),
+    send: jest.fn().mockReturnThis(),
+    json: jest.fn().mockReturnThis(),
+    setHeader: jest.fn(),
+  };
+  await provider(req, res);
+  return res.json.mock.calls[0][0];
+}