fix: fix lint warnings for test files

test/user.test.ts

@@ -1,3 +1,4 @@
+import {} from 'jest';
 import * as supertest from "supertest";
 const request = supertest("http://localhost:8000");
 
@@ -13,4 +14,4 @@ describe("GET /signup", () => {
     request.get("/signup")
       .expect(200, done);
   });
-});
+});