test("Intercept property access using es6 Proxies", () => {

  const obj = {

    _id: "klsjdahflkastfaskfdg",

    name: "Khaled"

  };

  const handler = {

    get: (target, prop) => {

      if (prop[] === "_") {

        throw new TypeError("Access denied");

      }

      return target[prop];

    },

    set: (target, prop, value) => {

      if (prop[] === "_") {

        throw new TypeError("Access denied");

      }

      target[prop] = value;

      return true;

    }

  };

  const proxy = new Proxy(obj, handler);

  expect(() => {

    proxy._id;

  }).toThrow();

  expect(() => {

    proxy._id = "something";

  }).toThrow();

});