(Deno.test): Improve Factory Object for async ops

factory_helper.ts

export function promisifyFactoryObj<TFactory>(
  obj: TFactory,
  status = 200,
): Promise<Response> {
  return Promise.resolve(
    new Response(JSON.stringify(obj), { status }),
  )
}

Example of use case could be when needing to mock an API response.
It can work with a single obj, or an array.

// usage ex.


interface User {
 id: number
 firstName: string
}

const fakeUsers = [{
  id: 1,
  firstName: 'Alex',

  }, 
  {
     id: 2,
     firstName: 'Mark',
  }
}]

stub(
      globalThis,
      'fetch',
      returnsNext([
        promisifyFactoryObj<User[]>(fakeUsers),
      ]),
    )