How can I write a mock for GraphQL subscriptions/websockets using CodeceptJS?

Question

if we have http reqest we write mock like this

      this.mockRoute(
        'https://<endpoint>*',
        (route) => {
          route.fulfill({
            status: 200,
            json: jsonMock
          })
        }
      )

i whould like to know how to write mock for subsciptions

the easyest way is just try to write,but as expected it diesnt work

     this.mockRoute(
        'wss://<endpoint>*',
        (route) => {
          route.fulfill({
            status: 200,
            json: jsonMock
          })
        }
      )