message: test(background): fix mock
diff: @@ -23,6 +23,10 @@ jest.mock('@/background/pdf-sniffer', () => {
  return { init: jest.fn() }
  })
  +jest.mock('@/background/server', () => {
  + return { openQSPanel: jest.fn() }
  +})
  +
  jest.mock('@/_helpers/check-update', () => {
  return jest.fn().mockReturnValue(Promise.resolve())
  })
  