message: test(warns): add a warning test when `next` is called twice
diff: @@ -354,7 +354,17 @@ describe('Router', () => {
  it.todo('avoid infinite redirection loops when doing router.back()')
  - it.todo('warns if `next` is called twice')
  + it('warns if `next` is called twice', async () => {
  + const { router } = await newRouter()
  + router.beforeEach((to, from, next) => {
  + next()
  + next()
  + })
  + await router.push('/foo')
  + expect(
  + 'It should be called exactly one time in each navigation guard'
  + ).toHaveBeenWarned()
  + })
  })
  describe('alias', () => {
  