hapi + jest / how testing update user?

[robokonk]

I have problem with one test:

test('update user', async () => {
  const updatedFirstName = 'test-first-name-UPDATED'
  const updatedLastName = 'test-last-name-UPDATED'

  const response = await server.inject({
    method: 'PUT',
    url: `/users/${userId}`,
    payload: {
      firstName: updatedFirstName,
      lastName: updatedLastName,
    },
  })
  expect(response.statusCode).toEqual(200)
  const user = JSON.parse(response.payload)
  expect(user.firstName).toEqual(updatedFirstName)
  expect(user.lastName).toEqual(updatedLastName)
})

I get:
expect(received).toEqual(expected) // deep equality Expected: 200 / Received: 500.

Bellow full code:

https://pastebin.com/i8JjbkeE
https://pastebin.com/cTshA0PW

What is wrong with this test?
My database is empty ofc.