Feature: Identity document tracking
  Any received RG, CNH or passport identifies a passenger; a CPF alone
  does not.

  Scenario: A passport satisfies the identity requirement
    Given a passenger with a received passport
    When document readiness is checked
    Then the passenger is marked as received

  Scenario: A CPF alone is not enough
    Given a passenger with only a CPF
    When document readiness is checked
    Then the passenger is marked as missing