4 tests in total :

  * Common to all :
    - Gather lagent and ragent candidates
    - Delay STUN response for lagent
    - Make sure connchecks succeed and data is sent across
      to lagent

  * standard_test :
    - Set remote candidates for lagent while lagent is still
      gathering it's own candidates

  * bad_credentials_test :
    - Set incorrect credentials for both lagent and ragent
    - Make sure connchecks fail
    - Signal STUN response and set correct credentials

  * bad_candidate_test :
    - Set a bad remote candidate for lagent
    - Make sure connchecks fail
    - Signal STUN response and set correct remote candidates

  * new_candidate_test :
    - As soon as a new local candidate is found set it as
      the remote candidate for the other agent