* upstream/develop:
  implement getWebhookInfo method
  Fix duplicate test case
  Add test for unit testing class Entitiel/User
  Move AudioTest.php from tests/Unit* to tests/unit*
  Fix error importing class TestHelpers
  Correcting grammatical errors
  Add unit test for Audio class
  Add helper method generate fake audio recorded data
  Add dependency for ext-mbstring, as suggested by @IronLady in #92 [skip ci]