docs: def brain_post(connection, requirements=None):
      """
      Power On Self Test for the brain.
  
      Checks that the brain is appropriately seeded and ready for use.
  
      Raises AssertionError's if the brain is not ready.
  
      :param connection:  <rethinkdb.net.DefaultConnection>
      :param requirements:<dict> keys=Required Databases, key-values=Required Tables in each database
      :return: <rethinkdb.net.DefaultConnection> if verified
      """
      assert isinstance(connection, DefaultConnection)
      remote_dbs = validate_get_dbs(connection)
      assert validate_brain_requirements(connection, remote_dbs, requirements)
      assert validate_write_access(connection)
      return connection