new_contents: #!/usr/bin/env python
  import pytest
  from datetime import datetime
  from mlbgame import roster
  
  team_id = 117
  r = roster.Roster(team_id)
  
  def test_roster_url():
      roster_url = 'http://mlb.mlb.com/lookup/json/named.roster_40.bam?team_id=117'
      assert r.roster_url == roster_url
  
  
  def test_roster_is_list():
      assert type(r.roster) is list
  
subject: Add a couple simple pytest tests for roster class