@Test
  public void testPurchaseMonthlyPass() {

    PurchasingManager pm = new PurchasingManager();

    PurchaseMonthlyPassRequest request = new PurchaseMonthlyPassRequest();
    request.setMonth(4);
    request.setYear(2013);
    request.setMobileDeviceMAC("234234234");
    request.setVersion(1);
    PurchaseThreeDayPassCommand command = mock(PurchaseThreeDayPassCommand.class);
    doNothing().when(command).execute();

    PurchaseMonthlyPassResponse res = pm.purchaseMonthlyPass(request);
    assertNotNull(res);
  }