// create a Subscription from a Tariff
@Test
public void testSimpleSub() {
TariffSubscription ts = tariffMarketService.subscribeToTariff(tariff, customer, 3);
assertNotNull("non-null subscription", ts);
assertEquals("correct customer", customer, ts.getCustomer());
assertEquals("correct tariff", tariff, ts.getTariff());
assertEquals("correct customer count", 3, ts.getCustomersCommitted());
}
