public void testMethods() { gsm.addCallToCallHistory(call1); gsm.addCallToCallHistory(call2); gsm.displayCallHistory(); Console.WriteLine("Price before removing longest call: " + gsm.calculateCallPriceInCallHistory(price)); gsm.removeLongestCall(); Console.WriteLine("Price without longest call: " + gsm.calculateCallPriceInCallHistory(price)); gsm.clearCallHistory(); gsm.displayCallHistory(); }