public void CallDuration_TwentyCentsCallCost312_CallDurationFourteenMinutes()
{
PhoneCall phoneCall = new PhoneCall(3, 1, 2, 20);
Assert.AreEqual(14, phoneCall.CallDuration());
}
public void CallDuration_FiftySixCentsCallCost523_CallDurationTwentOneMinutes()
{
PhoneCall phoneCall = new PhoneCall(5, 2, 3, 55);
Assert.AreEqual(21, phoneCall.CallDuration());
}