public void getTripAverageTest()
{
TripDB tripDB = new TripDB();
int tripID = tripDB.addTrip(3);
int payerId1 = tripDB.addPayer(tripID, 0, 1);
int payerId2 = tripDB.addPayer(tripID, 1, 1);
int payerId3 = tripDB.addPayer(tripID, 2, 1);
tripDB.addPrice(payerId1, 0, 5.0);
tripDB.addPrice(payerId2, 0, 10.0);
tripDB.addPrice(payerId3, 0, 15.0);
double average = tripDB.getTripAverage(tripID);
Assert.AreEqual(average, 10.0);
}