private static PartyComposition RemoveChildrenFrom(PartyComposition partyComposition)
{
return(new PartyComposition(
partyComposition.Adults,
partyComposition.Children - 1,
partyComposition.Babies));
}
private static PartyComposition RemoveBabies(PartyComposition partyComposition)
{
return(new PartyComposition(
partyComposition.Adults,
partyComposition.Children,
0));
}
public Property BabiesDoNotPayHo(PartyComposition partyComposition)
{
Func <bool> property = () =>
TripPriceCalculator.GetPrice(partyComposition) ==
TripPriceCalculator.GetPrice(RemoveBabies(partyComposition));
return(property.When(partyComposition.Babies != 0)
.Classify(partyComposition.Children == 0, "Without children")
.Classify(partyComposition.Children != 0, "With children"));
}
public Property ChildrenPayLessThanAdults(PartyComposition partyComposition)
{
Func <bool> property = () =>
{
var adultPrice =
TripPriceCalculator.GetPrice(partyComposition) -
TripPriceCalculator.GetPrice(RemoveAdultFrom(partyComposition));
var childPrice =
TripPriceCalculator.GetPrice(partyComposition) -
TripPriceCalculator.GetPrice(RemoveChildrenFrom(partyComposition));
return(adultPrice > childPrice);
};
return(property.When(partyComposition.Adults > 2 && partyComposition.Children > 2));
}
public Property TripsCantBeForFree(PartyComposition partyComposition)
{
return((TripPriceCalculator.GetPrice(partyComposition) != 0).ToProperty());
}
