public void CanPurchase_NullSubcriptionType_ReturnsFalse()
{
FakeTestingValidator fakeValidator
= makeFakeValidator(true);
PersonLogicBTestable logicUnderTest =
makeLogicWithValidator(fakeValidator);
Person p = makePersonWithPurchasePossible();
p.SubscriptionType = null;
//test
bool canPurchase = logicUnderTest.CanPurchase(p);
Assert.IsFalse(canPurchase);
}