public void AddOne_NullValueMustThrow_Test()
{
//Arrange
List <string> list = new List <string> {
"Apple", "Orange"
};
AmountOfItems <string> amountOfItems = ListBackedAmountOfItems <string> .Build(list);
//Act
amountOfItems.AddOne(null);
//Asssert execption thrown
}
public void AmountOf_IncreasesByOneWhenAddingOne_Test()
{
//Arrange
int literalToAdd = 0;
List <int> list = new List <int>();
AmountOfItems <int> amountOfItems = ListBackedAmountOfItems <int> .Build(list);
var equalityOperation = IntEqualityByLiteral.Build();
int expected = 1;
amountOfItems.AddOne(literalToAdd);
//Act
int after = amountOfItems.AmountOf(literalToAdd, equalityOperation);
//Assert
Assert.AreEqual(expected, after);
}