public void GetRandomWeightedItem_WithCollection_ReturnsCorrectItem(int randomNumber, int expectedItem)
{
var mockRandomNumberGenerator = new Mock <IRandomNumberGenerator>();
mockRandomNumberGenerator.Setup(x => x.GetRandomInteger(6)).Returns(randomNumber);
var randomItemSelector = new RandomItemSelector(mockRandomNumberGenerator.Object);
var items = new WeightedItem[]
{
new WeightedItem {
RandomizationWeight = 1
},
new WeightedItem {
RandomizationWeight = 2
},
new WeightedItem {
RandomizationWeight = 3
},
};
var item = randomItemSelector.GetRandomWeightedItem <WeightedItem>(items);
Assert.AreEqual(items[expectedItem], item);
mockRandomNumberGenerator.Verify(x => x.GetRandomInteger(6), Times.Once);
mockRandomNumberGenerator.VerifyNoOtherCalls();
}
public void GetRandomWeightedItem_WithEmptyArray_Throws()
{
var randomItemSelector = new RandomItemSelector(new RandomNumberGenerator());
Assert.Throws <ArgumentException>(() => randomItemSelector.GetRandomWeightedItem <WeightedItem>(new WeightedItem[0]));
}