public void GetRandomItem_WithCollection_ReturnsCorrectItem(int randomNumber)
{
var mockRandomNumberGenerator = new Mock <IRandomNumberGenerator>();
mockRandomNumberGenerator.Setup(x => x.GetRandomInteger(3)).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.GetRandomItem <WeightedItem>(items);
Assert.AreEqual(items[randomNumber - 1], item);
mockRandomNumberGenerator.Verify(x => x.GetRandomInteger(3), Times.Once);
mockRandomNumberGenerator.VerifyNoOtherCalls();
}
public void GetRandomItem_WithEmptyArray_Throws()
{
var randomItemSelector = new RandomItemSelector(new RandomNumberGenerator());
Assert.Throws <ArgumentException>(() => randomItemSelector.GetRandomItem <WeightedItem>(new WeightedItem[0]));
}
