public void SimpleIndexedSetTest()
{
const double FirstElement = 17;
const double SecondElement = Math.PI;
const double ThirdElement = 6.23123438874;
const double FourthElement = 43;
var indexedSet = new IndexedSet <double>(new[] { FirstElement, SecondElement });
Assert.Equal(2, indexedSet.Count);
Assert.True(indexedSet.Contains(FirstElement));
var elements = indexedSet.Elements.ToArray();
Assert.Equal(SecondElement, elements[1]);
Assert.Equal(SecondElement, indexedSet.GetElementByIndex(1));
int secondElementIndex;
Assert.True(indexedSet.TryGetIndex(Math.PI, out secondElementIndex));
Assert.Equal(1, secondElementIndex);
indexedSet.Add(ThirdElement);
Assert.Equal(3, indexedSet.Count);
Assert.True(indexedSet.Contains(ThirdElement));
int fourthElementIndex;
Assert.Throws <ArgumentException>(() => indexedSet.Add(ThirdElement));
Assert.Throws <ArgumentOutOfRangeException>(() => indexedSet.GetElementByIndex(3));
Assert.False(indexedSet.TryGetIndex(FourthElement, out fourthElementIndex));
indexedSet.Add(ThirdElement, false);
indexedSet.Add(FourthElement);
Assert.Equal(FourthElement, indexedSet.GetElementByIndex(3));
indexedSet.Clear();
Assert.Equal(0, indexedSet.Count);
Assert.Throws <ArgumentException>(() => new IndexedSet <double>(new[] { FirstElement, SecondElement, SecondElement }));
}
