public void SimplePool()
{
SimplePool <TestPoolable> pool = new SimplePool <TestPoolable>(10);
Assert.That(pool.Available, Is.EqualTo(0));
var item = pool.Get();
Assert.That(item, Is.Not.Null);
Assert.That(() => pool.Recycle(item), Throws.Nothing);
Assert.That(pool.Available, Is.EqualTo(1));
Assert.Throws <InvalidOperationException>(() => pool.Recycle(item));
Assert.Throws <ArgumentNullException>(() => pool.Recycle(null));
Assert.That(pool.Available, Is.EqualTo(1));
}