public void CopyTo()
{
var srcPool = new ComponentPool <SampleStructs.Foo>(2);
IComponentPool dstPool = new ComponentPool <SampleStructs.Foo>(2); // Less than component count to test array resize.
var idx1 = srcPool.New();
var idx2 = srcPool.New();
var idx3 = srcPool.New();
srcPool.Items[idx1].Item.x = 1;
srcPool.Items[idx1].Version = Version.Zero.GetNext();
srcPool.Items[idx2].Item.x = 2;
srcPool.Items[idx3].Item.x = 3;
srcPool.CopyTo(dstPool);
// Modify src
srcPool.Items[idx1].Item.x = 11;
srcPool.Items[idx1].Version = srcPool.Items[idx1].Version.GetNext();
var typedDstPool = (ComponentPool <SampleStructs.Foo>)dstPool;
Assert.Equal(11, srcPool.Items[idx1].Item.x);
Assert.Equal(1, typedDstPool.Items[idx1].Item.x);
Assert.Equal(3, typedDstPool.Items[idx3].Item.x);
Assert.Equal(Version.Zero.GetNext().GetNext(), srcPool.Items[idx1].Version);
Assert.Equal(Version.Zero.GetNext(), typedDstPool.Items[idx1].Version);
}