public void TestMapChunk1()
{
var a = new Group(new int[]{0, 10});
var b = a.MapChunks(2);
Assert.True (b[0] == 0);
Assert.True (b[1] == 2);
Assert.True (b[2] == 4);
Assert.True (b[3] == 6);
Assert.True (b[4] == 8);
}
