public void TestEachFuncIsNotNull()
{
Vec2 start = new Vec2(2, 3);
Vec2 result;
Assert.Throws <ArgumentNullException>(() => result = start.Each(null));
}
public void TestEach()
{
Vec2 start = new Vec2(2, 3);
Vec2 result = start.Each((coord) => coord + 2);
Assert.AreEqual(new Vec2(2, 3), start);
Assert.AreEqual(new Vec2(4, 5), result);
}