vb.append(1.0);
assertEquals(Vector1.of(1.0), vb.toVector());
vb.append(2.0);
assertEquals(Vector2.of(1.0, 2.0), vb.toVector());
vb.append(3.0);
assertEquals(Vector3.of(1.0, 2.0, 3.0), vb.toVector());
vb.append(4.0);
assertEquals(Vector4.of(1.0, 2.0, 3.0, 4.0), vb.toVector());
vb.append(5.0);
assertEquals(Vector.of(1.0, 2.0, 3.0, 4.0, 5.0), vb.toVector());
}