@Test
public void testGetLength2D_IBond() {

    Atom o = new Atom("O", new Point2d(0.0, 0.0));
    Atom c = new Atom("C", new Point2d(1.0, 0.0));
    Bond bond = new Bond(c, o);
    Assert.assertEquals(1.0, GeometryTools.getLength2D(bond), 0.001);
}