@Test
public void getConnectivity() {

    String acpString = "C0C1C2C3 0:1(1),0:3(1),1:2(1),2:3(1)";
    BondRefinable bondRefinable = refinable(acpString);
    assertEquals(1, bondRefinable.getConnectivity(0, 1));
    assertEquals(1, bondRefinable.getConnectivity(0, 2));
    assertEquals(1, bondRefinable.getConnectivity(1, 3));
    assertEquals(1, bondRefinable.getConnectivity(2, 3));
}