@Test
public void normaliseHetroAt3() {

    int[] cycle = new int[]{3, 2, 1, 4, 5, 3};
    int[] contr = new int[]{1, 1, 1, 1, 1, 1};
    contr[cycle[3]] = 2;
    Assert.assertTrue(MmffAromaticTypeMapping.normaliseCycle(cycle, contr));
    Assert.assertArrayEquals(new int[]{4, 5, 3, 2, 1, 4}, cycle);
}