@Test
public void testGetHTML_IMolecularFormulaWithIsotope() {

    MolecularFormula formula = new MolecularFormula();
    formula.addIsotope(ifac.getMajorIsotope("C"), 2);
    formula.addIsotope(ifac.getMajorIsotope("H"), 6);
    Assert.assertEquals("<sup>12</sup>C<sub>2</sub><sup>1</sup>H<sub>6</sub>",
            MolecularFormulaManipulator.getHTML(formula, false, true));
}