@Test
public void testGetNumberOfIsotopes() {

    IsotopePattern isoP = new IsotopePattern();
    IsotopeContainer iso1 = new IsotopeContainer();
    isoP.setMonoIsotope(iso1);
    IsotopeContainer iso2 = new IsotopeContainer();
    isoP.addIsotope(iso2);
    Assert.assertEquals(2, isoP.getNumberOfIsotopes());
}