@Test public void clearProps() throws InvalidSmilesException {

    IAtomContainer mol = loadSmi("o1cccc1");
    int sizeBefore = mol.getProperties().size();
    assertTrue(mmff.assignAtomTypes(mol));
    assertTrue(mmff.partialCharges(mol));
    mmff.clearProps(mol);
    assertThat(mol.getProperties().size(), is(sizeBefore));
}