@Test
public void infeasibleAtoms() throws Exception {

    AtomMatcher mock = mock(AtomMatcher.class);
    when(mock.matches(any(IAtom.class), any(IAtom.class))).thenReturn(false);
    VFSubState state = createBenzeneToNaphthalene(mock, mock(BondMatcher.class));
    for (int i = 0; i < state.nMax(); i++) {
        for (int j = 0; j < state.mMax(); j++) {
            assertFalse(state.feasible(i, j));
        }
    }
}