assertTrue(model.getUnitDefinition("substance").getName().equals("nanomole (new default)"));
Species dClk = model.getSpecies("dClk");
assertTrue(dClk.getCompartment().equals("CELL"));
dClk.unsetCompartment();
assertTrue(dClk.getCompartment().length() == 0);
assertTrue(dClk != null);
assertTrue(dClk.getName().length() == 0);