@Test
void checkSimpleMutabilityTest() {

    setUp();
    PermutationGenerator permutationGenerator = new PermutationGenerator();
    OTTopologyFragmentRefinementModel refinementModel = (OTTopologyFragmentRefinementModel) candidateForTopology3WithDa.getRefinementModel();
    assertTrue(permutationGenerator.checkMutability(refinementModel));
    List<OTStringList> options = refinementModel.getPermutationOptions();
    assertNotNull(options);
    assertEquals(2, options.size());
    options.forEach(permutationOption -> assertEquals(1, permutationOption.getValues().size()));
}