scope test_indexSingletonConceptIfUnindexed {

  concept #Bla {}
  concept #Blo {}
  
  svoid test_indexSingletonConceptIfUnindexed() {
    new Concepts cc;
    assertTrue(indexSingletonConceptIfUnindexed(cc, Bla));
    assertTrue(indexSingletonConceptIfUnindexed(cc, Blo));
    assertFalse(indexSingletonConceptIfUnindexed(cc, Bla));
    assertFalse(indexSingletonConceptIfUnindexed(cc, Blo));
  }
  
}