### Question:
ValueSetConceptAccumulator implements IValueSetConceptAccumulator { @Override public void addMessage(String theMessage) { } ValueSetConceptAccumulator(@Nonnull TermValueSet theTermValueSet, @Nonnull ITermValueSetDao theValueSetDao, @Nonnull ITermValueSetConceptDao theValueSetConceptDao, @Nonnull ITermValueSetConceptDesignationDao theValueSetConceptDesignationDao); @Override void addMessage(String theMessage); @Override void includeConcept(String theSystem, String theCode, String theDisplay); @Override void includeConceptWithDesignations(String theSystem, String theCode, String theDisplay, Collection<TermConceptDesignation> theDesignations); @Override void excludeConcept(String theSystem, String theCode); Boolean removeGapsFromConceptOrder(); int getConceptsSaved();  }### Answer:
@Test public void testAddMessage() { myAccumulator.addMessage("foo"); verifyNoInteractions(myValueSetConceptDao); }