### Question:
SiteMapExtractorImpl extends SiteMapExtractorBase { @Override protected Iterable<? extends PropertyProvider> getDefaultPropertyProviders() { return propertyProviders; } SiteMapExtractorImpl(final SiteMapConfiguration configuration,
                                final SiteMapUrlBuilder urlBuilder,
                                final UrlExternalizer urlExternalizer,
                                final PropertyProvider... propertyProviders); @Override SiteMapConfiguration getConfiguration();  }### Answer:
@Test public void getDefaultPropertyProviders() { List<PropertyProvider> list = new ArrayList<>(); model.getDefaultPropertyProviders().forEach(list::add); assertTrue(list.contains(changeFreq)); assertTrue(list.contains(lastMod)); assertTrue(list.contains(priority)); }