@Override
protected void verify_internal_effects() {
Iterables iterables = getIterables(assertions);
assertThat(iterables).isNotSameAs(iterablesBefore);
assertThat(iterables.getComparisonStrategy()).isInstanceOf(ComparatorBasedComparisonStrategy.class);
ComparatorBasedComparisonStrategy strategy = (ComparatorBasedComparisonStrategy) iterables.getComparisonStrategy();
assertThat(strategy.getComparator()).isInstanceOf(OnFieldsComparator.class);
assertThat(((OnFieldsComparator)strategy.getComparator()).getFields()).containsOnly("field");
}