src/main/java/org/fest/assertions/api/AbstractCollectionAssert.java
@Override
  public final S containsOnly(Object... values) {
    collections.assertContainsOnly(description, actual, values);
    return myself;
  }
@Override
  public final S containsOnly(Object... values) {
    collections.assertContainsOnly(description, actual, values);
    return myself;
  }
{@inheritDoc}