### Question:
DistributedList { @SuppressWarnings("unchecked") public static <T> DistributedList<T> empty() { return (DistributedList<T>) EMPTY; } DistributedList(final List<WeightedElement<T>> underlyingWeights); static DistributedList<T> singleton(final T element); static DistributedList<T> weightedOrDefault(final Collection<T> underlyingSet); static DistributedList<T> uniform(final Collection<T> underlyingSet); @SuppressWarnings("unchecked") static DistributedList<T> empty(); List<WeightedElement<T>> distributedList(); T pickRandomly(RandomNumberGenerator random); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString(); Stream<T> stream(); List<T> list(); boolean isEmpty();  }### Answer:
@Test public void testEmptyIsEmpty() { DistributedList<String> empty = DistributedList.empty(); DistributedList<String> manualEmpty = new DistributedList<>(Collections.emptyList()); assertEquals(manualEmpty, empty); }