@Test
public void whenCalculateUnionOfSets_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b', 'c');
final Set<Character> second = ImmutableSet.of('b', 'c', 'd');
final Set<Character> union = Sets.union(first, second);
assertThat(union, containsInAnyOrder('a', 'b', 'c', 'd'));
}
@Test
public void whenCalculatingSetIntersection_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b', 'c');
final Set<Character> second = ImmutableSet.of('b', 'c', 'd');
final Set<Character> intersection = Sets.intersection(first, second);
assertThat(intersection, containsInAnyOrder('b', 'c'));
}
@Test
public void whenCalculatingPowerSet_thenCorrect() {
final Set<Character> chars = ImmutableSet.of('a', 'b');
final Set<Set<Character>> result = Sets.powerSet(chars);
final Set<Character> empty = ImmutableSet.<Character>builder().build();
final Set<Character> a = ImmutableSet.of('a');
final Set<Character> b = ImmutableSet.of('b');
final Set<Character> aB = ImmutableSet.of('a', 'b');
assertThat(result, contains(empty, a, b, aB));
}
@Test
public void whenCalculateSetsProduct_thenCorrect() {
final Set<Character> first = ImmutableSet.of('a', 'b');
final Set<Character> second = ImmutableSet.of('c', 'd');
final Set<List<Character>> result = Sets.cartesianProduct(ImmutableList.of(first, second));
final Function<List<Character>, String> func =
new Function<List<Character>, String>() {
@Override
public final String apply(final List<Character> input) {
return Joiner.on(" ").join(input);
}
};
final Iterable<String> joined = Iterables.transform(result, func);
assertThat(joined, containsInAnyOrder("a c", "a d", "b c", "b d"));
}