@Test
public void whenReverseList_thenReversed() {
final List<String> names = Lists.newArrayList("John", "Adam", "Jane");
final List<String> reversed = Lists.reverse(names);
assertThat(reversed, contains("Jane", "Adam", "John"));
}
@Test
public void whenPartitionList_thenPartitioned() {
final List<String> names = Lists.newArrayList("John", "Jane", "Adam", "Tom", "Viki", "Tyler");
final List<List<String>> result = Lists.partition(names, 2);
assertEquals(3, result.size());
assertThat(result.get(0), contains("John", "Jane"));
assertThat(result.get(1), contains("Adam", "Tom"));
assertThat(result.get(2), contains("Viki", "Tyler"));
}
@Test
public void whenCreateCharacterListFromString_thenCreated() {
final List<Character> chars = Lists.charactersOf("John");
assertEquals(4, chars.size());
assertThat(chars, contains('J', 'o', 'h', 'n'));
}
@Test
public void whenRemoveNullFromList_thenRemoved() {
final List<String> names = Lists.newArrayList("John", null, "Adam", null, "Jane");
Iterables.removeIf(names, Predicates.isNull());
assertEquals(3, names.size());
assertThat(names, contains("John", "Adam", "Jane"));
}
@Test
public void whenRemoveDuplicatesFromList_thenRemoved() {
final List<Character> chars = Lists.newArrayList('h', 'e', 'l', 'l', 'o');
assertEquals(5, chars.size());
final List<Character> result = ImmutableSet.copyOf(chars).asList();
assertThat(result, contains('h', 'e', 'l', 'o'));
}
@Test
public void whenCreateImmutableList_thenCreated() {
final List<String> names = Lists.newArrayList("John", "Adam", "Jane");
names.add("Tom");
assertEquals(4, names.size());
final ImmutableList<String> immutable = ImmutableList.copyOf(names);
assertThat(immutable, contains("John", "Adam", "Jane", "Tom"));
}
@Test
public void whenCreateList_thenCreated() {
final List<String> names = Lists.newArrayList("John", "Adam", "Jane");
names.add("Tom");
assertEquals(4, names.size());
names.remove("Adam");
assertThat(names, contains("John", "Jane", "Tom"));
}
@Test
public void whenGetTopUsingMultiSet_thenCorrect() {
final Multiset<String> names = HashMultiset.create();
names.add("John");
names.add("Adam", 5);
names.add("Jane");
names.add("Tom", 2);
final Set<String> sorted = Multisets.copyHighestCountFirst(names).elementSet();
final List<String> topTwo = Lists.newArrayList(sorted).subList(0, 2);
assertEquals(2, topTwo.size());
assertEquals("Adam", topTwo.get(0));
assertEquals("Tom", topTwo.get(1));
}
@Test
public void whenGroupListUsingMultimap_thenGrouped() {
final List<String> names = Lists.newArrayList("John", "Adam", "Tom");
final Function<String, Integer> function =
new Function<String, Integer>() {
@Override
public final Integer apply(final String input) {
return input.length();
}
};
final Multimap<Integer, String> groups = Multimaps.index(names, function);
assertThat(groups.get(3), containsInAnyOrder("Tom"));
assertThat(groups.get(4), containsInAnyOrder("John", "Adam"));
}