@Test
public void testNext() {
Function<String, String> next = null;
Helpers.assertThrows(NullPointerException.class, () -> new Range<>("").next(next));
BiFunction<String, Integer, String> biNext = null;
Helpers.assertThrows(NullPointerException.class, () -> new Range<>("").next(biNext));
}
@Test
public void testUntil() {
Range<Character> range = new Range<>('a').until('z');
assertThat(range.getTo(), is('z'));
assertThat(range.isToIncluded(), is(false));
Helpers.assertThrows(NullPointerException.class, () -> new Range<>("").until(null));
}
@Test
public void testIterator() {
Iterator<Integer> itr = new Range<>(1).to(1).next(i -> i + 1).iterator();
assertThat(itr.next(), is(1));
assertThat(itr.hasNext(), is(false));
final Iterator<Integer> it = itr;
Helpers.assertThrows(NoSuchElementException.class, () -> it.next());
itr = new Range<>(1).to(2).next(i -> i + 1).iterator();
assertThat(itr.next(), is(1));
assertThat(itr.next(), is(2));
assertThat(itr.hasNext(), is(false));
itr = new Range<>(1).next(i -> i + 1).iterator();
assertThat(itr.hasNext(), is(true));
for (int i = 0; i < 100; i++) {
itr.next();
}
assertThat(itr.next(), is(101));
assertThat(itr.hasNext(), is(true));
List<Integer> list = new ArrayList<>();
for (int d : new Range<>(1).next(i -> i + 1).until(5)) {
list.add(d);
}
assertThat(list, equalTo(Arrays.asList(1, 2, 3, 4)));
}
@Test
public void testTake() {
assertThat(new Range<>(1).next(i -> i + 1).take(0), equalTo(Seqs.newMutableSeq()));
assertThat(new Range<>(1).next(i -> i + 1).take(5), equalTo(Seqs.newMutableSeq(1, 2, 3, 4, 5)));
assertThat(new Range<>(1).next(i -> i + 1).to(3).take(5), equalTo(Seqs.newMutableSeq(1, 2, 3)));
Helpers.assertThrows(UnsupportedOperationException.class, () -> new Range<>(1).spliterator());
}
@Test
public void testForEach() {
List<Integer> list = new ArrayList<>();
new Range<>(1).to(64).next(i -> i + i).forEach(e -> list.add(e));
assertThat(list, equalTo(Arrays.asList(1, 2, 4, 8, 16, 32, 64)));
list.clear();
new Range<>(1).until(64).next(i -> i + i).forEach(e -> list.add(e));
assertThat(list, equalTo(Arrays.asList(1, 2, 4, 8, 16, 32)));
list.clear();
new Range<>(64).to(1).next(i -> i / 2).forEach(e -> list.add(e));
assertThat(list, equalTo(Arrays.asList(64, 32, 16, 8, 4, 2, 1)));
list.clear();
new Range<>(1).to(1).next(i -> i + i).forEach(e -> list.add(e));
assertThat(list, equalTo(Arrays.asList(1)));
list.clear();
new Range<>(1).until(1).next(i -> i + i).forEach(e -> list.add(e));
assertThat(list, equalTo(Collections.emptyList()));
list.clear();
List<Integer> indices = new ArrayList<>();
new Range<>(1)
.until(64)
.next(i -> i + i)
.forEach(
(e, i) -> {
list.add(e);
indices.add(i);
});
assertThat(list, equalTo(Arrays.asList(1, 2, 4, 8, 16, 32)));
assertThat(indices, equalTo(Arrays.asList(0, 1, 2, 3, 4, 5)));
list.clear();
new Range<>(1).to(720).next((c, i) -> c * (i + 2)).forEach(e -> list.add(e));
assertThat(list, equalTo(Arrays.asList(1, 2, 6, 24, 120, 720)));
list.clear();
new Range<>(1).to(5).next(i -> i + 1).next((c, i) -> c * (i + 2)).forEach(e -> list.add(e));
assertThat(list, equalTo(Arrays.asList(1, 2, 3, 4, 5)));
list.clear();
Helpers.assertThrows(
NullPointerException.class, () -> new Range<>(1).to(10).forEach(e -> list.add(e)));
}
@Test
public void testFrom() {
assertThat(new Range<>(1).from(2).getFrom(), is(2));
Helpers.assertThrows(NullPointerException.class, () -> new Range<>("").from(null));
}
@Test
public void testSpliterator() {
Helpers.assertThrows(
IllegalArgumentException.class, () -> new Range<>(1).next(i -> i + 1).take(-1));
}