1 use super::super::testing::crash_test::{CrashTestDummy, Panic};
2 use super::super::testing::rng::DeterministicRng;
5 use std::cmp::Ordering;
6 use std::hash::{Hash, Hasher};
7 use std::iter::FromIterator;
8 use std::panic::{catch_unwind, AssertUnwindSafe};
12 let mut m = BTreeSet::new();
17 assert_eq!(m.clone(), m);
21 fn test_iter_min_max() {
22 let mut a = BTreeSet::new();
23 assert_eq!(a.iter().min(), None);
24 assert_eq!(a.iter().max(), None);
25 assert_eq!(a.range(..).min(), None);
26 assert_eq!(a.range(..).max(), None);
27 assert_eq!(a.difference(&BTreeSet::new()).min(), None);
28 assert_eq!(a.difference(&BTreeSet::new()).max(), None);
29 assert_eq!(a.intersection(&a).min(), None);
30 assert_eq!(a.intersection(&a).max(), None);
31 assert_eq!(a.symmetric_difference(&BTreeSet::new()).min(), None);
32 assert_eq!(a.symmetric_difference(&BTreeSet::new()).max(), None);
33 assert_eq!(a.union(&a).min(), None);
34 assert_eq!(a.union(&a).max(), None);
37 assert_eq!(a.iter().min(), Some(&1));
38 assert_eq!(a.iter().max(), Some(&2));
39 assert_eq!(a.range(..).min(), Some(&1));
40 assert_eq!(a.range(..).max(), Some(&2));
41 assert_eq!(a.difference(&BTreeSet::new()).min(), Some(&1));
42 assert_eq!(a.difference(&BTreeSet::new()).max(), Some(&2));
43 assert_eq!(a.intersection(&a).min(), Some(&1));
44 assert_eq!(a.intersection(&a).max(), Some(&2));
45 assert_eq!(a.symmetric_difference(&BTreeSet::new()).min(), Some(&1));
46 assert_eq!(a.symmetric_difference(&BTreeSet::new()).max(), Some(&2));
47 assert_eq!(a.union(&a).min(), Some(&1));
48 assert_eq!(a.union(&a).max(), Some(&2));
51 fn check<F>(a: &[i32], b: &[i32], expected: &[i32], f: F)
53 F: FnOnce(&BTreeSet<i32>, &BTreeSet<i32>, &mut dyn FnMut(&i32) -> bool) -> bool,
55 let mut set_a = BTreeSet::new();
56 let mut set_b = BTreeSet::new();
59 assert!(set_a.insert(*x))
62 assert!(set_b.insert(*y))
66 f(&set_a, &set_b, &mut |&x| {
67 if i < expected.len() {
68 assert_eq!(x, expected[i]);
73 assert_eq!(i, expected.len());
77 fn test_intersection() {
78 fn check_intersection(a: &[i32], b: &[i32], expected: &[i32]) {
79 check(a, b, expected, |x, y, f| x.intersection(y).all(f))
82 check_intersection(&[], &[], &[]);
83 check_intersection(&[1, 2, 3], &[], &[]);
84 check_intersection(&[], &[1, 2, 3], &[]);
85 check_intersection(&[2], &[1, 2, 3], &[2]);
86 check_intersection(&[1, 2, 3], &[2], &[2]);
87 check_intersection(&[11, 1, 3, 77, 103, 5, -5], &[2, 11, 77, -9, -42, 5, 3], &[3, 5, 11, 77]);
94 let large = Vec::from_iter(0..100);
95 check_intersection(&[], &large, &[]);
96 check_intersection(&large, &[], &[]);
97 check_intersection(&[-1], &large, &[]);
98 check_intersection(&large, &[-1], &[]);
99 check_intersection(&[0], &large, &[0]);
100 check_intersection(&large, &[0], &[0]);
101 check_intersection(&[99], &large, &[99]);
102 check_intersection(&large, &[99], &[99]);
103 check_intersection(&[100], &large, &[]);
104 check_intersection(&large, &[100], &[]);
105 check_intersection(&[11, 5000, 1, 3, 77, 8924], &large, &[1, 3, 11, 77]);
109 fn test_intersection_size_hint() {
110 let x = BTreeSet::from([3, 4]);
111 let y = BTreeSet::from([1, 2, 3]);
112 let mut iter = x.intersection(&y);
113 assert_eq!(iter.size_hint(), (1, Some(1)));
114 assert_eq!(iter.next(), Some(&3));
115 assert_eq!(iter.size_hint(), (0, Some(0)));
116 assert_eq!(iter.next(), None);
118 iter = y.intersection(&y);
119 assert_eq!(iter.size_hint(), (0, Some(3)));
120 assert_eq!(iter.next(), Some(&1));
121 assert_eq!(iter.size_hint(), (0, Some(2)));
125 fn test_difference() {
126 fn check_difference(a: &[i32], b: &[i32], expected: &[i32]) {
127 check(a, b, expected, |x, y, f| x.difference(y).all(f))
130 check_difference(&[], &[], &[]);
131 check_difference(&[1, 12], &[], &[1, 12]);
132 check_difference(&[], &[1, 2, 3, 9], &[]);
133 check_difference(&[1, 3, 5, 9, 11], &[3, 9], &[1, 5, 11]);
134 check_difference(&[1, 3, 5, 9, 11], &[3, 6, 9], &[1, 5, 11]);
135 check_difference(&[1, 3, 5, 9, 11], &[0, 1], &[3, 5, 9, 11]);
136 check_difference(&[1, 3, 5, 9, 11], &[11, 12], &[1, 3, 5, 9]);
138 &[-5, 11, 22, 33, 40, 42],
139 &[-12, -5, 14, 23, 34, 38, 39, 50],
140 &[11, 22, 33, 40, 42],
148 let large = Vec::from_iter(0..100);
149 check_difference(&[], &large, &[]);
150 check_difference(&[-1], &large, &[-1]);
151 check_difference(&[0], &large, &[]);
152 check_difference(&[99], &large, &[]);
153 check_difference(&[100], &large, &[100]);
154 check_difference(&[11, 5000, 1, 3, 77, 8924], &large, &[5000, 8924]);
155 check_difference(&large, &[], &large);
156 check_difference(&large, &[-1], &large);
157 check_difference(&large, &[100], &large);
161 fn test_difference_size_hint() {
162 let s246 = BTreeSet::from([2, 4, 6]);
163 let s23456 = BTreeSet::from_iter(2..=6);
164 let mut iter = s246.difference(&s23456);
165 assert_eq!(iter.size_hint(), (0, Some(3)));
166 assert_eq!(iter.next(), None);
168 let s12345 = BTreeSet::from_iter(1..=5);
169 iter = s246.difference(&s12345);
170 assert_eq!(iter.size_hint(), (0, Some(3)));
171 assert_eq!(iter.next(), Some(&6));
172 assert_eq!(iter.size_hint(), (0, Some(0)));
173 assert_eq!(iter.next(), None);
175 let s34567 = BTreeSet::from_iter(3..=7);
176 iter = s246.difference(&s34567);
177 assert_eq!(iter.size_hint(), (0, Some(3)));
178 assert_eq!(iter.next(), Some(&2));
179 assert_eq!(iter.size_hint(), (0, Some(2)));
180 assert_eq!(iter.next(), None);
182 let s1 = BTreeSet::from_iter(-9..=1);
183 iter = s246.difference(&s1);
184 assert_eq!(iter.size_hint(), (3, Some(3)));
186 let s2 = BTreeSet::from_iter(-9..=2);
187 iter = s246.difference(&s2);
188 assert_eq!(iter.size_hint(), (2, Some(2)));
189 assert_eq!(iter.next(), Some(&4));
190 assert_eq!(iter.size_hint(), (1, Some(1)));
192 let s23 = BTreeSet::from([2, 3]);
193 iter = s246.difference(&s23);
194 assert_eq!(iter.size_hint(), (1, Some(3)));
195 assert_eq!(iter.next(), Some(&4));
196 assert_eq!(iter.size_hint(), (1, Some(1)));
198 let s4 = BTreeSet::from([4]);
199 iter = s246.difference(&s4);
200 assert_eq!(iter.size_hint(), (2, Some(3)));
201 assert_eq!(iter.next(), Some(&2));
202 assert_eq!(iter.size_hint(), (1, Some(2)));
203 assert_eq!(iter.next(), Some(&6));
204 assert_eq!(iter.size_hint(), (0, Some(0)));
205 assert_eq!(iter.next(), None);
207 let s56 = BTreeSet::from([5, 6]);
208 iter = s246.difference(&s56);
209 assert_eq!(iter.size_hint(), (1, Some(3)));
210 assert_eq!(iter.next(), Some(&2));
211 assert_eq!(iter.size_hint(), (0, Some(2)));
213 let s6 = BTreeSet::from_iter(6..=19);
214 iter = s246.difference(&s6);
215 assert_eq!(iter.size_hint(), (2, Some(2)));
216 assert_eq!(iter.next(), Some(&2));
217 assert_eq!(iter.size_hint(), (1, Some(1)));
219 let s7 = BTreeSet::from_iter(7..=19);
220 iter = s246.difference(&s7);
221 assert_eq!(iter.size_hint(), (3, Some(3)));
225 fn test_symmetric_difference() {
226 fn check_symmetric_difference(a: &[i32], b: &[i32], expected: &[i32]) {
227 check(a, b, expected, |x, y, f| x.symmetric_difference(y).all(f))
230 check_symmetric_difference(&[], &[], &[]);
231 check_symmetric_difference(&[1, 2, 3], &[2], &[1, 3]);
232 check_symmetric_difference(&[2], &[1, 2, 3], &[1, 3]);
233 check_symmetric_difference(&[1, 3, 5, 9, 11], &[-2, 3, 9, 14, 22], &[-2, 1, 5, 11, 14, 22]);
237 fn test_symmetric_difference_size_hint() {
238 let x = BTreeSet::from([2, 4]);
239 let y = BTreeSet::from([1, 2, 3]);
240 let mut iter = x.symmetric_difference(&y);
241 assert_eq!(iter.size_hint(), (0, Some(5)));
242 assert_eq!(iter.next(), Some(&1));
243 assert_eq!(iter.size_hint(), (0, Some(4)));
244 assert_eq!(iter.next(), Some(&3));
245 assert_eq!(iter.size_hint(), (0, Some(1)));
250 fn check_union(a: &[i32], b: &[i32], expected: &[i32]) {
251 check(a, b, expected, |x, y, f| x.union(y).all(f))
254 check_union(&[], &[], &[]);
255 check_union(&[1, 2, 3], &[2], &[1, 2, 3]);
256 check_union(&[2], &[1, 2, 3], &[1, 2, 3]);
258 &[1, 3, 5, 9, 11, 16, 19, 24],
259 &[-2, 1, 5, 9, 13, 19],
260 &[-2, 1, 3, 5, 9, 11, 13, 16, 19, 24],
265 fn test_union_size_hint() {
266 let x = BTreeSet::from([2, 4]);
267 let y = BTreeSet::from([1, 2, 3]);
268 let mut iter = x.union(&y);
269 assert_eq!(iter.size_hint(), (3, Some(5)));
270 assert_eq!(iter.next(), Some(&1));
271 assert_eq!(iter.size_hint(), (2, Some(4)));
272 assert_eq!(iter.next(), Some(&2));
273 assert_eq!(iter.size_hint(), (1, Some(2)));
277 // Only tests the simple function definition with respect to intersection
278 fn test_is_disjoint() {
279 let one = BTreeSet::from([1]);
280 let two = BTreeSet::from([2]);
281 assert!(one.is_disjoint(&two));
285 // Also implicitly tests the trivial function definition of is_superset
286 fn test_is_subset() {
287 fn is_subset(a: &[i32], b: &[i32]) -> bool {
288 let set_a = BTreeSet::from_iter(a.iter());
289 let set_b = BTreeSet::from_iter(b.iter());
290 set_a.is_subset(&set_b)
293 assert_eq!(is_subset(&[], &[]), true);
294 assert_eq!(is_subset(&[], &[1, 2]), true);
295 assert_eq!(is_subset(&[0], &[1, 2]), false);
296 assert_eq!(is_subset(&[1], &[1, 2]), true);
297 assert_eq!(is_subset(&[2], &[1, 2]), true);
298 assert_eq!(is_subset(&[3], &[1, 2]), false);
299 assert_eq!(is_subset(&[1, 2], &[1]), false);
300 assert_eq!(is_subset(&[1, 2], &[1, 2]), true);
301 assert_eq!(is_subset(&[1, 2], &[2, 3]), false);
303 is_subset(&[-5, 11, 22, 33, 40, 42], &[-12, -5, 11, 14, 22, 23, 33, 34, 38, 39, 40, 42]),
306 assert_eq!(is_subset(&[-5, 11, 22, 33, 40, 42], &[-12, -5, 11, 14, 22, 23, 34, 38]), false);
313 let large = Vec::from_iter(0..100);
314 assert_eq!(is_subset(&[], &large), true);
315 assert_eq!(is_subset(&large, &[]), false);
316 assert_eq!(is_subset(&[-1], &large), false);
317 assert_eq!(is_subset(&[0], &large), true);
318 assert_eq!(is_subset(&[1, 2], &large), true);
319 assert_eq!(is_subset(&[99, 100], &large), false);
323 fn test_is_superset() {
324 fn is_superset(a: &[i32], b: &[i32]) -> bool {
325 let set_a = BTreeSet::from_iter(a.iter());
326 let set_b = BTreeSet::from_iter(b.iter());
327 set_a.is_superset(&set_b)
330 assert_eq!(is_superset(&[], &[]), true);
331 assert_eq!(is_superset(&[], &[1, 2]), false);
332 assert_eq!(is_superset(&[0], &[1, 2]), false);
333 assert_eq!(is_superset(&[1], &[1, 2]), false);
334 assert_eq!(is_superset(&[4], &[1, 2]), false);
335 assert_eq!(is_superset(&[1, 4], &[1, 2]), false);
336 assert_eq!(is_superset(&[1, 2], &[1, 2]), true);
337 assert_eq!(is_superset(&[1, 2, 3], &[1, 3]), true);
338 assert_eq!(is_superset(&[1, 2, 3], &[]), true);
339 assert_eq!(is_superset(&[-1, 1, 2, 3], &[-1, 3]), true);
346 let large = Vec::from_iter(0..100);
347 assert_eq!(is_superset(&[], &large), false);
348 assert_eq!(is_superset(&large, &[]), true);
349 assert_eq!(is_superset(&large, &[1]), true);
350 assert_eq!(is_superset(&large, &[50, 99]), true);
351 assert_eq!(is_superset(&large, &[100]), false);
352 assert_eq!(is_superset(&large, &[0, 99]), true);
353 assert_eq!(is_superset(&[-1], &large), false);
354 assert_eq!(is_superset(&[0], &large), false);
355 assert_eq!(is_superset(&[99, 100], &large), false);
360 let mut set = BTreeSet::from([1, 2, 3, 4, 5, 6]);
361 set.retain(|&k| k % 2 == 0);
362 assert_eq!(set.len(), 3);
363 assert!(set.contains(&2));
364 assert!(set.contains(&4));
365 assert!(set.contains(&6));
369 fn test_drain_filter() {
370 let mut x = BTreeSet::from([1]);
371 let mut y = BTreeSet::from([1]);
373 x.drain_filter(|_| true);
374 y.drain_filter(|_| false);
375 assert_eq!(x.len(), 0);
376 assert_eq!(y.len(), 1);
380 fn test_drain_filter_drop_panic_leak() {
381 let a = CrashTestDummy::new(0);
382 let b = CrashTestDummy::new(1);
383 let c = CrashTestDummy::new(2);
384 let mut set = BTreeSet::new();
385 set.insert(a.spawn(Panic::Never));
386 set.insert(b.spawn(Panic::InDrop));
387 set.insert(c.spawn(Panic::Never));
389 catch_unwind(move || drop(set.drain_filter(|dummy| dummy.query(true)))).ok();
391 assert_eq!(a.queried(), 1);
392 assert_eq!(b.queried(), 1);
393 assert_eq!(c.queried(), 0);
394 assert_eq!(a.dropped(), 1);
395 assert_eq!(b.dropped(), 1);
396 assert_eq!(c.dropped(), 1);
400 fn test_drain_filter_pred_panic_leak() {
401 let a = CrashTestDummy::new(0);
402 let b = CrashTestDummy::new(1);
403 let c = CrashTestDummy::new(2);
404 let mut set = BTreeSet::new();
405 set.insert(a.spawn(Panic::Never));
406 set.insert(b.spawn(Panic::InQuery));
407 set.insert(c.spawn(Panic::InQuery));
409 catch_unwind(AssertUnwindSafe(|| drop(set.drain_filter(|dummy| dummy.query(true))))).ok();
411 assert_eq!(a.queried(), 1);
412 assert_eq!(b.queried(), 1);
413 assert_eq!(c.queried(), 0);
414 assert_eq!(a.dropped(), 1);
415 assert_eq!(b.dropped(), 0);
416 assert_eq!(c.dropped(), 0);
417 assert_eq!(set.len(), 2);
418 assert_eq!(set.first().unwrap().id(), 1);
419 assert_eq!(set.last().unwrap().id(), 2);
424 let mut x = BTreeSet::new();
428 assert!(x.is_empty());
432 let mut x = BTreeSet::new();
433 assert!(x.is_empty());
440 assert_eq!(x.remove(&2), true);
441 assert_eq!(x.remove(&0), false);
442 assert_eq!(x.remove(&5), false);
443 assert_eq!(x.remove(&1), true);
444 assert_eq!(x.remove(&2), false);
445 assert_eq!(x.remove(&3), true);
446 assert_eq!(x.remove(&4), true);
447 assert_eq!(x.remove(&4), false);
448 assert!(x.is_empty());
453 let mut x = BTreeSet::new();
458 let mut y = BTreeSet::new();
464 let mut z = x.iter().zip(&y);
466 assert_eq!(z.next().unwrap(), (&5, &("bar")));
467 assert_eq!(z.next().unwrap(), (&11, &("foo")));
468 assert!(z.next().is_none());
472 fn test_from_iter() {
473 let xs = [1, 2, 3, 4, 5, 6, 7, 8, 9];
475 let set = BTreeSet::from_iter(xs.iter());
478 assert!(set.contains(x));
484 let mut set = BTreeSet::new();
485 let empty = BTreeSet::<i32>::new();
490 let set_str = format!("{set:?}");
492 assert_eq!(set_str, "{1, 2}");
493 assert_eq!(format!("{empty:?}"), "{}");
497 fn test_extend_ref() {
498 let mut a = BTreeSet::new();
501 a.extend(&[2, 3, 4]);
503 assert_eq!(a.len(), 4);
504 assert!(a.contains(&1));
505 assert!(a.contains(&2));
506 assert!(a.contains(&3));
507 assert!(a.contains(&4));
509 let mut b = BTreeSet::new();
515 assert_eq!(a.len(), 6);
516 assert!(a.contains(&1));
517 assert!(a.contains(&2));
518 assert!(a.contains(&3));
519 assert!(a.contains(&4));
520 assert!(a.contains(&5));
521 assert!(a.contains(&6));
527 struct Foo(&'static str, i32);
529 impl PartialEq for Foo {
530 fn eq(&self, other: &Self) -> bool {
537 impl PartialOrd for Foo {
538 fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
539 self.0.partial_cmp(&other.0)
544 fn cmp(&self, other: &Self) -> Ordering {
549 let mut s = BTreeSet::new();
550 assert_eq!(s.replace(Foo("a", 1)), None);
551 assert_eq!(s.len(), 1);
552 assert_eq!(s.replace(Foo("a", 2)), Some(Foo("a", 1)));
553 assert_eq!(s.len(), 1);
556 let mut it = s.iter();
557 assert_eq!(it.next(), Some(&Foo("a", 2)));
558 assert_eq!(it.next(), None);
561 assert_eq!(s.get(&Foo("a", 1)), Some(&Foo("a", 2)));
562 assert_eq!(s.take(&Foo("a", 1)), Some(Foo("a", 2)));
563 assert_eq!(s.len(), 0);
565 assert_eq!(s.get(&Foo("a", 1)), None);
566 assert_eq!(s.take(&Foo("a", 1)), None);
568 assert_eq!(s.iter().next(), None);
572 fn assert_covariance() {
573 fn set<'new>(v: BTreeSet<&'static str>) -> BTreeSet<&'new str> {
576 fn iter<'a, 'new>(v: Iter<'a, &'static str>) -> Iter<'a, &'new str> {
579 fn into_iter<'new>(v: IntoIter<&'static str>) -> IntoIter<&'new str> {
582 fn range<'a, 'new>(v: Range<'a, &'static str>) -> Range<'a, &'new str> {
585 // not applied to Difference, Intersection, SymmetricDifference, Union
590 fn set<T: Sync>(v: &BTreeSet<T>) -> impl Sync + '_ {
594 fn iter<T: Sync>(v: &BTreeSet<T>) -> impl Sync + '_ {
598 fn into_iter<T: Sync>(v: BTreeSet<T>) -> impl Sync {
602 fn range<T: Sync + Ord>(v: &BTreeSet<T>) -> impl Sync + '_ {
606 fn drain_filter<T: Sync + Ord>(v: &mut BTreeSet<T>) -> impl Sync + '_ {
607 v.drain_filter(|_| false)
610 fn difference<T: Sync + Ord>(v: &BTreeSet<T>) -> impl Sync + '_ {
614 fn intersection<T: Sync + Ord>(v: &BTreeSet<T>) -> impl Sync + '_ {
618 fn symmetric_difference<T: Sync + Ord>(v: &BTreeSet<T>) -> impl Sync + '_ {
619 v.symmetric_difference(&v)
622 fn union<T: Sync + Ord>(v: &BTreeSet<T>) -> impl Sync + '_ {
629 fn set<T: Send>(v: BTreeSet<T>) -> impl Send {
633 fn iter<T: Send + Sync>(v: &BTreeSet<T>) -> impl Send + '_ {
637 fn into_iter<T: Send>(v: BTreeSet<T>) -> impl Send {
641 fn range<T: Send + Sync + Ord>(v: &BTreeSet<T>) -> impl Send + '_ {
645 fn drain_filter<T: Send + Ord>(v: &mut BTreeSet<T>) -> impl Send + '_ {
646 v.drain_filter(|_| false)
649 fn difference<T: Send + Sync + Ord>(v: &BTreeSet<T>) -> impl Send + '_ {
653 fn intersection<T: Send + Sync + Ord>(v: &BTreeSet<T>) -> impl Send + '_ {
657 fn symmetric_difference<T: Send + Sync + Ord>(v: &BTreeSet<T>) -> impl Send + '_ {
658 v.symmetric_difference(&v)
661 fn union<T: Send + Sync + Ord>(v: &BTreeSet<T>) -> impl Send + '_ {
667 // Check that the member-like functions conditionally provided by #[derive()]
668 // are not overridden by genuine member functions with a different signature.
669 fn assert_derives() {
670 fn hash<T: Hash, H: Hasher>(v: BTreeSet<T>, state: &mut H) {
672 // Tested much more thoroughly outside the crate in btree_set_hash.rs
674 fn eq<T: PartialEq>(v: BTreeSet<T>) {
677 fn ne<T: PartialEq>(v: BTreeSet<T>) {
680 fn cmp<T: Ord>(v: BTreeSet<T>) {
683 fn min<T: Ord>(v: BTreeSet<T>, w: BTreeSet<T>) {
686 fn max<T: Ord>(v: BTreeSet<T>, w: BTreeSet<T>) {
689 fn clamp<T: Ord>(v: BTreeSet<T>, w: BTreeSet<T>, x: BTreeSet<T>) {
690 let _ = v.clamp(w, x);
692 fn partial_cmp<T: PartialOrd>(v: &BTreeSet<T>) {
693 let _ = v.partial_cmp(&v);
698 fn test_ord_absence() {
699 fn set<K>(mut set: BTreeSet<K>) {
700 let _ = set.is_empty();
704 let _ = set.into_iter();
707 fn set_debug<K: Debug>(set: BTreeSet<K>) {
709 format!("{:?}", set.iter());
710 format!("{:?}", set.into_iter());
713 fn set_clone<K: Clone>(mut set: BTreeSet<K>) {
714 set.clone_from(&set.clone());
717 #[derive(Debug, Clone)]
719 set(BTreeSet::<NonOrd>::new());
720 set_debug(BTreeSet::<NonOrd>::new());
721 set_clone(BTreeSet::<NonOrd>::default());
726 let mut a = BTreeSet::new();
731 let mut b = BTreeSet::new();
738 assert_eq!(a.len(), 5);
739 assert_eq!(b.len(), 0);
741 assert_eq!(a.contains(&1), true);
742 assert_eq!(a.contains(&2), true);
743 assert_eq!(a.contains(&3), true);
744 assert_eq!(a.contains(&4), true);
745 assert_eq!(a.contains(&5), true);
749 fn test_first_last() {
750 let mut a = BTreeSet::new();
751 assert_eq!(a.first(), None);
752 assert_eq!(a.last(), None);
754 assert_eq!(a.first(), Some(&1));
755 assert_eq!(a.last(), Some(&1));
757 assert_eq!(a.first(), Some(&1));
758 assert_eq!(a.last(), Some(&2));
762 assert_eq!(a.first(), Some(&1));
763 assert_eq!(a.last(), Some(&12));
764 assert_eq!(a.pop_first(), Some(1));
765 assert_eq!(a.pop_last(), Some(12));
766 assert_eq!(a.pop_first(), Some(2));
767 assert_eq!(a.pop_last(), Some(11));
768 assert_eq!(a.pop_first(), Some(3));
769 assert_eq!(a.pop_last(), Some(10));
770 assert_eq!(a.pop_first(), Some(4));
771 assert_eq!(a.pop_first(), Some(5));
772 assert_eq!(a.pop_first(), Some(6));
773 assert_eq!(a.pop_first(), Some(7));
774 assert_eq!(a.pop_first(), Some(8));
775 assert_eq!(a.clone().pop_last(), Some(9));
776 assert_eq!(a.pop_first(), Some(9));
777 assert_eq!(a.pop_first(), None);
778 assert_eq!(a.pop_last(), None);
781 // Unlike the function with the same name in map/tests, returns no values.
782 // Which also means it returns different predetermined pseudo-random keys,
783 // and the test cases using this function explore slightly different trees.
784 fn rand_data(len: usize) -> Vec<u32> {
785 let mut rng = DeterministicRng::new();
786 Vec::from_iter((0..len).map(|_| rng.next()))
790 fn test_split_off_empty_right() {
791 let mut data = rand_data(173);
793 let mut set = BTreeSet::from_iter(data.clone());
794 let right = set.split_off(&(data.iter().max().unwrap() + 1));
797 assert!(set.into_iter().eq(data));
798 assert!(right.into_iter().eq(None));
802 fn test_split_off_empty_left() {
803 let mut data = rand_data(314);
805 let mut set = BTreeSet::from_iter(data.clone());
806 let right = set.split_off(data.iter().min().unwrap());
809 assert!(set.into_iter().eq(None));
810 assert!(right.into_iter().eq(data));
814 fn test_split_off_large_random_sorted() {
816 let mut data = if cfg!(miri) { rand_data(529) } else { rand_data(1529) };
817 // special case with maximum height.
820 let mut set = BTreeSet::from_iter(data.clone());
821 let key = data[data.len() / 2];
822 let right = set.split_off(&key);
824 assert!(set.into_iter().eq(data.clone().into_iter().filter(|x| *x < key)));
825 assert!(right.into_iter().eq(data.into_iter().filter(|x| *x >= key)));
830 let set = BTreeSet::from([1, 2, 3, 4]);
831 let unordered_duplicates = BTreeSet::from([4, 1, 4, 3, 2]);
832 assert_eq!(set, unordered_duplicates);