diff options
Diffstat (limited to 'library/alloc/src/collections/btree/map/tests.rs')
-rw-r--r-- | library/alloc/src/collections/btree/map/tests.rs | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/library/alloc/src/collections/btree/map/tests.rs b/library/alloc/src/collections/btree/map/tests.rs index 700b1463b..76c2f27b4 100644 --- a/library/alloc/src/collections/btree/map/tests.rs +++ b/library/alloc/src/collections/btree/map/tests.rs @@ -2336,3 +2336,52 @@ fn from_array() { let unordered_duplicates = BTreeMap::from([(3, 4), (1, 2), (1, 2)]); assert_eq!(map, unordered_duplicates); } + +#[test] +fn test_cursor() { + let map = BTreeMap::from([(1, 'a'), (2, 'b'), (3, 'c')]); + + let mut cur = map.lower_bound(Bound::Unbounded); + assert_eq!(cur.key(), Some(&1)); + cur.move_next(); + assert_eq!(cur.key(), Some(&2)); + assert_eq!(cur.peek_next(), Some((&3, &'c'))); + cur.move_prev(); + assert_eq!(cur.key(), Some(&1)); + assert_eq!(cur.peek_prev(), None); + + let mut cur = map.upper_bound(Bound::Excluded(&1)); + assert_eq!(cur.key(), None); + cur.move_next(); + assert_eq!(cur.key(), Some(&1)); + cur.move_prev(); + assert_eq!(cur.key(), None); + assert_eq!(cur.peek_prev(), Some((&3, &'c'))); +} + +#[test] +fn test_cursor_mut() { + let mut map = BTreeMap::from([(1, 'a'), (3, 'c'), (5, 'e')]); + let mut cur = map.lower_bound_mut(Bound::Excluded(&3)); + assert_eq!(cur.key(), Some(&5)); + cur.insert_before(4, 'd'); + assert_eq!(cur.key(), Some(&5)); + assert_eq!(cur.peek_prev(), Some((&4, &mut 'd'))); + cur.move_next(); + assert_eq!(cur.key(), None); + cur.insert_before(6, 'f'); + assert_eq!(cur.key(), None); + assert_eq!(cur.remove_current(), None); + assert_eq!(cur.key(), None); + cur.insert_after(0, '?'); + assert_eq!(cur.key(), None); + assert_eq!(map, BTreeMap::from([(0, '?'), (1, 'a'), (3, 'c'), (4, 'd'), (5, 'e'), (6, 'f')])); + + let mut cur = map.upper_bound_mut(Bound::Included(&5)); + assert_eq!(cur.key(), Some(&5)); + assert_eq!(cur.remove_current(), Some((5, 'e'))); + assert_eq!(cur.key(), Some(&6)); + assert_eq!(cur.remove_current_and_move_back(), Some((6, 'f'))); + assert_eq!(cur.key(), Some(&4)); + assert_eq!(map, BTreeMap::from([(0, '?'), (1, 'a'), (3, 'c'), (4, 'd')])); +} |