diff options
Diffstat (limited to 'library/core/tests/iter/adapters/map.rs')
-rw-r--r-- | library/core/tests/iter/adapters/map.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/library/core/tests/iter/adapters/map.rs b/library/core/tests/iter/adapters/map.rs new file mode 100644 index 000000000..77ce3819b --- /dev/null +++ b/library/core/tests/iter/adapters/map.rs @@ -0,0 +1,27 @@ +use core::iter::*; + +#[test] +fn test_map_try_folds() { + let f = &|acc, x| i32::checked_add(2 * acc, x); + assert_eq!((0..10).map(|x| x + 3).try_fold(7, f), (3..13).try_fold(7, f)); + assert_eq!((0..10).map(|x| x + 3).try_rfold(7, f), (3..13).try_rfold(7, f)); + + let mut iter = (0..40).map(|x| x + 10); + assert_eq!(iter.try_fold(0, i8::checked_add), None); + assert_eq!(iter.next(), Some(20)); + assert_eq!(iter.try_rfold(0, i8::checked_add), None); + assert_eq!(iter.next_back(), Some(46)); +} + +#[test] +fn test_double_ended_map() { + let xs = [1, 2, 3, 4, 5, 6]; + let mut it = xs.iter().map(|&x| x * -1); + assert_eq!(it.next(), Some(-1)); + assert_eq!(it.next(), Some(-2)); + assert_eq!(it.next_back(), Some(-6)); + assert_eq!(it.next_back(), Some(-5)); + assert_eq!(it.next(), Some(-3)); + assert_eq!(it.next_back(), Some(-4)); + assert_eq!(it.next(), None); +} |