diff options
Diffstat (limited to 'library/core/tests/iter/adapters/inspect.rs')
-rw-r--r-- | library/core/tests/iter/adapters/inspect.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/library/core/tests/iter/adapters/inspect.rs b/library/core/tests/iter/adapters/inspect.rs new file mode 100644 index 000000000..939e3a28a --- /dev/null +++ b/library/core/tests/iter/adapters/inspect.rs @@ -0,0 +1,38 @@ +use core::iter::*; + +#[test] +fn test_inspect() { + let xs = [1, 2, 3, 4]; + let mut n = 0; + + let ys = xs.iter().cloned().inspect(|_| n += 1).collect::<Vec<usize>>(); + + assert_eq!(n, xs.len()); + assert_eq!(&xs[..], &ys[..]); +} + +#[test] +fn test_inspect_fold() { + let xs = [1, 2, 3, 4]; + let mut n = 0; + { + let it = xs.iter().inspect(|_| n += 1); + let i = it.fold(0, |i, &x| { + assert_eq!(x, xs[i]); + i + 1 + }); + assert_eq!(i, xs.len()); + } + assert_eq!(n, xs.len()); + + let mut n = 0; + { + let it = xs.iter().inspect(|_| n += 1); + let i = it.rfold(xs.len(), |i, &x| { + assert_eq!(x, xs[i - 1]); + i - 1 + }); + assert_eq!(i, 0); + } + assert_eq!(n, xs.len()); +} |