From 698f8c2f01ea549d77d7dc3338a12e04c11057b9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 17 Apr 2024 14:02:58 +0200 Subject: Adding upstream version 1.64.0+dfsg1. Signed-off-by: Daniel Baumann --- library/core/tests/iter/adapters/fuse.rs | 75 ++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 library/core/tests/iter/adapters/fuse.rs (limited to 'library/core/tests/iter/adapters/fuse.rs') diff --git a/library/core/tests/iter/adapters/fuse.rs b/library/core/tests/iter/adapters/fuse.rs new file mode 100644 index 000000000..f41b379b3 --- /dev/null +++ b/library/core/tests/iter/adapters/fuse.rs @@ -0,0 +1,75 @@ +use core::iter::*; + +#[test] +fn test_fuse_nth() { + let xs = [0, 1, 2]; + let mut it = xs.iter(); + + assert_eq!(it.len(), 3); + assert_eq!(it.nth(2), Some(&2)); + assert_eq!(it.len(), 0); + assert_eq!(it.nth(2), None); + assert_eq!(it.len(), 0); +} + +#[test] +fn test_fuse_last() { + let xs = [0, 1, 2]; + let it = xs.iter(); + + assert_eq!(it.len(), 3); + assert_eq!(it.last(), Some(&2)); +} + +#[test] +fn test_fuse_count() { + let xs = [0, 1, 2]; + let it = xs.iter(); + + assert_eq!(it.len(), 3); + assert_eq!(it.count(), 3); + // Can't check len now because count consumes. +} + +#[test] +fn test_fuse_fold() { + let xs = [0, 1, 2]; + let it = xs.iter(); // `FusedIterator` + let i = it.fuse().fold(0, |i, &x| { + assert_eq!(x, xs[i]); + i + 1 + }); + assert_eq!(i, xs.len()); + + let it = xs.iter(); // `FusedIterator` + let i = it.fuse().rfold(xs.len(), |i, &x| { + assert_eq!(x, xs[i - 1]); + i - 1 + }); + assert_eq!(i, 0); + + let it = xs.iter().scan((), |_, &x| Some(x)); // `!FusedIterator` + let i = it.fuse().fold(0, |i, x| { + assert_eq!(x, xs[i]); + i + 1 + }); + assert_eq!(i, xs.len()); +} + +#[test] +fn test_fuse() { + let mut it = 0..3; + assert_eq!(it.len(), 3); + assert_eq!(it.next(), Some(0)); + assert_eq!(it.len(), 2); + assert_eq!(it.next(), Some(1)); + assert_eq!(it.len(), 1); + assert_eq!(it.next(), Some(2)); + assert_eq!(it.len(), 0); + assert_eq!(it.next(), None); + assert_eq!(it.len(), 0); + assert_eq!(it.next(), None); + assert_eq!(it.len(), 0); + assert_eq!(it.next(), None); + assert_eq!(it.len(), 0); +} -- cgit v1.2.3