Add unit tests for exact_chunks/exact_chunks_mut

These are basically modified copies of the chunks/chunks_mut tests.

2 files changed, 105 insertions, 0 deletions

diff --git a/src/libcore/tests/lib.rs b/src/libcore/tests/lib.rs
index c4b85b82981..2c0009569d7 100644
--- a/src/libcore/tests/lib.rs
+++ b/src/libcore/tests/lib.rs
@@ -42,6 +42,7 @@
 #![feature(try_from)]
 #![feature(try_trait)]
 #![feature(unique)]
+#![feature(exact_chunks)]
 
 extern crate core;
 extern crate test;
diff --git a/src/libcore/tests/slice.rs b/src/libcore/tests/slice.rs
index 4f9fc30785c..a89a88ac0af 100644
--- a/src/libcore/tests/slice.rs
+++ b/src/libcore/tests/slice.rs
@@ -203,6 +203,110 @@ fn test_chunks_mut_zip() {
 }
 
 #[test]
+fn test_exact_chunks_count() {
+    let v: &[i32] = &[0, 1, 2, 3, 4, 5];
+    let c = v.exact_chunks(3);
+    assert_eq!(c.count(), 2);
+
+    let v2: &[i32] = &[0, 1, 2, 3, 4];
+    let c2 = v2.exact_chunks(2);
+    assert_eq!(c2.count(), 2);
+
+    let v3: &[i32] = &[];
+    let c3 = v3.exact_chunks(2);
+    assert_eq!(c3.count(), 0);
+}
+
+#[test]
+fn test_exact_chunks_nth() {
+    let v: &[i32] = &[0, 1, 2, 3, 4, 5];
+    let mut c = v.exact_chunks(2);
+    assert_eq!(c.nth(1).unwrap(), &[2, 3]);
+    assert_eq!(c.next().unwrap(), &[4, 5]);
+
+    let v2: &[i32] = &[0, 1, 2, 3, 4, 5, 6];
+    let mut c2 = v2.exact_chunks(3);
+    assert_eq!(c2.nth(1).unwrap(), &[3, 4, 5]);
+    assert_eq!(c2.next(), None);
+}
+
+#[test]
+fn test_exact_chunks_last() {
+    let v: &[i32] = &[0, 1, 2, 3, 4, 5];
+    let c = v.exact_chunks(2);
+    assert_eq!(c.last().unwrap(), &[4, 5]);
+
+    let v2: &[i32] = &[0, 1, 2, 3, 4];
+    let c2 = v2.exact_chunks(2);
+    assert_eq!(c2.last().unwrap(), &[2, 3]);
+}
+
+#[test]
+fn test_exact_chunks_zip() {
+    let v1: &[i32] = &[0, 1, 2, 3, 4];
+    let v2: &[i32] = &[6, 7, 8, 9, 10];
+
+    let res = v1.exact_chunks(2)
+        .zip(v2.exact_chunks(2))
+        .map(|(a, b)| a.iter().sum::<i32>() + b.iter().sum::<i32>())
+        .collect::<Vec<_>>();
+    assert_eq!(res, vec![14, 22]);
+}
+
+#[test]
+fn test_exact_chunks_mut_count() {
+    let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
+    let c = v.exact_chunks_mut(3);
+    assert_eq!(c.count(), 2);
+
+    let v2: &mut [i32] = &mut [0, 1, 2, 3, 4];
+    let c2 = v2.exact_chunks_mut(2);
+    assert_eq!(c2.count(), 2);
+
+    let v3: &mut [i32] = &mut [];
+    let c3 = v3.exact_chunks_mut(2);
+    assert_eq!(c3.count(), 0);
+}
+
+#[test]
+fn test_exact_chunks_mut_nth() {
+    let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
+    let mut c = v.exact_chunks_mut(2);
+    assert_eq!(c.nth(1).unwrap(), &[2, 3]);
+    assert_eq!(c.next().unwrap(), &[4, 5]);
+
+    let v2: &mut [i32] = &mut [0, 1, 2, 3, 4, 5, 6];
+    let mut c2 = v2.exact_chunks_mut(3);
+    assert_eq!(c2.nth(1).unwrap(), &[3, 4, 5]);
+    assert_eq!(c2.next(), None);
+}
+
+#[test]
+fn test_exact_chunks_mut_last() {
+    let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
+    let c = v.exact_chunks_mut(2);
+    assert_eq!(c.last().unwrap(), &[4, 5]);
+
+    let v2: &mut [i32] = &mut [0, 1, 2, 3, 4];
+    let c2 = v2.exact_chunks_mut(2);
+    assert_eq!(c2.last().unwrap(), &[2, 3]);
+}
+
+#[test]
+fn test_exact_chunks_mut_zip() {
+    let v1: &mut [i32] = &mut [0, 1, 2, 3, 4];
+    let v2: &[i32] = &[6, 7, 8, 9, 10];
+
+    for (a, b) in v1.exact_chunks_mut(2).zip(v2.exact_chunks(2)) {
+        let sum = b.iter().sum::<i32>();
+        for v in a {
+            *v += sum;
+        }
+    }
+    assert_eq!(v1, [13, 14, 19, 20, 4]);
+}
+
+#[test]
 fn test_windows_count() {
     let v: &[i32] = &[0, 1, 2, 3, 4, 5];
     let c = v.windows(3);