Test the whole chunks instead of just an element in the chunks/chunks…

…_mut tests

Easy enough to do and ensures that the whole chunk is as expected
instead of just the element that was looked at before.

src/libcore/tests/slice.rs

@@ -117,12 +117,12 @@ fn test_chunks_count() {
 fn test_chunks_nth() {
     let v: &[i32] = &[0, 1, 2, 3, 4, 5];
     let mut c = v.chunks(2);
-    assert_eq!(c.nth(1).unwrap()[1], 3);
-    assert_eq!(c.next().unwrap()[0], 4);
+    assert_eq!(c.nth(1).unwrap(), &[2, 3]);
+    assert_eq!(c.next().unwrap(), &[4, 5]);
 
     let v2: &[i32] = &[0, 1, 2, 3, 4];
     let mut c2 = v2.chunks(3);
-    assert_eq!(c2.nth(1).unwrap()[1], 4);
+    assert_eq!(c2.nth(1).unwrap(), &[3, 4]);
     assert_eq!(c2.next(), None);
 }
 
@@ -168,24 +168,24 @@ fn test_chunks_mut_count() {
 fn test_chunks_mut_nth() {
     let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
     let mut c = v.chunks_mut(2);
-    assert_eq!(c.nth(1).unwrap()[1], 3);
-    assert_eq!(c.next().unwrap()[0], 4);
+    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];
     let mut c2 = v2.chunks_mut(3);
-    assert_eq!(c2.nth(1).unwrap()[1], 4);
+    assert_eq!(c2.nth(1).unwrap(), &[3, 4]);
     assert_eq!(c2.next(), None);
 }
 
 #[test]
 fn test_chunks_mut_last() {
     let v: &mut [i32] = &mut [0, 1, 2, 3, 4, 5];
     let c = v.chunks_mut(2);
-    assert_eq!(c.last().unwrap()[1], 5);
+    assert_eq!(c.last().unwrap(), &[4, 5]);
 
     let v2: &mut [i32] = &mut [0, 1, 2, 3, 4];
     let c2 = v2.chunks_mut(2);
-    assert_eq!(c2.last().unwrap()[0], 4);
+    assert_eq!(c2.last().unwrap(), &[4]);
 }
 
 #[test]