Remove commented tests for Bytes::unsplit (#677)

Bytes doesn't have an unsplit method anymore. We can always retrieve
these from git history if necessary.

tests/test_bytes.rs

@@ -732,97 +732,6 @@ fn partial_eq_bytesmut() {
     assert!(bytesmut != bytes2);
 }
 
-/*
-#[test]
-fn bytes_unsplit_basic() {
-    let buf = Bytes::from(&b"aaabbbcccddd"[..]);
-
-    let splitted = buf.split_off(6);
-    assert_eq!(b"aaabbb", &buf[..]);
-    assert_eq!(b"cccddd", &splitted[..]);
-
-    buf.unsplit(splitted);
-    assert_eq!(b"aaabbbcccddd", &buf[..]);
-}
-
-#[test]
-fn bytes_unsplit_empty_other() {
-    let buf = Bytes::from(&b"aaabbbcccddd"[..]);
-
-    // empty other
-    let other = Bytes::new();
-
-    buf.unsplit(other);
-    assert_eq!(b"aaabbbcccddd", &buf[..]);
-}
-
-#[test]
-fn bytes_unsplit_empty_self() {
-    // empty self
-    let mut buf = Bytes::new();
-
-    let mut other = Bytes::with_capacity(64);
-    other.extend_from_slice(b"aaabbbcccddd");
-
-    buf.unsplit(other);
-    assert_eq!(b"aaabbbcccddd", &buf[..]);
-}
-
-#[test]
-fn bytes_unsplit_arc_different() {
-    let mut buf = Bytes::with_capacity(64);
-    buf.extend_from_slice(b"aaaabbbbeeee");
-
-    buf.split_off(8); //arc
-
-    let mut buf2 = Bytes::with_capacity(64);
-    buf2.extend_from_slice(b"ccccddddeeee");
-
-    buf2.split_off(8); //arc
-
-    buf.unsplit(buf2);
-    assert_eq!(b"aaaabbbbccccdddd", &buf[..]);
-}
-
-#[test]
-fn bytes_unsplit_arc_non_contiguous() {
-    let mut buf = Bytes::with_capacity(64);
-    buf.extend_from_slice(b"aaaabbbbeeeeccccdddd");
-
-    let mut buf2 = buf.split_off(8); //arc
-
-    let buf3 = buf2.split_off(4); //arc
-
-    buf.unsplit(buf3);
-    assert_eq!(b"aaaabbbbccccdddd", &buf[..]);
-}
-
-#[test]
-fn bytes_unsplit_two_split_offs() {
-    let mut buf = Bytes::with_capacity(64);
-    buf.extend_from_slice(b"aaaabbbbccccdddd");
-
-    let mut buf2 = buf.split_off(8); //arc
-    let buf3 = buf2.split_off(4); //arc
-
-    buf2.unsplit(buf3);
-    buf.unsplit(buf2);
-    assert_eq!(b"aaaabbbbccccdddd", &buf[..]);
-}
-
-#[test]
-fn bytes_unsplit_overlapping_references() {
-    let mut buf = Bytes::with_capacity(64);
-    buf.extend_from_slice(b"abcdefghijklmnopqrstuvwxyz");
-    let mut buf0010 = buf.slice(0..10);
-    let buf1020 = buf.slice(10..20);
-    let buf0515 = buf.slice(5..15);
-    buf0010.unsplit(buf1020);
-    assert_eq!(b"abcdefghijklmnopqrst", &buf0010[..]);
-    assert_eq!(b"fghijklmno", &buf0515[..]);
-}
-*/
-
 #[test]
 fn bytes_mut_unsplit_basic() {
     let mut buf = BytesMut::with_capacity(64);