test: remove test repetition

Remove loops executing the same tests multiple times.

PR-URL: https://github.com/nodejs/io.js/pull/1874
Reviewed-By: Trevor Norris <trev.norris@gmail.com>

test/parallel/test-buffer.js

@@ -271,7 +271,6 @@ assert.equal(writeTest.toString(), 'nodejs');
 
 var asciiString = 'hello world';
 var offset = 100;
-for (var j = 0; j < 500; j++) {
 
 for (var i = 0; i < asciiString.length; i++) {
   b[i] = asciiString.charCodeAt(i);
@@ -291,16 +290,13 @@ for (var j = 0; j < 500; j++) {
 }
 
 // TODO utf8 slice tests
-}
 
 
-for (var j = 0; j < 100; j++) {
 var slice = b.slice(100, 150);
 assert.equal(50, slice.length);
 for (var i = 0; i < 50; i++) {
   assert.equal(b[100 + i], slice[i]);
 }
-}
 
 
 // make sure only top level parent propagates from allocPool