buffer: fix missing null/undefined check

The new implementation of Buffer missed the check for null/undefined as
the first argument to new Buffer(). Reintroduce the check and add test.

Fix: e8734c0 "buffer: implement Uint8Array backed Buffer"
Fix: https://github.com/nodejs/io.js/issues/2194
PR-URL: https://github.com/nodejs/io.js/pull/2195
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/test/parallel/test-buffer.js b/test/parallel/test-buffer.js
index 3daa02eac7..d5013c3552 100644
--- a/test/parallel/test-buffer.js
+++ b/test/parallel/test-buffer.js
@@ -1181,3 +1181,11 @@ Buffer.poolSize = ps;
 assert.throws(function() {
   Buffer(10).copy();
 });
+
+assert.throws(function() {
+  new Buffer();
+}, /must start with number, buffer, array or string/);
+
+assert.throws(function() {
+  new Buffer(null);
+}, /must start with number, buffer, array or string/);