update tests to use Buffer.from

Using Buffer without new will soon stop working. It will throw
A deprecation warning in Node v7. This commit modifies the tests
in `test/bare.js` and `test/bare_shebang.js` to use the
`Buffer.from` interface instead. It is a drop in replacement for
Buffer that is supported by Node v4 / v6 and Browserify's Buffer
implementation

For the browserify test suite to pass on Node v7 we will need
to land this commit as well as the two below PR's

* browserify/browser-pack#75
* max-mapper/concat-stream#48

Author: Myles Borins

test.js

@@ -16,13 +16,17 @@ test('bare', function (t) {
     ]);
     ps.stdout.pipe(concat(function (body) {
         vm.runInNewContext(body, {
-            Buffer: function (s) { return s.toLowerCase() },
+            Buffer: {
+              from: function (s) { return s.toLowerCase() }
+            },
             console: {
                 log: function (msg) { t.equal(msg, 'abc') }
             }
         });
         vm.runInNewContext(body, {
-            Buffer: Buffer,
+            Buffer: {
+              from: Buffer.from
+            },
             console: {
                 log: function (msg) {
                     t.ok(Buffer.isBuffer(msg));
@@ -31,7 +35,7 @@ test('bare', function (t) {
             }
         });
     }));
-    ps.stdin.end('console.log(Buffer("ABC"))');
+    ps.stdin.end('console.log(Buffer.from("ABC"))');
 
     ps.on('exit', function (code) {
         t.equal(code, 0);

test/bare.js

@@ -14,13 +14,17 @@ test('bare shebang', function (t) {
     ps.stderr.pipe(process.stderr);
     ps.stdout.pipe(concat(function (body) {
         vm.runInNewContext(body, {
-            Buffer: function (s) { return s.toLowerCase() },
+            Buffer: {
+              from: function (s) { return s.toLowerCase() }
+            },
             console: {
                 log: function (msg) { t.equal(msg, 'woo') }
             }
         });
         vm.runInNewContext(body, {
-            Buffer: Buffer,
+            Buffer: {
+              from: Buffer.from
+            },
             console: {
                 log: function (msg) {
                     t.ok(Buffer.isBuffer(msg));
@@ -29,7 +33,7 @@ test('bare shebang', function (t) {
             }
         });
     }));
-    ps.stdin.end('#!/usr/bin/env node\nconsole.log(Buffer("WOO"))');
+    ps.stdin.end('#!/usr/bin/env node\nconsole.log(Buffer.from("WOO"))');
 
     ps.on('exit', function (code) {
         t.equal(code, 0);