[Tests] skip generator tests in nodes that don’t support generators

package.json

@@ -77,6 +77,7 @@
     "coffee-script": "~1.10.0",
     "coffeeify": "~1.1.0",
     "isstream": "^0.1.2",
+    "make-generator-function": "^1.1.0",
     "seq": "0.3.5",
     "tap": "^10.7.2",
     "temp": "^0.8.1",

test/yield.js

@@ -1,17 +1,18 @@
 var browserify = require('../');
 var test = require('tap').test;
 var vm = require('vm');
+var generatorFunction = require('make-generator-function');
 
-test('yield', function (t) {
+test('yield', { skip: !generatorFunction }, function (t) {
     t.plan(6);
     var b = browserify(__dirname + '/yield/main.js');
-    
+
     b.bundle(function (err, src) {
         t.error(err);
         var c = { console: { log: log } };
         var index = 0;
         vm.runInNewContext(src, c);
-        
+
         function log (msg) {
             t.equal(index++, msg);
         }