Avoid require('vm') if testing AMD.

test/test.js

@@ -35,12 +35,11 @@
     var last = result[result.length - 1];
     result = (result.length > min && !/test(?:\.js)?$/.test(last)) ? last : '../lodash.js';
 
-    try {
     if (!amd) {
+      try {
         return require('fs').realpathSync(result);
-      }
       } catch(e) { }
-
+    }
     return result;
   }());
 
@@ -185,6 +184,7 @@
 
   // add values from other realms
   (function() {
+    if (!amd) {
       try {
         _.extend(_, require('vm').runInNewContext([
           '({',
@@ -203,7 +203,7 @@
           '})'
         ].join('\n')));
       } catch(e) { }
-
+    }
     if (!_._object && document) {
       var iframe = document.createElement('iframe');
       iframe.frameBorder = iframe.height = iframe.width = 0;