enable QUnit.config.noglobals in tests

karma.conf-sauce.js

@@ -64,6 +64,7 @@ module.exports = function(config) {
     // list of files / patterns to load in the browser
     files: [
       'test/vendor/qunit-extras.js',
+      'test/qunit-setup.js',
       'underscore.js',
       'test/*.js'
     ],

karma.conf.js

@@ -15,6 +15,7 @@ module.exports = function(config) {
     // list of files / patterns to load in the browser
     files: [
       'test/vendor/qunit-extras.js',
+      'test/qunit-setup.js',
       'underscore.js',
       'test/*.js'
     ],

test/index.html

@@ -11,7 +11,7 @@
   <script src="vendor/qunit.js"></script>
   <script src="vendor/qunit-extras.js"></script>
   <script src="../underscore.js"></script>
-
+  <script src="qunit-setup.js"></script>
   <script src="collections.js"></script>
   <script src="arrays.js"></script>
   <script src="functions.js"></script>

test/qunit-setup.js

@@ -0,0 +1,3 @@
+(function() {
+  QUnit.config.noglobals = true;
+}());

test/utility.js

@@ -21,6 +21,8 @@
       if (typeof require != 'function') {
         assert.equal(this._, void 0, 'global underscore is removed');
         this._ = underscore;
+      } else if (typeof global !== 'undefined') {
+        delete global._;
       }
     });
   }