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diff --git a/node_modules/mocha/lib/interfaces/bdd.js b/node_modules/mocha/lib/interfaces/bdd.js
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+++ b/node_modules/mocha/lib/interfaces/bdd.js
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+
+/**
+ * Module dependencies.
+ */
+
+var Suite = require('../suite')
+  , Test = require('../test');
+
+/**
+ * BDD-style interface:
+ * 
+ *      describe('Array', function(){
+ *        describe('#indexOf()', function(){
+ *          it('should return -1 when not present', function(){
+ *
+ *          });
+ *
+ *          it('should return the index when present', function(){
+ *
+ *          });
+ *        });
+ *      });
+ * 
+ */
+
+module.exports = function(suite){
+  var suites = [suite];
+
+  suite.on('pre-require', function(context){
+
+    // noop variants
+
+    context.xdescribe = function(){};
+    context.xit = function(){};
+
+    /**
+     * Execute before running tests.
+     */
+
+    context.before = function(fn){
+      suites[0].beforeAll(fn);
+    };
+
+    /**
+     * Execute after running tests.
+     */
+
+    context.after = function(fn){
+      suites[0].afterAll(fn);
+    };
+
+    /**
+     * Execute before each test case.
+     */
+
+    context.beforeEach = function(fn){
+      suites[0].beforeEach(fn);
+    };
+
+    /**
+     * Execute after each test case.
+     */
+
+    context.afterEach = function(fn){
+      suites[0].afterEach(fn);
+    };
+
+    /**
+     * Describe a "suite" with the given `title`
+     * and callback `fn` containing nested suites
+     * and/or tests.
+     */
+  
+    context.describe = function(title, fn){
+      var suite = Suite.create(suites[0], title);
+      suites.unshift(suite);
+      fn();
+      suites.shift();
+    };
+
+    /**
+     * Describe a specification or test-case
+     * with the given `title` and callback `fn`
+     * acting as a thunk.
+     */
+
+    context.it = function(title, fn){
+      suites[0].addTest(new Test(title, fn));
+    };
+  });
+};