text: /**
   * Module dependencies.
   */
  
  var Suite = require('../suite');
  var Test = require('../test');
  var escapeRe = require('escape-string-regexp');
  
  /**
   * 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() {
   *            // ...
   *          });
   *        });
   *      });
   *
   * @param {Suite} suite Root suite.
   */
  module.exports = function(suite) {
    var suites = [suite];
  
    suite.on('pre-require', function(context, file, mocha) {
      var common = require('./common')(suites, context);
  
      context.before = common.before;
      context.after = common.after;
      context.beforeEach = common.beforeEach;
      context.afterEach = common.afterEach;
      context.run = mocha.options.delay && common.runWithSuite(suite);
      /**
       * Describe a "suite" with the given `title`
       * and callback `fn` containing nested suites
       * and/or tests.
       */
  
      context.describe = context.context = function(title, fn) {
        var suite = Suite.create(suites[0], title);
        suite.file = file;
        suites.unshift(suite);
        fn.call(suite);
        suites.shift();
        return suite;
      };
  
      /**
       * Pending describe.
       */
  
      context.xdescribe = context.xcontext = context.describe.skip = function(title, fn) {
        var suite = Suite.create(suites[0], title);
        suite.pending = true;
        suites.unshift(suite);
        fn.call(suite);
        suites.shift();
      };
  
      /**
       * Exclusive suite.
       */
  
      context.describe.only = function(title, fn) {
        var suite = context.describe(title, fn);
        mocha.grep(suite.fullTitle());
        return suite;
      };
  
      /**
       * Describe a specification or test-case
       * with the given `title` and callback `fn`
       * acting as a thunk.
       */
  
      var it = context.it = context.specify = function(title, fn) {
        var suite = suites[0];
        if (suite.pending) {
          fn = null;
        }
        var test = new Test(title, fn);
        test.file = file;
        suite.addTest(test);
        return test;
      };
  
      /**
       * Exclusive test-case.
       */
  
      context.it.only = function(title, fn) {
        var test = it(title, fn);
        var reString = '^' + escapeRe(test.fullTitle()) + '$';
        mocha.grep(new RegExp(reString));
        return test;
      };
  
      /**
       * Pending test case.
       */
  
      context.xit = context.xspecify = context.it.skip = function(title) {
        context.it(title);
      };
  
      /**
       * Number of attempts to retry.
       */
      context.it.retries = function(n) {
        context.retries(n);
      };
    });
  };
  