old_contents: 
  
  describe('Helper', function() {
    "use strict";
  
    var helper = require('../lib/helper.js');
    it('check integrality', function() {
      helper.should.have.a.type('object');
      helper.should.have.properties([
          'extend',
          'isArray',
          'isDate',
          'isRegExp',
          'isNum'
        ]);
    });
  
  
  });
  
new_contents: 
  
  describe('Helper', function() {
    "use strict";
  
    var helper = require('../lib/helper.js');
    it('check integrality', function() {
      helper.should.have.a.type('object');
      helper.should.have.properties([
          'extend', 'isArray', 'isDate', 'isRegExp', 'isNum'
        ]);
    });
  
  
  });
  
subject: join line