old_contents: describe('top describe', function () {
      it('first it', function () {
          console.log('WWWW');
      });
  
      it('second it', function () {
          console.log('WWWW');
      });
  
      describe('inner describe', function () {
          it('inner it 1', function () {
              var a;
          });
  
          it('inner it 2', function () {
              <caret>
              var a;
          });
  
          iit('inner it 3', function () {
              var a;
          });
      });
  });
  
new_contents: describe('top describe', function () {
      it('first it', function () {
          console.log('WWWW');
      });
  
      it('second it', function () {
          console.log('WWWW');
      });
  
      ddescribe('inner describe', function () {
          it('inner it 1', function () {
              var a;
          });
  
          it('inner it 2', function () {
              <caret>
              var a;
          });
  
          iit('inner it 3', function () {
              var a;
          });
      });
  });
  
subject: add a dd