code: def createJsbConfig(self):
          
          tempdir = mkdtemp()
          tempfile = join(tempdir, 'app.jsb3')
          cmd = ['sencha', 'create', 'jsb', '-a', self.url, '-p', tempfile]
          log.debug('Running: %s', ' '.join(cmd))
          call(cmd)
          jsb3 = open(tempfile).read()
          rmtree(tempdir)
          return jsb3
docs: Create JSB config file using ``sencha create jsb``.
  
          :return: The created jsb3 config as a string.