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我目前正在尝试遵循Ruby on Rails 文档中给出的性能测试教程。但我在第一步就陷入了困境！

当我尝试运行下面给出的命令时，出现错误，

命令：

$ rails generate performance_test homepage

我得到的错误：

Could not find generator 'performance_test'. Maybe you meant 'integration_test', 'resource_route' or 'coffee:assets'

我跑去"rails generator --help"查看可以生成的可能文件，下面是我得到的输出，

Running via Spring preloader in process 9465
Expected string default value for '--jbuilder'; got true (boolean)
Usage: rails generate GENERATOR [args] [options]

General options:
  -h, [--help]     # Print generator's options and usage
  -p, [--pretend]  # Run but do not make any changes
  -f, [--force]    # Overwrite files that already …