As far as I know, you cannot scroll the output coming from an external source.
Messages have a simple scroll, but only for messages for which Vim has full control. See :h messages .
If you look at your screenshot, I can tell you that you are doing it wrong. Running RSpec through :!rspec inefficient. Vim has an RSpec compiler at runtime.
:compiler rspec :make
RSpec output is now parsed and populated into a quick list for easy navigation.
For even greater RSpec power, such as asynchronous test runs, check dispatch.vim .
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