How to mock open when is used in another method?

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I have a method that looks like this:

def set_container_bg
  open(self.page.permanent_screenshot) do |file|
    # some logic with file
  end
end

And I am trying to create a rspec test, but I want to mock the open method inside set_container_bg, so that it returns something that I expect?

How can I do so?

asked 55 secs ago

Hommer Smith

2,754