[Rails] Minitest mock or stub methods

Hi

I'm building a small library to use in my Rails app which interacts with a 3rd party API. It fetches artists and tracks.

So I have:

lib/my_lib.rb

lib/my_lib/artist.rb

lib/my_lib/track.rb

To get an artist I do

artist = MyLib::Artist.find("Oasis")

Which returns an instance of Artist if it finds (via 3rd party API) it or nil otherwise.

Then I can call artist.tracks which fetches all available tracks at the 3rd party and returns them as an array.

In my artist class I have a separate method that makes the actual API calls and parses the XML response with Nokogiri

def self.find(name: nil)

  # Stuff...

  doc = get_data(some_url)

  # More stuff...

end

def get_data(req_url)

  Nokogiri::XML(open(req_url))

end

When writing my tests I don't want to hit the actual URL but instead load an XML file from disk.

I'm using Minitest which has a mocking library, but how do I actually mock (or is it more appropriate to stub?) the method?

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