I'm using a call to wget to download a large datafile (multiple
megabytes) having assumed this will be quicker than using open-uri.

How can I spec the behaviour? Ideally I'd also like to not be hitting
the internet every time I test!

in my_object_spec.rb

  describe ".get_data" do
    before(:each) do
      @my_obj = MyObject.create(@valid_attributes)
    end
    it "should download the file" do
      # behaviour goes here
    end
  end


in my_object.rb:

  def get_data
      `wget --output-document=#{self.filename} #{self.file_uri}`
  end

I'll be massively grateful for any help anyone can give me.
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