FIX: Add missing test

spec/components/file_helper_spec.rb

@@ -0,0 +1,25 @@
+require 'rails_helper'
+require 'file_helper'
+
+describe FileHelper do
+
+  let(:url) { "https://eviltrout.com/trout.png" }
+  let(:png) { Base64.decode64("R0lGODlhAQABALMAAAAAAIAAAACAAICAAAAAgIAAgACAgMDAwICAgP8AAAD/AP//AAAA//8A/wD//wBiZCH5BAEAAA8ALAAAAAABAAEAAAQC8EUAOw==") }
+
+  before do
+    stub_request(:get, url).to_return(body: png)
+  end
+
+  describe "download" do
+    it "returns a file with the image" do
+      tmpfile = FileHelper.download(url, 10000, 'trouttmp')
+      expect(tmpfile.read[0..5]).to eq("GIF89a")
+    end
+
+    it "works with a protocol relative url" do
+      tmpfile = FileHelper.download("//eviltrout.com/trout.png", 10000, 'trouttmp')
+      expect(tmpfile.read[0..5]).to eq("GIF89a")
+    end
+  end
+
+end