Add tests for remote downloader

spec/uploaders/remote_downloader_spec.rb

@@ -0,0 +1,12 @@
+require 'spec_helper'
+
+describe RemoteDownloader do
+
+  let(:filename) { 'file_name.pdf' }
+
+  subject { described_class.new filename }
+
+  describe '#url' do
+    it { expect(subject.url).to eq 'https://storage.apientreprise.fr/tps_dev/file_name.pdf' }
+  end
+end