EE specific spec for job_artifact_uploader and jobs_controller

app/uploaders/job_artifact_uploader.rb

 class JobArtifactUploader < GitlabUploader
+  prepend EE::JobArtifactUploader
   extend Workhorse::UploadPath
   include ObjectStorage::Concern
 
@@ -15,11 +16,9 @@ class JobArtifactUploader < GitlabUploader
   end
 
   def open
-    if file_storage?
+    raise 'Only File System is supported' unless file_storage?
+
     File.open(path, "rb") if path
-    else
-      Gitlab::Ci::Trace::HttpIO.new(url, size)
-    end
   end
 
   def filename

ee/app/uploaders/ee/job_artifact_uploader.rb

+module EE
+  module JobArtifactUploader
+    extend ActiveSupport::Concern
+
+    def open
+      if file_storage?
+        super
+      else
+        ::Gitlab::Ci::Trace::HttpIO.new(url, size) if url
+      end
+    end
+  end
+end

spec/ee/spec/controllers/ee/projects/jobs_controller_spec.rb

+require 'spec_helper'
+
+describe Projects::JobsController do
+  include ApiHelpers
+
+  let(:project) { create(:project, :public) }
+  let(:pipeline) { create(:ci_pipeline, project: project) }
+
+  describe 'GET raw' do
+    subject do
+      post :raw, namespace_id: project.namespace,
+                 project_id: project,
+                 id: job.id
+    end
+
+    context 'when the trace artifact is in ObjectStorage' do
+      let!(:job) { create(:ci_build, :trace_artifact, pipeline: pipeline) }
+
+      before do
+        allow_any_instance_of(JobArtifactUploader).to receive(:file_storage?) { false }
+      end
+
+      it 'redirect to the trace file url' do
+        expect(subject).to redirect_to(job.job_artifacts_trace.file.url)
+      end
+    end
+  end
+end

spec/ee/spec/uploaders/ee/job_artifact_uploader_spec.rb

+require 'spec_helper'
+
+describe JobArtifactUploader do
+  let(:store) { described_class::LOCAL_STORE }
+  let(:job_artifact) { create(:ci_job_artifact, file_store: store) }
+  let(:uploader) { described_class.new(job_artifact, :file) }
+
+  describe '#open' do
+    subject { uploader.open }
+
+    context 'when trace is stored in Object storage' do
+      before do
+        allow(uploader).to receive(:file_storage?) { false }
+        allow(uploader).to receive(:url) { 'http://object_storage.com/trace' }
+      end
+
+      it 'returns http io stream' do
+        is_expected.to be_a(Gitlab::Ci::Trace::HttpIO)
+      end
+    end
+  end
+end