Media controller specs (#2022)

* Add spec for media controller

* Add MediaAttachment.attached scope

* Simplify methods in media controller

spec/controllers/media_controller_spec.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe MediaController do
+  describe '#show' do
+    it 'redirects to the file url when attached to a status' do
+      status = Fabricate(:status)
+      media_attachment = Fabricate(:media_attachment, status: status)
+      get :show, params: { id: media_attachment.to_param }
+
+      expect(response).to redirect_to(media_attachment.file.url(:original))
+    end
+
+    it 'responds with missing when there is not an attached status' do
+      media_attachment = Fabricate(:media_attachment, status: nil)
+      get :show, params: { id: media_attachment.to_param }
+
+      expect(response).to have_http_status(:missing)
+    end
+
+    it 'raises when shortcode cant be found' do
+      get :show, params: { id: 'missing' }
+
+      expect(response).to have_http_status(:missing)
+    end
+
+    it 'raises when not permitted to view' do
+      status = Fabricate(:status)
+      media_attachment = Fabricate(:media_attachment, status: status)
+      allow_any_instance_of(Status).to receive(:permitted?).and_return(false)
+      get :show, params: { id: media_attachment.to_param }
+
+      expect(response).to have_http_status(:missing)
+    end
+  end
+end