Make tests independent on mailer settings

So tests won't fail when institutions change these default settings.

spec/lib/tasks/dashboards_spec.rb

@@ -48,6 +48,11 @@ describe "Dashboards Rake" do
       let!(:action)   { create(:dashboard_action, :proposed_action, :active, day_offset: 0) }
       let!(:resource) { create(:dashboard_action, :resource, :active, day_offset: 0) }
 
+      before do
+        Setting["mailer_from_name"] = "CONSUL"
+        Setting["mailer_from_address"] = "noreply@consul.dev"
+      end
+
       it " when there are news actions actived for published proposals" do
         proposal = create(:proposal)
         action.update!(published_proposal: true)

spec/mailers/dashboard/mailer_spec.rb

@@ -11,6 +11,8 @@ describe Dashboard::Mailer do
 
   before do
     Setting["feature.dashboard.notification_emails"] = true
+    Setting["mailer_from_name"] = "CONSUL"
+    Setting["mailer_from_address"] = "noreply@consul.dev"
   end
 
   describe "#forward" do