FEATURE: report on admin dashboard when favicon is failing to load

spec/models/admin_dashboard_data_spec.rb

@@ -278,4 +278,26 @@ describe AdminDashboardData do
     include_examples 'stats cachable'
   end
 
+  describe '#problem_message_check' do
+    let(:key) { AdminDashboardData.problem_messages.first }
+
+    before do
+      described_class.clear_problem_message(key)
+    end
+
+    it 'returns nil if message has not been added' do
+      expect(described_class.problem_message_check(key)).to be_nil
+    end
+
+    it 'returns a message if it was added' do
+      described_class.add_problem_message(key)
+      expect(described_class.problem_message_check(key)).to eq(I18n.t(key))
+    end
+
+    it 'returns a message if it was added with an expiry' do
+      described_class.add_problem_message(key, 300)
+      expect(described_class.problem_message_check(key)).to eq(I18n.t(key))
+    end
+  end
+
 end