Fix remote mirror last_update_at nil error in view

app/views/projects/mirrors/_push.html.haml

@@ -17,7 +17,11 @@
       - if @remote_mirror.last_error.present?
         .panel.panel-danger
           .panel-heading
+            - if @remote_mirror.last_update_at
               The remote repository failed to update #{time_ago_with_tooltip(@remote_mirror.last_update_at)}.
+            - else
+              The remote repository failed to update.
+
             - if @remote_mirror.last_successful_update_at
               Last successful update #{time_ago_with_tooltip(@remote_mirror.last_successful_update_at)}.
           .panel-body

spec/features/projects/remote_mirror_spec.rb

+require 'spec_helper'
+
+feature 'Project remote mirror', feature: true do
+  let(:project) { create(:project, :remote_mirror) }
+  let(:remote_mirror) { project.remote_mirrors.first }
+  let(:user) { create(:user) }
+
+  describe 'On a project', js: true do
+    before do
+      project.team << [user, :master]
+      sign_in user
+    end
+
+    context 'when last_error is present but last_update_at is not' do
+      it 'renders error message without timstamp' do
+        remote_mirror.update_attributes(last_error: 'Some new error', last_update_at: nil)
+
+        visit project_mirror_path(project)
+
+        expect(page).to have_content('The remote repository failed to update.')
+      end
+    end
+
+    context 'when last_error and last_update_at are present' do
+      it 'renders error message with timestamp' do
+        remote_mirror.update_attributes(last_error: 'Some new error', last_update_at: Time.now - 5.minutes)
+
+        visit project_mirror_path(project)
+
+        expect(page).to have_content('The remote repository failed to update 5 minutes ago.')
+      end
+    end
+  end
+end