Verify response body contents with a system check

spec/controllers/admin/dashboard_controller_spec.rb

@@ -6,20 +6,34 @@ describe Admin::DashboardController do
   render_views
 
   describe 'GET #index' do
+    let(:user) { Fabricate(:user, role: UserRole.find_by(name: 'Admin')) }
+
     before do
-      allow(Admin::SystemCheck).to receive(:perform).and_return(system_check_messages_for_test_env)
-      sign_in Fabricate(:user, role: UserRole.find_by(name: 'Admin'))
+      stub_system_check_with_safe_results
+      sign_in(user)
     end
 
-    it 'returns 200' do
+    it 'returns http success' do
       get :index
 
-      expect(response).to have_http_status(200)
+      expect(response)
+        .to have_http_status(200)
+
+      expect(response.body)
+        .to include(
+          I18n.t('admin.system_checks.database_schema_check.message_html')
+        )
     end
 
     private
 
-    def system_check_messages_for_test_env
+    def stub_system_check_with_safe_results
+      allow(Admin::SystemCheck)
+        .to receive(:perform)
+        .and_return(safe_system_check_messages)
+    end
+
+    def safe_system_check_messages
       [
         Admin::SystemCheck::Message.new(:database_schema_check),
         Admin::SystemCheck::Message.new(:rules_check, nil, admin_rules_path),