1 files changed, 22 insertions, 1 deletions
diff --git a/spec/controllers/projects/environments/prometheus_api_controller_spec.rb b/spec/controllers/projects/environments/prometheus_api_controller_spec.rb
index 68d50cf19f0..6b0c164e432 100644
--- a/spec/controllers/projects/environments/prometheus_api_controller_spec.rb
+++ b/spec/controllers/projects/environments/prometheus_api_controller_spec.rb
@@ -4,7 +4,7 @@ require 'spec_helper'
 
 RSpec.describe Projects::Environments::PrometheusApiController do
   let_it_be(:user) { create(:user) }
-  let_it_be(:project) { create(:project) }
+  let_it_be_with_reload(:project) { create(:project) }
   let_it_be(:proxyable) { create(:environment, project: project) }
 
   before do
@@ -70,6 +70,27 @@ RSpec.describe Projects::Environments::PrometheusApiController do
           expect(response).to redirect_to(new_user_session_path)
         end
       end
+
+      context 'with a public project' do
+        before do
+          project.update!(visibility_level: Gitlab::VisibilityLevel::PUBLIC)
+          project.project_feature.update!(metrics_dashboard_access_level: ProjectFeature::ENABLED)
+        end
+
+        context 'with guest user' do
+          let(:prometheus_body) { nil }
+
+          before do
+            project.add_guest(user)
+          end
+
+          it 'returns 404' do
+            get :prometheus_proxy, params: prometheus_proxy_params
+
+            expect(response).to have_gitlab_http_status(:not_found)
+          end
+        end
+      end
     end
   end
 end