Feature test for gfm embedding metrics

spec/features/markdown/metrics_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Metrics rendering', :js, :use_clean_rails_memory_store_caching do
+  include PrometheusHelpers
+
+  let(:user) { create(:user) }
+  let(:project) { create(:prometheus_project) }
+  let(:environment) { create(:environment, project: project) }
+  let(:issue) { create(:issue, project: project, description: description) }
+  let(:description) { "See [metrics dashboard](#{metrics_url}) for info." }
+  let(:metrics_url) { metrics_project_environment_url(project, environment) }
+
+  before do
+    configure_host
+    import_common_metrics
+    stub_any_prometheus_request_with_response
+
+    project.add_developer(user)
+
+    sign_in(user)
+  end
+
+  after do
+    restore_host
+  end
+
+  context 'with deployments and related deployable present' do
+    it 'shows embedded metrics' do
+      visit project_issue_path(project, issue)
+
+      expect(page).to have_css('div.prometheus-graph')
+      expect(page).to have_text('Memory Usage (Total)')
+      expect(page).to have_text('Core Usage (Total)')
+    end
+  end
+
+  def import_common_metrics
+    ::Gitlab::DatabaseImporters::CommonMetrics::Importer.new.execute
+  end
+
+  def configure_host
+    @original_default_host = default_url_options[:host]
+    @original_gitlab_url = Gitlab.config.gitlab[:url]
+
+    # Ensure we create a metrics url with the right host.
+    # Configure host for route helpers in specs (also updates root_url):
+    default_url_options[:host] = Capybara.server_host
+
+    # Ensure we identify urls with the appropriate host.
+    # Configure host to include port in app:
+    Gitlab.config.gitlab[:url] = root_url.chomp('/')
+  end
+
+  def restore_host
+    default_url_options[:host] = @original_default_host
+    Gitlab.config.gitlab[:url] = @original_gitlab_url
+  end
+end

spec/support/helpers/prometheus_helpers.rb

@@ -76,6 +76,14 @@ module PrometheusHelpers
     WebMock.stub_request(:any, /prometheus.example.com/)
   end
 
+  def stub_any_prometheus_request_with_response(status: 200, headers: {}, body: nil)
+    stub_any_prometheus_request.to_return({
+      status: status,
+      headers: { 'Content-Type' => 'application/json' }.merge(headers),
+      body: body || prometheus_values_body.to_json
+    })
+  end
+
   def stub_all_prometheus_requests(environment_slug, body: nil, status: 200)
     stub_prometheus_request(
       prometheus_query_with_time_url(prometheus_memory_query(environment_slug), Time.now.utc),