1 files changed, 46 insertions, 0 deletions
diff --git a/spec/requests/projects/ci/promeheus_metrics/histograms_controller_spec.rb b/spec/requests/projects/ci/promeheus_metrics/histograms_controller_spec.rb
new file mode 100644
index 00000000000..5d2f3e98bb4
--- /dev/null
+++ b/spec/requests/projects/ci/promeheus_metrics/histograms_controller_spec.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'Projects::Ci::PrometheusMetrics::HistogramsController' do
+  let_it_be(:project) { create(:project, :public) }
+
+  describe 'POST /*namespace_id/:project_id/-/ci/prometheus_metrics/histograms' do
+    context 'with known histograms' do
+      it 'returns 201 Created' do
+        post histograms_route(histograms: [
+          { name: :pipeline_graph_link_calculation_duration_seconds, value: 1 },
+          { name: :pipeline_graph_links_total, value: 10 }
+        ])
+
+        expect(response).to have_gitlab_http_status(:created)
+      end
+    end
+
+    context 'with unknown histograms' do
+      it 'returns 404 Not Found' do
+        post histograms_route(histograms: [{ name: :chunky_bacon, value: 5 }])
+
+        expect(response).to have_gitlab_http_status(:not_found)
+      end
+    end
+
+    context 'with the feature flag disabled' do
+      before do
+        stub_feature_flags(ci_accept_frontend_prometheus_metrics: false)
+      end
+
+      it 'returns 202 Accepted' do
+        post histograms_route(histograms: [
+          { name: :pipeline_graph_link_calculation_duration_seconds, value: 1 }
+        ])
+
+        expect(response).to have_gitlab_http_status(:accepted)
+      end
+    end
+  end
+
+  def histograms_route(params = {})
+    namespace_project_ci_prometheus_metrics_histograms_path(namespace_id: project.namespace, project_id: project, **params)
+  end
+end