Check if prometheus_adapter is properly called

app/controllers/projects/prometheus/metrics_controller.rb

@@ -21,9 +21,10 @@ module Projects
       private
 
       def prometheus_adapter
-        @prometheus_adapter ||= Prometheus::AdapterService.new(project).prometheus_adapter
+        @prometheus_adapter ||= ::Prometheus::AdapterService.new(project).prometheus_adapter
       end
 
+
       def require_prometheus_metrics!
         render_404 unless prometheus_adapter.can_query?
       end

spec/controllers/projects/prometheus/metrics_controller_spec.rb

@@ -7,13 +7,15 @@ describe Projects::Prometheus::MetricsController do
   let(:prometheus_adapter) { double('prometheus_adapter', can_query?: true) }
 
   before do
-    allow(controller).to receive(:prometheus_adapter).and_return(prometheus_adapter)
-
     project.add_master(user)
     sign_in(user)
   end
 
   describe 'GET #active_common' do
+    before do
+      allow(controller).to receive(:prometheus_adapter).and_return(prometheus_adapter)
+    end
+
     context 'when prometheus metrics are enabled' do
       context 'when data is not present' do
         before do
@@ -52,6 +54,18 @@ describe Projects::Prometheus::MetricsController do
     end
   end
 
+  describe '#prometheus_adapter' do
+    before do
+      allow(controller).to receive(:project).and_return(project)
+    end
+
+    it 'calls prometheus adapter service' do
+      expect_any_instance_of(::Prometheus::AdapterService).to receive(:prometheus_adapter)
+
+      subject.__send__(:prometheus_adapter)
+    end
+  end
+
   def project_params(opts = {})
     opts.reverse_merge(namespace_id: project.namespace, project_id: project)
   end

spec/models/environment_spec.rb

@@ -623,36 +623,10 @@ describe Environment do
   end
 
   describe '#prometheus_adapter' do
-    let(:cluster) { create(:cluster, :provided_by_user, environment_scope: '*', projects: [project]) }
+    it 'calls prometheus adapter service' do
+      expect_any_instance_of(Prometheus::AdapterService).to receive(:prometheus_adapter)
 
-    context 'prometheus service can execute queries' do
-      let(:prometheus_service) { double(:prometheus_service, can_query?: true) }
-
-      before do
-        allow(environment.project).to receive(:find_or_initialize_service).with('prometheus').and_return prometheus_service
-      end
-
-      it 'return prometheus service as prometheus adapter' do
-        expect(environment.prometheus_adapter).to eq(prometheus_service)
-      end
-    end
-
-    context "prometheus service can't execute queries" do
-      let(:prometheus_service) { double(:prometheus_service, can_query?: false) }
-
-      context 'with cluster with prometheus installed' do
-        let!(:prometheus) { create(:clusters_applications_prometheus, :installed, cluster: cluster) }
-
-        it 'returns application handling all environments' do
-          expect(environment.prometheus_adapter).to eq(prometheus)
-        end
-      end
-
-      context 'with cluster without prometheus installed' do
-        it 'returns nil' do
-          expect(environment.prometheus_adapter).to be_nil
-        end
-      end
+      subject.prometheus_adapter
     end
   end
 end