Add latest changes from gitlab-org/gitlab@master

1 files changed, 113 insertions, 0 deletions

diff --git a/spec/services/clusters/applications/prometheus_health_check_service_spec.rb b/spec/services/clusters/applications/prometheus_health_check_service_spec.rb
new file mode 100644
index 00000000000..5c4127e4938
--- /dev/null
+++ b/spec/services/clusters/applications/prometheus_health_check_service_spec.rb
@@ -0,0 +1,113 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Clusters::Applications::PrometheusHealthCheckService, '#execute' do
+  let(:service) { described_class.new(cluster) }
+
+  subject { service.execute }
+
+  RSpec.shared_examples 'no alert' do
+    it 'does not send alert' do
+      expect(Projects::Alerting::NotifyService).not_to receive(:new)
+
+      subject
+    end
+  end
+
+  RSpec.shared_examples 'sends alert' do
+    it 'sends an alert' do
+      expect_next_instance_of(Projects::Alerting::NotifyService) do |notify_service|
+        expect(notify_service).to receive(:execute).with(alerts_service.token)
+      end
+
+      subject
+    end
+  end
+
+  RSpec.shared_examples 'correct health stored' do
+    it 'stores the correct health of prometheus app' do
+      subject
+
+      expect(prometheus.healthy).to eq(client_healthy)
+    end
+  end
+
+  context 'when cluster is not project_type' do
+    let(:cluster) { create(:cluster, :instance) }
+
+    it { expect { subject }.to raise_error(RuntimeError, 'Invalid cluster type. Only project types are allowed.') }
+  end
+
+  context 'when cluster is project_type' do
+    let_it_be(:alerts_service) { create(:alerts_service) }
+    let_it_be(:project) { create(:project, alerts_service: alerts_service) }
+    let(:applications_prometheus_healthy) { true }
+    let(:prometheus) { create(:clusters_applications_prometheus, status: prometheus_status_value, healthy: applications_prometheus_healthy) }
+    let(:cluster) { create(:cluster, :project, application_prometheus: prometheus, projects: [project]) }
+
+    context 'when prometheus not installed' do
+      let(:prometheus_status_value) { Clusters::Applications::Prometheus.state_machine.states[:installing].value }
+
+      it { expect(subject).to eq(nil) }
+      include_examples 'no alert'
+    end
+
+    context 'when prometheus installed' do
+      let(:prometheus_status_value) { Clusters::Applications::Prometheus.state_machine.states[:installed].value }
+
+      before do
+        client = instance_double('PrometheusClient', healthy?: client_healthy)
+        expect(prometheus).to receive(:prometheus_client).and_return(client)
+      end
+
+      context 'when newly unhealthy' do
+        let(:applications_prometheus_healthy) { true }
+        let(:client_healthy) { false }
+
+        include_examples 'sends alert'
+        include_examples 'correct health stored'
+      end
+
+      context 'when newly healthy' do
+        let(:applications_prometheus_healthy) { false }
+        let(:client_healthy) { true }
+
+        include_examples 'no alert'
+        include_examples 'correct health stored'
+      end
+
+      context 'when continuously unhealthy' do
+        let(:applications_prometheus_healthy) { false }
+        let(:client_healthy) { false }
+
+        include_examples 'no alert'
+        include_examples 'correct health stored'
+      end
+
+      context 'when continuously healthy' do
+        let(:applications_prometheus_healthy) { true }
+        let(:client_healthy) { true }
+
+        include_examples 'no alert'
+        include_examples 'correct health stored'
+      end
+
+      context 'when first health check and healthy' do
+        let(:applications_prometheus_healthy) { nil }
+        let(:client_healthy) { true }
+
+        include_examples 'no alert'
+        include_examples 'correct health stored'
+      end
+
+      context 'when first health check and not healthy' do
+        let(:applications_prometheus_healthy) { nil }
+        let(:client_healthy) { false }
+
+        include_examples 'sends alert'
+        include_examples 'correct health stored'
+      end
+    end
+  end
+end