1 files changed, 52 insertions, 0 deletions
diff --git a/spec/services/projects/prometheus/alerts/create_service_spec.rb b/spec/services/projects/prometheus/alerts/create_service_spec.rb
new file mode 100644
index 00000000000..50c776df734
--- /dev/null
+++ b/spec/services/projects/prometheus/alerts/create_service_spec.rb
@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Projects::Prometheus::Alerts::CreateService do
+  let_it_be(:project) { create(:project) }
+  let_it_be(:user) { create(:user) }
+
+  let(:service) { described_class.new(project, user, params) }
+
+  subject { service.execute }
+
+  describe '#execute' do
+    context 'with params' do
+      let_it_be(:environment) { create(:environment, project: project) }
+
+      let_it_be(:metric) do
+        create(:prometheus_metric, project: project)
+      end
+
+      let(:params) do
+        {
+          environment_id: environment.id,
+          prometheus_metric_id: metric.id,
+          operator: '<',
+          threshold: 1.0
+        }
+      end
+
+      it 'creates an alert' do
+        expect(subject).to be_persisted
+
+        expect(subject).to have_attributes(
+          project: project,
+          environment: environment,
+          prometheus_metric: metric,
+          operator: 'lt',
+          threshold: 1.0
+        )
+      end
+    end
+
+    context 'without params' do
+      let(:params) { {} }
+
+      it 'fails to create' do
+        expect(subject).to be_new_record
+        expect(subject).to be_invalid
+      end
+    end
+  end
+end