1 files changed, 169 insertions, 0 deletions
diff --git a/spec/finders/projects/prometheus/alerts_finder_spec.rb b/spec/finders/projects/prometheus/alerts_finder_spec.rb
new file mode 100644
index 00000000000..bb59e77cca8
--- /dev/null
+++ b/spec/finders/projects/prometheus/alerts_finder_spec.rb
@@ -0,0 +1,169 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Projects::Prometheus::AlertsFinder do
+  let(:finder) { described_class.new(params) }
+  let(:params) { {} }
+
+  describe 'with params' do
+    let_it_be(:project) { create(:project) }
+    let_it_be(:other_project) { create(:project) }
+    let_it_be(:other_env) { create(:environment, project: other_project) }
+    let_it_be(:production) { create(:environment, project: project) }
+    let_it_be(:staging) { create(:environment, project: project) }
+    let_it_be(:alert) { create_alert(project, production) }
+    let_it_be(:alert2) { create_alert(project, production) }
+    let_it_be(:stg_alert) { create_alert(project, staging) }
+    let_it_be(:other_alert) { create_alert(other_project, other_env) }
+
+    describe '#execute' do
+      subject { finder.execute }
+
+      context 'with project' do
+        before do
+          params[:project] = project
+        end
+
+        it { is_expected.to eq([alert, alert2, stg_alert]) }
+
+        context 'with matching metric' do
+          before do
+            params[:metric] = alert.prometheus_metric
+          end
+
+          it { is_expected.to eq([alert]) }
+        end
+
+        context 'with matching metric id' do
+          before do
+            params[:metric] = alert.prometheus_metric_id
+          end
+
+          it { is_expected.to eq([alert]) }
+        end
+
+        context 'with project non-specific metric' do
+          before do
+            params[:metric] = other_alert.prometheus_metric
+          end
+
+          it { is_expected.to be_empty }
+        end
+      end
+
+      context 'with environment' do
+        before do
+          params[:environment] = production
+        end
+
+        it { is_expected.to eq([alert, alert2]) }
+
+        context 'with matching metric' do
+          before do
+            params[:metric] = alert.prometheus_metric
+          end
+
+          it { is_expected.to eq([alert]) }
+        end
+
+        context 'with environment non-specific metric' do
+          before do
+            params[:metric] = stg_alert.prometheus_metric
+          end
+
+          it { is_expected.to be_empty }
+        end
+      end
+
+      context 'with matching project and environment' do
+        before do
+          params[:project] = project
+          params[:environment] = production
+        end
+
+        it { is_expected.to eq([alert, alert2]) }
+
+        context 'with matching metric' do
+          before do
+            params[:metric] = alert.prometheus_metric
+          end
+
+          it { is_expected.to eq([alert]) }
+        end
+
+        context 'with environment non-specific metric' do
+          before do
+            params[:metric] = stg_alert.prometheus_metric
+          end
+
+          it { is_expected.to be_empty }
+        end
+
+        context 'with matching id' do
+          before do
+            params[:id] = alert.id
+          end
+
+          it { is_expected.to eq([alert]) }
+        end
+
+        context 'with a nil id' do
+          before do
+            params[:id] = nil
+          end
+
+          it { is_expected.to eq([alert, alert2]) }
+        end
+      end
+
+      context 'with non-matching project-environment pair' do
+        before do
+          params[:project] = project
+          params[:environment] = other_env
+        end
+
+        it { is_expected.to be_empty }
+      end
+
+      context 'with id' do
+        before do
+          params[:id] = alert.id
+        end
+
+        it { is_expected.to eq([alert]) }
+      end
+
+      context 'with multiple ids' do
+        before do
+          params[:id] = [alert.id, other_alert.id]
+        end
+
+        it { is_expected.to eq([alert, other_alert]) }
+      end
+
+      context 'with non-matching id' do
+        before do
+          params[:id] = -5
+        end
+
+        it { is_expected.to be_empty }
+      end
+    end
+
+    private
+
+    def create_alert(project, environment)
+      create(:prometheus_alert, project: project, environment: environment)
+    end
+  end
+
+  describe 'without params' do
+    subject { finder }
+
+    it 'raises an error' do
+      expect { subject }
+        .to raise_error(ArgumentError, 'Please provide one or more of the following params: :project, :environment, :id')
+    end
+  end
+end