1 files changed, 88 insertions, 0 deletions
diff --git a/spec/services/incident_management/link_alerts/destroy_service_spec.rb b/spec/services/incident_management/link_alerts/destroy_service_spec.rb
new file mode 100644
index 00000000000..13885ab7d5d
--- /dev/null
+++ b/spec/services/incident_management/link_alerts/destroy_service_spec.rb
@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe IncidentManagement::LinkAlerts::DestroyService, feature_category: :incident_management do
+  let_it_be(:project) { create(:project) }
+  let_it_be(:another_project) { create(:project) }
+  let_it_be(:developer) { create(:user) }
+  let_it_be(:guest) { create(:user) }
+  let_it_be(:incident) { create(:incident, project: project) }
+  let_it_be(:another_incident) { create(:incident, project: project) }
+  let_it_be(:internal_alert) { create(:alert_management_alert, project: project, issue: incident) }
+  let_it_be(:external_alert) { create(:alert_management_alert, project: another_project, issue: incident) }
+  let_it_be(:unrelated_alert) { create(:alert_management_alert, project: project, issue: another_incident) }
+
+  before_all do
+    project.add_guest(guest)
+    project.add_developer(developer)
+  end
+
+  describe '#execute' do
+    subject(:execute) { described_class.new(incident, current_user, alert).execute }
+
+    let(:alert) { internal_alert }
+
+    context 'when current user is a guest' do
+      let(:current_user) { guest }
+
+      it 'responds with error', :aggregate_failures do
+        response = execute
+
+        expect(response).to be_error
+        expect(response.message).to eq('You have insufficient permissions to manage alerts for this project')
+      end
+
+      it 'does not unlink alert from the incident' do
+        expect { execute }.not_to change { incident.reload.alert_management_alerts.to_a }
+      end
+    end
+
+    context 'when current user is a developer' do
+      let(:current_user) { developer }
+
+      it 'responds with success', :aggregate_failures do
+        response = execute
+
+        expect(response).to be_success
+        expect(response.payload[:incident]).to eq(incident)
+      end
+
+      context 'when unlinking internal alert' do
+        let(:alert) { internal_alert }
+
+        it 'unlinks the alert' do
+          expect { execute }
+            .to change { incident.reload.alert_management_alerts.to_a }
+            .to match_array([external_alert])
+        end
+      end
+
+      context 'when unlinking external alert' do
+        let(:alert) { external_alert }
+
+        it 'unlinks the alert' do
+          expect { execute }
+            .to change { incident.reload.alert_management_alerts.to_a }
+            .to match_array([internal_alert])
+        end
+      end
+
+      context 'when unlinking an alert not related to the incident' do
+        let(:alert) { unrelated_alert }
+
+        it "does not change the incident's alerts" do
+          expect { execute }.not_to change { incident.reload.alert_management_alerts.to_a }
+        end
+
+        it "does not change another incident's alerts" do
+          expect { execute }.not_to change { another_incident.reload.alert_management_alerts.to_a }
+        end
+
+        it "does not change the alert's incident" do
+          expect { execute }.not_to change { unrelated_alert.reload.issue }
+        end
+      end
+    end
+  end
+end