1 files changed, 59 insertions, 0 deletions
diff --git a/spec/services/system_notes/incident_service_spec.rb b/spec/services/system_notes/incident_service_spec.rb
new file mode 100644
index 00000000000..ab9b9eb2bd4
--- /dev/null
+++ b/spec/services/system_notes/incident_service_spec.rb
@@ -0,0 +1,59 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe ::SystemNotes::IncidentService do
+  let_it_be(:author) { create(:user) }
+  let_it_be(:project) { create(:project) }
+  let_it_be(:noteable) { create(:incident, project: project) }
+  let_it_be(:issuable_severity) { create(:issuable_severity, issue: noteable, severity: :medium) }
+
+  describe '#change_incident_severity' do
+    subject(:change_severity) { described_class.new(noteable: noteable, project: project, author: author).change_incident_severity }
+
+    before do
+      allow(Gitlab::AppLogger).to receive(:error).and_call_original
+    end
+
+    it_behaves_like 'a system note' do
+      let(:action) { 'severity' }
+    end
+
+    IssuableSeverity.severities.keys.each do |severity|
+      context "with #{severity} severity" do
+        before do
+          issuable_severity.update!(severity: severity)
+        end
+
+        it 'has the appropriate message' do
+          severity_label = IssuableSeverity::SEVERITY_LABELS.fetch(severity.to_sym)
+
+          expect(change_severity.note).to eq("changed the severity to **#{severity_label}**")
+        end
+      end
+    end
+
+    context 'when severity is invalid' do
+      let(:invalid_severity) { 'invalid-severity' }
+
+      before do
+        allow(noteable).to receive(:severity).and_return(invalid_severity)
+      end
+
+      it 'does not create system note' do
+        expect { change_severity }.not_to change { noteable.notes.count }
+      end
+
+      it 'writes error to logs' do
+        change_severity
+
+        expect(Gitlab::AppLogger).to have_received(:error).with(
+          message: 'Cannot create a system note for severity change',
+          noteable_class: noteable.class.to_s,
+          noteable_id: noteable.id,
+          severity: invalid_severity
+        )
+      end
+    end
+  end
+end