1 files changed, 27 insertions, 0 deletions
diff --git a/spec/serializers/ci/codequality_mr_diff_entity_spec.rb b/spec/serializers/ci/codequality_mr_diff_entity_spec.rb
new file mode 100644
index 00000000000..82708908d95
--- /dev/null
+++ b/spec/serializers/ci/codequality_mr_diff_entity_spec.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Ci::CodequalityMrDiffEntity do
+  let(:entity) { described_class.new(mr_diff_report) }
+  let(:mr_diff_report) { Gitlab::Ci::Reports::CodequalityMrDiff.new(codequality_report) }
+  let(:codequality_report) { Gitlab::Ci::Reports::CodequalityReports.new }
+  let(:degradation_1) { build(:codequality_degradation_1) }
+  let(:degradation_2) { build(:codequality_degradation_2) }
+
+  describe '#as_json' do
+    subject(:report) { entity.as_json }
+
+    context 'when quality report has degradations' do
+      before do
+        codequality_report.add_degradation(degradation_1)
+        codequality_report.add_degradation(degradation_2)
+      end
+
+      it 'contains correct codequality mr diff report', :aggregate_failures do
+        expect(report[:files].keys).to eq(["file_a.rb"])
+        expect(report[:files]["file_a.rb"].first).to include(:line, :description, :severity)
+      end
+    end
+  end
+end