1 files changed, 92 insertions, 0 deletions
diff --git a/spec/serializers/codequality_reports_comparer_serializer_spec.rb b/spec/serializers/codequality_reports_comparer_serializer_spec.rb
new file mode 100644
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+++ b/spec/serializers/codequality_reports_comparer_serializer_spec.rb
@@ -0,0 +1,92 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe CodequalityReportsComparerSerializer do
+  let(:project) { double(:project) }
+  let(:serializer) { described_class.new(project: project).represent(comparer) }
+  let(:comparer) { Gitlab::Ci::Reports::CodequalityReportsComparer.new(base_report, head_report) }
+  let(:base_report) { Gitlab::Ci::Reports::CodequalityReports.new }
+  let(:head_report) { Gitlab::Ci::Reports::CodequalityReports.new }
+  let(:degradation_1) do
+    {
+      "categories": [
+        "Complexity"
+      ],
+      "check_name": "argument_count",
+      "content": {
+        "body": ""
+      },
+      "description": "Method `new_array` has 12 arguments (exceeds 4 allowed). Consider refactoring.",
+      "fingerprint": "15cdb5c53afd42bc22f8ca366a08d547",
+      "location": {
+        "path": "foo.rb",
+        "lines": {
+          "begin": 10,
+          "end": 10
+        }
+      },
+      "other_locations": [],
+      "remediation_points": 900000,
+      "severity": "major",
+      "type": "issue",
+      "engine_name": "structure"
+    }.with_indifferent_access
+  end
+
+  let(:degradation_2) do
+    {
+      "type": "Issue",
+      "check_name": "Rubocop/Metrics/ParameterLists",
+      "description": "Avoid parameter lists longer than 5 parameters. [12/5]",
+      "categories": [
+        "Complexity"
+      ],
+      "remediation_points": 550000,
+      "location": {
+        "path": "foo.rb",
+        "positions": {
+          "begin": {
+            "column": 14,
+            "line": 10
+          },
+          "end": {
+            "column": 39,
+            "line": 10
+          }
+        }
+      },
+      "content": {
+        "body": "This cop checks for methods with too many parameters.\nThe maximum number of parameters is configurable.\nKeyword arguments can optionally be excluded from the total count."
+      },
+      "engine_name": "rubocop",
+      "fingerprint": "ab5f8b935886b942d621399f5a2ca16e",
+      "severity": "minor"
+    }.with_indifferent_access
+  end
+
+  describe '#to_json' do
+    subject { serializer.as_json }
+
+    context 'when base report has error and head has a different error' do
+      before do
+        base_report.add_degradation(degradation_1)
+        head_report.add_degradation(degradation_2)
+      end
+
+      it 'matches the schema' do
+        expect(subject).to match_schema('entities/codequality_reports_comparer')
+      end
+    end
+
+    context 'when base report has no error and head has errors' do
+      before do
+        head_report.add_degradation(degradation_1)
+      end
+
+      it 'matches the schema' do
+        expect(subject).to match_schema('entities/codequality_reports_comparer')
+      end
+    end
+  end
+end