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diff --git a/spec/serializers/codequality_degradation_entity_spec.rb b/spec/serializers/codequality_degradation_entity_spec.rb
new file mode 100644
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+++ b/spec/serializers/codequality_degradation_entity_spec.rb
@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe CodequalityDegradationEntity do
+  let(:entity) { described_class.new(codequality_degradation) }
+
+  describe '#as_json' do
+    subject { entity.as_json }
+
+    context 'when codequality contains an error' do
+      context 'when line is included in location' do
+        let(:codequality_degradation) 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
+
+        it 'contains correct codequality degradation details', :aggregate_failures do
+          expect(subject[:description]).to eq("Method `new_array` has 12 arguments (exceeds 4 allowed). Consider refactoring.")
+          expect(subject[:severity]).to eq("major")
+          expect(subject[:file_path]).to eq("foo.rb")
+          expect(subject[:line]).to eq(10)
+        end
+      end
+
+      context 'when line is included in positions' do
+        let(:codequality_degradation) 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": 24,
+                  "line": 14
+                },
+                "end": {
+                  "column": 49,
+                  "line": 14
+                }
+              }
+            },
+            "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
+
+        it 'contains correct codequality degradation details', :aggregate_failures do
+          expect(subject[:description]).to eq("Avoid parameter lists longer than 5 parameters. [12/5]")
+          expect(subject[:severity]).to eq("minor")
+          expect(subject[:file_path]).to eq("foo.rb")
+          expect(subject[:line]).to eq(14)
+        end
+      end
+    end
+  end
+end