Ignore sources node from cobertura XML

changelogs/unreleased/eb-skip-cobertura-sources.yml

+---
+title: Ignore the sources node from the cobertura XML
+merge_request: 39385
+author:
+type: fixed

lib/gitlab/ci/parsers/coverage/cobertura.rb

@@ -28,6 +28,8 @@ module Gitlab
           end
 
           def parse_node(key, value, coverage_report)
+            return if key == 'sources'
+
             if key == 'class'
               Array.wrap(value).each do |item|
                 parse_class(item, coverage_report)

spec/lib/gitlab/ci/parsers/coverage/cobertura_spec.rb

@@ -19,6 +19,41 @@ RSpec.describe Gitlab::Ci::Parsers::Coverage::Cobertura do
         end
       end
 
+      context 'when there is a <sources>' do
+        shared_examples_for 'ignoring sources' do
+          it 'parses XML without errors' do
+            expect { subject }.not_to raise_error
+
+            expect(coverage_report.files).to eq({})
+          end
+        end
+
+        context 'and has a single source' do
+          let(:cobertura) do
+            <<-EOF.strip_heredoc
+            <sources>
+              <source>project/src</source>
+            </sources>
+            EOF
+          end
+
+          it_behaves_like 'ignoring sources'
+        end
+
+        context 'and has multiple sources' do
+          let(:cobertura) do
+            <<-EOF.strip_heredoc
+            <sources>
+              <source>project/src/foo</source>
+              <source>project/src/bar</source>
+            </sources>
+            EOF
+          end
+
+          it_behaves_like 'ignoring sources'
+        end
+      end
+
       context 'when there is a single <class>' do
         context 'with no lines' do
           let(:cobertura) do