Resolve "Remove duplication of Licenses in Dependency List page"

ee/changelogs/unreleased/32035-bug-dedup-licenses-dl.yml

+---
+title: Remove duplication of Licenses in Dependency List page
+merge_request: 16946
+author:
+type: fixed

ee/lib/gitlab/ci/reports/dependency_list/report.rb

@@ -18,6 +18,7 @@ module Gitlab
           def apply_license(license)
             dependencies.each do |dependency|
               next unless dependency[:name] == license[:dependency][:name]
+              next if dependency[:licenses].include?(license[:license])
 
               dependency[:licenses] << license[:license]
             end

ee/spec/lib/gitlab/ci/reports/dependency_list/report_spec.rb

@@ -16,4 +16,51 @@ describe Gitlab::Ci::Reports::DependencyList::Report do
       expect(report.dependencies).to eq([dependency])
     end
   end
+
+  describe '#apply_license' do
+    subject { report.dependencies.last[:licenses].size }
+
+    let(:license) do
+      {
+        dependency: {
+          name: 'nokogiri'
+        },
+        license: {
+          name:       'MIT',
+          url:        'http://opensource.org/licenses/mit-license'
+        }
+      }
+    end
+
+    before do
+      report.add_dependency(dependency)
+      report.apply_license(license)
+    end
+
+    context 'with matching dependency' do
+      context 'with empty license list' do
+        let(:dependency) { build :dependency }
+
+        it 'applies license' do
+          is_expected.to eq(1)
+        end
+      end
+
+      context 'with full license list' do
+        let(:dependency) { build :dependency, :with_licenses }
+
+        it 'does not apply the license a second time' do
+          is_expected.to eq(1)
+        end
+      end
+    end
+
+    context 'without matching dependency' do
+      let(:dependency) { build :dependency, name: 'irigokon' }
+
+      it 'does not apply the license at all' do
+        is_expected.to eq(0)
+      end
+    end
+  end
 end