Capture due date when importing milestones from Github

changelogs/unreleased/57612-github-importer-ignores-milestone-due_date.yml

+---
+title: Capture due date when importing milestones from Github
+merge_request: 25182
+author: dstanley
+type: changed

lib/gitlab/github_import/importer/milestones_importer.rb

@@ -42,6 +42,7 @@ module Gitlab
             description: milestone.description,
             project_id: project.id,
             state: state_for(milestone),
+            due_date: milestone.due_on.to_date,
             created_at: milestone.created_at,
             updated_at: milestone.updated_at
           }

spec/lib/gitlab/github_import/importer/milestones_importer_spec.rb

@@ -4,6 +4,7 @@ describe Gitlab::GithubImport::Importer::MilestonesImporter, :clean_gitlab_redis
   let(:project) { create(:project, import_source: 'foo/bar') }
   let(:client) { double(:client) }
   let(:importer) { described_class.new(project, client) }
+  let(:due_on) { Time.new(2017, 2, 1, 12, 00) }
   let(:created_at) { Time.new(2017, 1, 1, 12, 00) }
   let(:updated_at) { Time.new(2017, 1, 1, 12, 15) }
 
@@ -14,6 +15,7 @@ describe Gitlab::GithubImport::Importer::MilestonesImporter, :clean_gitlab_redis
       title: '1.0',
       description: 'The first release',
       state: 'open',
+      due_on: due_on,
       created_at: created_at,
       updated_at: updated_at
     )
@@ -98,6 +100,10 @@ describe Gitlab::GithubImport::Importer::MilestonesImporter, :clean_gitlab_redis
         expect(milestone_hash[:state]).to eq(:active)
       end
 
+      it 'includes the due date' do
+        expect(milestone_hash[:due_date]).to eq(due_on.to_date)
+      end
+
       it 'includes the created timestamp' do
         expect(milestone_hash[:created_at]).to eq(created_at)
       end