Add external pull requests to Project Migration

  - Add external pull requests to Project Migration
    when using Group Migration tool

lib/bulk_imports/projects/pipelines/external_pull_requests_pipeline.rb

+# frozen_string_literal: true
+
+module BulkImports
+  module Projects
+    module Pipelines
+      class ExternalPullRequestsPipeline
+        include NdjsonPipeline
+
+        relation_name 'external_pull_requests'
+
+        extractor ::BulkImports::Common::Extractors::NdjsonExtractor, relation: relation
+      end
+    end
+  end
+end

lib/bulk_imports/projects/stage.rb

@@ -31,6 +31,10 @@ module BulkImports
             pipeline: BulkImports::Projects::Pipelines::MergeRequestsPipeline,
             stage: 4
           },
+          external_pull_requests: {
+            pipeline: BulkImports::Projects::Pipelines::ExternalPullRequestsPipeline,
+            stage: 4
+          },
           uploads: {
             pipeline: BulkImports::Common::Pipelines::UploadsPipeline,
             stage: 5

spec/lib/bulk_imports/projects/pipelines/external_pull_requests_pipeline_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe BulkImports::Projects::Pipelines::ExternalPullRequestsPipeline do
+  let_it_be(:project) { create(:project) }
+  let_it_be(:bulk_import) { create(:bulk_import) }
+  let_it_be(:entity) { create(:bulk_import_entity, :project_entity, project: project, bulk_import: bulk_import) }
+  let_it_be(:tracker) { create(:bulk_import_tracker, entity: entity) }
+  let_it_be(:context) { BulkImports::Pipeline::Context.new(tracker) }
+
+  let(:attributes) { {} }
+  let(:external_pr) { project.external_pull_requests.last }
+  let(:external_pull_request) do
+    {
+      'pull_request_iid' => 4,
+      'source_branch' => 'feature',
+      'target_branch' => 'main',
+      'source_repository' => 'repository',
+      'target_repository' => 'repository',
+      'source_sha' => 'abc',
+      'target_sha' => 'xyz',
+      'status' => 'open',
+      'created_at' => '2019-12-24T14:04:50.053Z',
+      'updated_at' => '2019-12-24T14:05:18.138Z'
+    }.merge(attributes)
+  end
+
+  subject(:pipeline) { described_class.new(context) }
+
+  describe '#run' do
+    before do
+      allow_next_instance_of(BulkImports::Common::Extractors::NdjsonExtractor) do |extractor|
+        allow(extractor).to receive(:remove_tmp_dir)
+        allow(extractor).to receive(:extract).and_return(BulkImports::Pipeline::ExtractedData.new(data: [[external_pull_request, 0]]))
+      end
+
+      pipeline.run
+    end
+
+    it 'imports external pull request', :aggregate_failures do
+      expect(external_pr.pull_request_iid).to eq(external_pull_request['pull_request_iid'])
+      expect(external_pr.source_branch).to eq(external_pull_request['source_branch'])
+      expect(external_pr.target_branch).to eq(external_pull_request['target_branch'])
+      expect(external_pr.status).to eq(external_pull_request['status'])
+      expect(external_pr.created_at).to eq(external_pull_request['created_at'])
+      expect(external_pr.updated_at).to eq(external_pull_request['updated_at'])
+    end
+
+    context 'when status is closed' do
+      let(:attributes) { { 'status' => 'closed' } }
+
+      it 'imports closed external pull request' do
+        expect(external_pr.status).to eq(attributes['status'])
+      end
+    end
+
+    context 'when from fork' do
+      let(:attributes) { { 'source_repository' => 'source' } }
+
+      it 'does not create external pull request' do
+        expect(external_pr).to be_nil
+      end
+    end
+  end
+end

spec/lib/bulk_imports/projects/stage_spec.rb

@@ -11,6 +11,7 @@ RSpec.describe BulkImports::Projects::Stage do
       [3, BulkImports::Projects::Pipelines::IssuesPipeline],
       [4, BulkImports::Common::Pipelines::BoardsPipeline],
       [4, BulkImports::Projects::Pipelines::MergeRequestsPipeline],
+      [4, BulkImports::Projects::Pipelines::ExternalPullRequestsPipeline],
       [5, BulkImports::Common::Pipelines::UploadsPipeline],
       [6, BulkImports::Common::Pipelines::EntityFinisher]
     ]