require 'spec_helper'
require Rails.root.join('db', 'migrate', '20170912113435_clean_stages_statuses_migration.rb')

describe CleanStagesStatusesMigration, :migration, :sidekiq, :redis do
  let(:migration) { spy('migration') }

  before do
    allow(Gitlab::BackgroundMigration::MigrateStageStatus)
      .to receive(:new).and_return(migration)
  end

  context 'when there are pending background migrations' do
    it 'processes pending jobs synchronously' do
      Sidekiq::Testing.disable! do
        BackgroundMigrationWorker
          .perform_in(2.minutes, 'MigrateStageStatus', [1, 1])
        BackgroundMigrationWorker
          .perform_async('MigrateStageStatus', [1, 1])

        migrate!

        expect(migration).to have_received(:perform).with(1, 1).twice
      end
    end
  end

  context 'when there are no background migrations pending' do
    it 'does nothing' do
      Sidekiq::Testing.disable! do
        migrate!

        expect(migration).not_to have_received(:perform)
      end
    end
  end

  context 'when there are still unmigrated stages afterwards' do
    let(:stages) { table('ci_stages') }

    before do
      stages.create!(status: nil, name: 'build')
      stages.create!(status: nil, name: 'test')
    end

    it 'migrates statuses sequentially in batches' do
      migrate!

      expect(migration).to have_received(:perform).once
    end
  end
end