require 'spec_helper'

describe Banzai::IssuableExtractor, lib: true do
  let(:project) { create(:empty_project) }
  let(:user) { create(:user) }
  let(:extractor) { described_class.new(project, user) }
  let(:issue) { create(:issue, project: project) }
  let(:merge_request) { create(:merge_request, source_project: project) }
  let(:issue_link) do
    html_to_node(
      "<a href='' data-issue='#{issue.id}' data-reference-type='issue' class='gfm'>text</a>"
    )
  end
  let(:merge_request_link) do
    html_to_node(
      "<a href='' data-merge-request='#{merge_request.id}' data-reference-type='merge_request' class='gfm'>text</a>"
    )
  end

  def html_to_node(html)
    Nokogiri::HTML.fragment(
      html
    ).children[0]
  end

  it 'returns instances of issuables for nodes with references' do
    result = extractor.extract([issue_link, merge_request_link])

    expect(result).to eq(issue_link => issue, merge_request_link => merge_request)
  end

  describe 'caching' do
    before do
      RequestStore.begin!
    end

    after do
      RequestStore.end!
      RequestStore.clear!
    end

    it 'saves records to cache' do
      extractor.extract([issue_link, merge_request_link])

      second_call_queries = ActiveRecord::QueryRecorder.new do
        extractor.extract([issue_link, merge_request_link])
      end.count

      expect(second_call_queries).to eq 0
    end
  end
end
