gitlab-org--gitlab-foss/spec/services/merge_requests/assign_issues_service_spec.rb

require 'spec_helper'

describe MergeRequests::AssignIssuesService, services: true do
  let(:user) { create(:user) }
  let(:project) { create(:project, :public) }
  let(:issue) { create(:issue, project: project) }
  let(:merge_request) { create(:merge_request, :simple, source_project: project, author: user, description: "fixes #{issue.to_reference}") }
  let(:service) { described_class.new(project, user, merge_request: merge_request) }

  before do
    project.team << [user, :developer]
  end

  it 'finds unassigned issues fixed in merge request' do
    expect(service.assignable_issues.map(&:id)).to include(issue.id)
  end

  it 'ignores issues already assigned to any user' do
    issue.update!(assignee: create(:user))

    expect(service.assignable_issues).to be_empty
  end

  it 'ignores issues the user cannot update assignee on' do
    project.team.truncate

    expect(service.assignable_issues).to be_empty
  end

  it 'ignores all issues unless current_user is merge_request.author' do
    merge_request.update!(author: create(:user))

    expect(service.assignable_issues).to be_empty
  end

  it 'accepts precomputed data for closes_issues' do
    issue2 = create(:issue, project: project)
    service2 = described_class.new(project,
                                   user,
                                   merge_request: merge_request,
                                   closes_issues: [issue, issue2])

    expect(service2.assignable_issues.count).to eq 2
  end

  it 'assigns these to the merge request owner' do
    expect { service.execute }.to change { issue.reload.assignee }.to(user)
  end

  it 'ignores external issues' do
    external_issue = ExternalIssue.new('JIRA-123', project)
    service = described_class.new(
      project,
      user,
      merge_request: merge_request,
      closes_issues: [external_issue]
    )

    expect(service.assignable_issues.count).to eq 0
  end
end