/spec/controllers/projects/merge_requests_controller_spec.rb

require 'spec_helper'

describe Projects::MergeRequestsController do
  let(:project) { create(:project) }
  let(:user)    { create(:user) }
  let(:merge_request) { create(:merge_request_with_diffs, target_project: project, source_project: project) }

  before do
    sign_in(user)
    project.team << [user, :master]
  end

  describe '#new' do
    context 'merge request that removes a submodule' do
      render_views

      let(:fork_project) { create(:forked_project_with_submodules) }

      before do
        fork_project.team << [user, :master]
      end

      it 'renders it' do
        get :new,
            namespace_id: fork_project.namespace.to_param,
            project_id: fork_project.to_param,
            merge_request: {
              source_branch: 'remove-submodule',
              target_branch: 'master'
            }

        expect(response).to be_success
      end
    end
  end

  describe "#show" do
    shared_examples "export merge as" do |format|
      it "should generally work" do
        get(:show,
            namespace_id: project.namespace.to_param,
            project_id: project.to_param,
            id: merge_request.iid,
            format: format)

        expect(response).to be_success
      end

      it "should generate it" do
        expect_any_instance_of(MergeRequest).to receive(:"to_#{format}")

        get(:show,
            namespace_id: project.namespace.to_param,
            project_id: project.to_param,
            id: merge_request.iid,
            format: format)
      end

      it "should render it" do
        get(:show,
            namespace_id: project.namespace.to_param,
            project_id: project.to_param,
            id: merge_request.iid,
            format: format)

        expect(response.body).to eq(merge_request.send(:"to_#{format}").to_s)
      end

      it "should not escape Html" do
        allow_any_instance_of(MergeRequest).to receive(:"to_#{format}").
          and_return('HTML entities &<>" ')

        get(:show,
            namespace_id: project.namespace.to_param,
            project_id: project.to_param,
            id: merge_request.iid,
            format: format)

        expect(response.body).not_to include('&amp;')
        expect(response.body).not_to include('&gt;')
        expect(response.body).not_to include('&lt;')
        expect(response.body).not_to include('&quot;')
      end
    end

    describe "as diff" do
      it "triggers workhorse to serve the request" do
        get(:show,
            namespace_id: project.namespace.to_param,
            project_id: project.to_param,
            id: merge_request.iid,
            format: :diff)

        expect(response.headers[Gitlab::Workhorse::SEND_DATA_HEADER]).to start_with("git-diff:")
      end
    end

    describe "as patch" do
      include_examples "export merge as", :patch
      let(:format) { :patch }

      it "should really be a git email patch with commit" do
        get(:show,
            namespace_id: project.namespace.to_param,
            project_id: project.to_param,
            id: merge_request.iid, format: format)

        expect(response.body[0..100]).to start_with("From #{merge_request.commits.last.id}")
      end

      it "should contain git diffs" do
        get(:show,
            namespace_id: project.namespace.to_param,
            project_id: project.to_param,
            id: merge_request.iid,
            format: format)

        expect(response.body).to match(/^diff --git/)
      end
    end
  end

  describe 'GET #index' do
    def get_merge_requests
      get :index,
          namespace_id: project.namespace.to_param,
          project_id: project.to_param,
          state: 'opened'
    end

    context 'when filtering by opened state' do

      context 'with opened merge requests' do
        it 'should list those merge requests' do
          get_merge_requests

          expect(assigns(:merge_requests)).to include(merge_request)
        end
      end

      context 'with reopened merge requests' do
        before do
          merge_request.close!
          merge_request.reopen!
        end

        it 'should list those merge requests' do
          get_merge_requests

          expect(assigns(:merge_requests)).to include(merge_request)
        end
      end

    end
  end

  describe 'PUT #update' do
    context 'there is no source project' do
      let(:project)       { create(:project) }
      let(:fork_project)  { create(:forked_project_with_submodules) }
      let(:merge_request) { create(:merge_request, source_project: fork_project, source_branch: 'add-submodule-version-bump', target_branch: 'master', target_project: project) }

      before do
        fork_project.build_forked_project_link(forked_to_project_id: fork_project.id, forked_from_project_id: project.id)
        fork_project.save
        merge_request.reload
        fork_project.destroy
      end

      it 'closes MR without errors' do
        post :update,
            namespace_id: project.namespace.path,
            project_id: project.path,
            id: merge_request.iid,
            merge_request: {
              state_event: 'close'
            }

        expect(response).to redirect_to([merge_request.target_project.namespace.becomes(Namespace), merge_request.target_project, merge_request])
        expect(merge_request.reload.closed?).to be_truthy
      end
    end
  end

  describe 'POST #merge' do
    let(:base_params) do
      {
        namespace_id: project.namespace.path,
        project_id: project.path,
        id: merge_request.iid,
        format: 'raw'
      }
    end

    context 'when the user does not have access' do
      before do
        project.team.truncate
        project.team << [user, :reporter]
        post :merge, base_params
      end

      it 'returns not found' do
        expect(response).to be_not_found
      end
    end

    context 'when the merge request is not mergeable' do
      before do
        merge_request.update_attributes(title: "WIP: #{merge_request.title}")

        post :merge, base_params
      end

      it 'returns :failed' do
        expect(assigns(:status)).to eq(:failed)
      end
    end

    context 'when the sha parameter does not match the source SHA' do
      before { post :merge, base_params.merge(sha: 'foo') }

      it 'returns :sha_mismatch' do
        expect(assigns(:status)).to eq(:sha_mismatch)
      end
    end

    context 'when the sha parameter matches the source SHA' do
      def merge_with_sha
        post :merge, base_params.merge(sha: merge_request.source_sha)
      end

      it 'returns :success' do
        merge_with_sha

        expect(assigns(:status)).to eq(:success)
      end

      it 'starts the merge immediately' do
        expect(MergeWorker).to receive(:perform_async).with(merge_request.id, anything, anything)

        merge_with_sha
      end

      context 'when merge_when_build_succeeds is passed' do
        def merge_when_build_succeeds
          post :merge, base_params.merge(sha: merge_request.source_sha, merge_when_build_succeeds: '1')
        end

        before do
          create(:ci_empty_pipeline, project: project, sha: merge_request.source_sha, ref: merge_request.source_branch)
        end

        it 'returns :merge_when_build_succeeds' do
          merge_when_build_succeeds

          expect(assigns(:status)).to eq(:merge_when_build_succeeds)
        end

        it 'sets the MR to merge when the build succeeds' do
          service = double(:merge_when_build_succeeds_service)

          expect(MergeRequests::MergeWhenBuildSucceedsService).to receive(:new).with(project, anything, anything).and_return(service)
          expect(service).to receive(:execute).with(merge_request)

          merge_when_build_succeeds
        end
      end
    end
  end

  describe "DELETE #destroy" do
    it "denies access to users unless they're admin or project owner" do
      delete :destroy, namespace_id: project.namespace.path, project_id: project.path, id: merge_request.iid

      expect(response.status).to eq(404)
    end

    context "when the user is owner" do
      let(:owner)     { create(:user) }
      let(:namespace) { create(:namespace, owner: owner) }
      let(:project)   { create(:project, namespace: namespace) }

      before { sign_in owner }

      it "deletes the merge request" do
        delete :destroy, namespace_id: project.namespace.path, project_id: project.path, id: merge_request.iid

        expect(response.status).to eq(302)
        expect(controller).to set_flash[:notice].to(/The merge request was successfully deleted\./).now
      end
    end
  end

  describe 'GET diffs' do
    def go(format: 'html')
      get :diffs,
          namespace_id: project.namespace.to_param,
          project_id: project.to_param,
          id: merge_request.iid,
          format: format
    end

    context 'as html' do
      it 'renders the diff template' do
        go

        expect(response).to render_template('diffs')
      end
    end

    context 'as json' do
      it 'renders the diffs template to a string' do
        go format: 'json'

        expect(response).to render_template('projects/merge_requests/show/_diffs')
        expect(JSON.parse(response.body)).to have_key('html')
      end
    end

    context 'with forked projects with submodules' do
      render_views

      let(:project) { create(:project) }
      let(:fork_project) { create(:forked_project_with_submodules) }
      let(:merge_request) { create(:merge_request_with_diffs, source_project: fork_project, source_branch: 'add-submodule-version-bump', target_branch: 'master', target_project: project) }

      before do
        fork_project.build_forked_project_link(forked_to_project_id: fork_project.id, forked_from_project_id: project.id)
        fork_project.save
        merge_request.reload
      end

      it 'renders' do
        go format: 'json'

        expect(response).to be_success
        expect(response.body).to have_content('Subproject commit')
      end
    end
  end

  describe 'GET diffs with ignore_whitespace_change' do
    def go(format: 'html')
      get :diffs,
          namespace_id: project.namespace.to_param,
          project_id: project.to_param,
          id: merge_request.iid,
          format: format,
          w: 1
    end

    context 'as html' do
      it 'renders the diff template' do
        go

        expect(response).to render_template('diffs')
      end
    end

    context 'as json' do
      it 'renders the diffs template to a string' do
        go format: 'json'

        expect(response).to render_template('projects/merge_requests/show/_diffs')
        expect(JSON.parse(response.body)).to have_key('html')
      end
    end
  end

  describe 'GET diffs with view' do
    def go(extra_params = {})
      params = {
        namespace_id: project.namespace.to_param,
        project_id:   project.to_param,
        id:           merge_request.iid
      }

      get :diffs, params.merge(extra_params)
    end

    it 'saves the preferred diff view in a cookie' do
      go view: 'parallel'

      expect(response.cookies['diff_view']).to eq('parallel')
    end
  end

  describe 'GET commits' do
    def go(format: 'html')
      get :commits,
          namespace_id: project.namespace.to_param,
          project_id: project.to_param,
          id: merge_request.iid,
          format: format
    end

    context 'as html' do
      it 'renders the show template' do
        go

        expect(response).to render_template('show')
      end
    end

    context 'as json' do
      it 'renders the commits template to a string' do
        go format: 'json'

        expect(response).to render_template('projects/merge_requests/show/_commits')
        expect(JSON.parse(response.body)).to have_key('html')
      end
    end
  end
end