describe PostInteractionPresenter do
  let(:status_message_without_participation) {
    FactoryGirl.create(:status_message_without_participation)
  }
  let(:status_message_with_participations) {
    FactoryGirl.create(:status_message_with_participations, participants: [alice, bob])
  }

  context "with an user" do
    context "without a participation" do
      let(:presenter) { PostInteractionPresenter.new(status_message_without_participation, alice) }

      it "returns an empty array for participations" do
        expect(presenter.as_json[:participations]).to be_empty
      end
    end

    context "with a participation" do
      let(:presenter) { PostInteractionPresenter.new(status_message_with_participations, alice) }

      it "returns the users own participation only" do
        expect(presenter.as_json[:participations]).to eq [alice.participations.first.as_api_response(:backbone)]
      end
    end
  end

  context "without an user" do
    let(:presenter) { PostInteractionPresenter.new(status_message_with_participations, nil) }

    it "returns an empty array" do
      expect(presenter.as_json[:participations]).to be_empty
    end
  end
end