require 'spec_helper'

describe 'integration of sum' do
  describe 'with negative numbers' do
    subject do
      Danica::Sum.new(Danica::Negative.new(1), 2, Danica::Negative.new(3), 4)
    end

    describe '#to_gnu' do
      it 'returns the correct string' do
        expect(subject.to_gnu).to eq('-1 + 2 -3 + 4')
      end
    end

    describe '#to_tex' do
      it 'returns the correct string' do
        expect(subject.to_tex).to eq('-1 + 2 -3 + 4')
      end
    end
  end
end