PriorityList Rspec unit tests

priority_list_spec.rb

# frozen_string_literal: true

describe PriorityList do
  let(:list) { [1, 4, 6, 3, 7, 3, 0, 20, 3] }

  describe '#priority_list' do
    context 'ascending mode' do
      before do
        allow(ENV).to receive(:fetch).with('APPLICATION_MODE', 'ascending')
                                     .and_return('ascending')
      end
      it ' sorts ascending' do
        subject = described_class.new(list)
        expect(subject.priority_list).to eq list.sort
      end
    end
    context 'descending mode' do
      before do
        allow(ENV).to receive(:fetch).with('APPLICATION_MODE', 'ascending')
                                     .and_return('descending')
      end
      it ' sorts descending' do
        subject = described_class.new(list)
        expect(subject.priority_list).to eq list.sort.reverse
      end
    end
    context 'default mode' do
      it ' sorts ascending' do
        subject = described_class.new(list)
        expect(subject.priority_list).to eq list.sort
      end
    end
  end
end