require './hashmap.rb'

RSpec.describe HashMap do
  subject(:map) { HashMap.new }

  context 'when empty' do
    it { is_expected.to be_empty }

    describe '#count' do
      subject { map.count }
      it { is_expected.to eq 0 }
    end

    describe '#[]' do
      subject { map["fruit"] }
      it { is_expected.to eq nil }
    end

    describe '#[]=' do
      it 'updates the count' do
        expect { map["fruit"] = %w(apples oranges bananas) }.to change { map.count }.by 1
      end
    end

    describe '#keys' do
      subject { map.keys }
      it { is_expected.to be_empty }
    end
  end

  context 'with some content' do
    subject(:map) do
      HashMap.new.tap do |map|
        map["fruit"] = %w(apples oranges bananas)
        map["vegetables"] = %w(potatoes carrots)
        map["meats"] = %w(beef pork chicken lamb)
      end
    end

    it { is_expected.not_to be_empty }

    describe '#count' do
      subject { map.count }
      it { is_expected.to eq 3 }
    end

    describe '#[]' do
      subject { map["fruit"] }
      it { is_expected.to eq %w(apples oranges bananas) }
    end

    describe '#keys' do
      subject { map.keys }
      it { is_expected.to eq %w(fruit meats vegetables) }
    end

    context 're-setting a key' do
      it 'does not change the count' do
        expect { map["fruit"] = %w(pineapples) }
          .not_to change { map.count }
      end
    end

    describe '#delete' do
      %w(fruit vegetables meats).each do |key|
        it "deletes #{key}" do
          expect { map.delete(key) }.to change { map.count }.by -1
        end
      end
    end
  end
end