hello_spec.rb

# frozen_string_literal: true

require 'hello'

RSpec.describe Hello do
  describe '.world' do
    subject(:world) do
      described_class.world
    end

    it { is_expected.to eq 'helloworld' }
  end

  describe '.rand_list' do
    subject(:rand_list) { described_class.method(:rand_list) }

    it 'returns a list of length' do
      expect(rand_list.call(3, 2, 9).length).to be 3
    end
    it 'returns a list with lower bound' do
      expect(rand_list.call(3, 2, 9).min).to be >= 2
    end
    it 'returns a list with upper bound' do
      expect(rand_list.call(3, 2, 9).max).to be <= 9
    end
  end

  describe '.capscrumble' do
    subject(:capscrumble) { described_class.method(:capscrumble) }

    it "finds all possible cases 'ab'" do
      expect(capscrumble.call('ab')).to match_array(%w[ab Ab aB AB])
    end

    it "finds all possible cases for 'BC'" do
      expect(capscrumble.call('BC')).to match_array(%w[bc Bc bC BC])
    end

    it 'returns a list the size of square of input length' do
      expect(capscrumble.call('ABCD').length).to be 16
    end
  end
end