nickname_spec.rb

require 'rspec'
require_relative 'nickname'

describe Nickname do
  describe '#generate' do
    it { expect(subject.generate('Donald Knuth')).to eq('Donut') }
    it { expect(subject.generate('Alan Turing')).to eq('Alanin, Anting') }
    it { expect(subject.generate('Claude Shannon')).to eq('Clades, Cannon') }
    it { expect(subject.generate('Ada Lovelace')).to eq('Aloe, Alec, Alee, Alae') }
    it { expect(subject.generate('Haskell Curry')).to eq('Harry, Hurry, Herry') }
  end

  describe '#substrings' do
    it { expect(subject.substrings('abcd')).to match_array(%w(abcd abc abd acd ab ac ad a)) }
  end
end