array combiner

array_combiner.rb

# Account = Struct.new(:id, :last_active)

describe 'pruning expired accounts' do
  let(:acc1) { Account.new(1, Date.today) }
  let(:acc2) { Account.new(2, Date.today) }
  let(:acc3) { Account.new(3, Date.today) }
  
  describe 'when the first account is expired' do
    let(:acc1) { Account.new(1, Date.today - 45) }
    
    describe 'when the second account is expired' do
      let(:acc2) { Account.new(1, Date.today - 45) }

      describe 'when the third account is not expired' do
        it 'returns the third account' do
          expect(AccountPruner.prune(acc1, acc2, acc3)).to eq([acc3])
        end
      end
      
      describe 'when the third account is expired' do
        let(:acc3) { Account.new(1, Date.today - 45) }
        
        it 'returns no accounts' do
          expect(AccountPruner.prune(acc1, acc2, acc3)).to eq([])
        end
      end
    end
    
    # ...continue for all combinations we want to test
  end
end