Count the Contexts

bigger_user_spec.rb

RSpec.describe User do
  describe '#full_name' do
    subject do 
      described_class.new(first_name, middle_name, last_name) 
    end
    let(:first_name) { 'Roy' }
    let(:last_name) { 'Biv' }

    context 'middle name is given' do
      let(:middle_name) { 'Gee' }
      it { is_expected.to eq('Roy G. Biv') }
    end

    context 'middle name is not given' do
      let(:middle_name) { nil }
      it { is_expected.to eq('Roy Biv') }
    end
  end
end

frequent_flier.rb

class FrequentFlier
  def build(customer, starting_balance = nil, status_level = nil)
    starting_balance = promotion_starting_balance || starting_balance || 0
    status_level = promotion_starting_status || status_level

    # Family members of airline employees get so many perks!
    if customer.related_to_employee?
      starting_balance += 10_000
      
      if ![:diamond, :platinum].include?(status_level)
        status_level = :gold
      end
    end

    {
      account_number: AccountNumber.generate,
      balance: starting_balance || 0,
      status_level: status_level || nil,
      miles_multiplier: customer&.miles_multiplier || 1
    }
  end
end

frequent_flier_spec.rb

RSpec.describe FrequentFlier do
  subject do 
    described_class.build(customer, starting_balance, status_level)
  end

  let(:customer) do
    build(:customer, related_to_employee: related_to_employee)
  end
  let(:starting_balance) { 1_000 }
  let(:status_level) { nil }

  context 'customer is related to an employee' do
    let(:related_to_employee) { true }

    it do
      is_expected.to eq({
        account_number: an_instance_of(AccountNumber),
        balance: 11_000,
        status_level: :gold,
        miles_multiplier: 1
      })
    end
  end

  context 'customer is not related to an employee' do
    let(:related_to_employee) { false }

    it do
      is_expected.to eq({
        account_number: an_instance_of(AccountNumber),
        balance: 1_000,
        status_level: nil,
        miles_multiplier: 1
      })
    end
  end
end

test_user.rb

class TestUser
  def test_full_name_includes_the_middle_initial_when_middle_name_is_given
    user = User.new('Roy', 'Gee', 'Biv')
    assert user.full_name == 'Roy G. Biv'
  end
end

test_user_again.rb

class TestUser
  def test_full_name_includes_the_middle_initial_when_middle_name_is_given
    user = User.new('Roy', 'Gee', 'Biv')
    assert user.full_name == 'Roy G. Biv'
  end

  def test_full_name_does_not_include_middle_initial_when_no_middle_name_is_given
    user = User.new('Roy', nil, 'Biv')
    assert user.full_name == 'Roy Biv'
  end
end

user_spec.rb

RSpec.describe User do
  describe '#full_name' do
    subject do 
      described_class.new(first_name, middle_name, last_name) 
    end
    let(:first_name) { 'Roy' }
    let(:last_name) { 'Biv' }

    context 'middle name is given' do
      let(:middle_name) { 'Gee' }
      it { is_expected.to eq('Roy G. Biv') }
    end
  end
end