Unexpressive Specs

unexpressive.rb

describe Invoice do
  subject { described_class.new(user: user, items: items) }
  let(:user) { FactoryGirl.create(:user) }
  let(:items) { 2.times.map { FactoryGirl.create(:item, price: 100) } }

  describe '#sales_tax' do
    it 'charges sales tax when the user is in CA' do
      user.state = 'CA'
      invoice.finalize!
      expect(subject.sales_tax).to eq(200 * 0.0875)
    end

    it 'does not charge sales tax when the user is OR' do
      user.state = 'OR'
      invoice.finalize!
      expect(subject.sales_tax).to eq(0)
    end
  end
end