Solution to first TDD exercise

signup_spec.rb

require "spec_helper"
require "signup"

describe Signup do
  let(:account) { double('account') }
  let(:user) { double('user') }
  let(:signup) { Signup.new(email: "user@example.com", account_name: "Example") }

  before(:each) do
    allow(Account).to receive(:create!).and_return(account)
    allow(User).to receive(:create!).and_return(user)
  end

  describe "#save" do
    it "creates an account with one user" do
      result = signup.save

      expect(Account).to have_received(:create!)
      expect(result).to be(true)
    end
  end

  describe "#user" do
    it "returns the user created by #save" do
      signup.save
      expect(signup.user).to eq(user)
    end
  end
end