External service test environment

external_service_spec.rb

class ExternalEnvironment
  def initialize
    @account_ids = []
    yield self
  ensure
    clean_up
  end
  
  def create_account(data)
    account = External::Account.create(data)
    
    if account.errors.empty?
      @account_ids << account.id
    else
      raise "Failed to create account due to #{account.errors.inspect}"
    end
    
    account
  end
  
  private
  
  def clean_up
    delete_accounts
  end
  
  def delete_accounts
    failed_deletions = []
    
    @account_ids.each do |id|
      success = External::Account.delete(id)
      failed_deletions << id unless success
    end
  
    raise "Failed to delete accounts #{failed_deletions.inspect}" unless failed_deletions.empty?
  end
end

describe "Some feature" do
  it "behaves as expected" do
    ExternalEnvironment.new do |service|
      account = service.create_account(name: "Peter", age: 36)

      expect(account.name).to eq "Peter"
      expect(account.age).to eq 36
    end
  end
end