How would you test Person in isolation?

slow_virtus_spec.rb

require "virtus"
require "rspec/autorun"

class Address < Virtus::Attribute::Object
  primitive String

  def coerce(value)
    # Simulate a slow call to an external service that normalizes the
    # address's format.
    sleep 1
    "123 Foobar Street, Berkeley, CA 94720"
  end
end

class Person
  include Virtus

  attribute :name, String
  attribute :address, Address
end

describe Person do
  subject(:person) { described_class.new(:name => "Bob", :address => "Nowhereland") }

  before do
    # Somehow stub out the coercion method for the address here so that the
    # test runs quickly in isolation.
  end

  it "has a name" do
    expect(person.name).to eq("Bob")
  end

  it "has an address" do
    expect(person.address).to eq("123 Foobar Street, Berkeley, CA 94720")
  end
end

@CapnKernul you could try this:

class Address < Virtus::Attribute::String
  def coerce(value)
    # slow stuff happens here
  end
end

before do
  Person.attribute_set[:address].stub!(:coerce).and_return("Nowhereland")
end

Alternatively you could also do this:

class NormalizedAddress
  def initialize(address)
   @address = address
  end

  def normalize
    # some slow stuff happens here
  end
  alias_method :to_str, :normalize
end

class Person
  include Virtus

  attribute :name, String
  attribute :address, String
end

Person.new(:name => 'John', :address => NormalizedAddress.new('some funky address')

@solnic Perfect! Thank you. :)