spec が強制終了してる？

main_spec.rb

class User
  attr_accessor :name

  def initialize(name = '')
    @name = name
  end

  def initWithCoder(decoder)
    self.init
    self.name = decoder.decodeObjectForKey('name')
    self
  end

  def encodeWithCoder(encoder)
    encoder.encodeObject(self.name, forKey: 'name')
  end
end

describe "Application 'nscoding'" do
  before do
    @user = User.new('foo')
  end

  it 'nameの値が正しい' do
    @user.name.should == 'foo'
  end

  it 'NSCoding準拠' do
    @user.respond_to?(:'initWithCoder:').should == true
    @user.respond_to?(:'encodeWithCoder:').should == true
  end

# ここから
  it 'save -> load できる' do
    user_as_data = NSKeyedArchiver.archivedDataWithRootObject(@user)
    loaded_user = NSKeyedUnarchiver.unarchiveObjectWithData(user_as_data)
    loaded_user.name.should == 'foo'
  end
# ここまで
end