new - persist! - destroy - persisted? shows resource as persisted

gistfile1.txt

require 'spec_helper'

describe ActiveTriples::Resource do
  describe '#destroy' do

    before do
      class DummyResource < ActiveTriples::Resource
        configure :type => RDF::URI('http://example.org/SomeClass'),
                  :base_uri => 'http://example.org/dummy/',
                  :repository => :default
        property :title, :predicate => RDF::DC.title
      end
    end
    after do
      Object.send(:remove_const, "DummyResource") if Object
    end

    context "when resource is persisted" do
      it "should change persisted marker to false when destroyed" do
        r = DummyResource.new('dr123')    # create and persist
        expect(r).not_to be_persisted
        r.persist!
        expect(r).to be_persisted
        
        r1 = DummyResource.new('dr123')   # read from persistent store
        expect(r1).to be_persisted
        
        r.destroy
        r2 = DummyResource.new('dr123')   # no longer in persistent store, so create
        expect(r2).not_to be_persisted        
        
        expect(r).not_to be_persisted     # TEST FAILS HERE
      end
    end
  end
end