actually, factory_girl is extremely good

build_stubbed.rb

RSpec.describe 'FactoryGirl.build_stubbed' do
  let(:stubbed_model) { FactoryGirl.build_stubbed(:step_progress) }

  it 'doesnt allow #save' do
    expect {
      stubbed_model.save
    }.to raise_error RuntimeError, /stubbed models are not allowed to access the database/
  end

  it 'doesnt allow #update_attributes' do
    expect {
      stubbed_model.update_attributes(created_at: Time.now)
    }.to raise_error RuntimeError, /stubbed models are not allowed to access the database/
  end

  it 'allows #save!' do
    stubbed_model.save!
  end

  it 'allows #touch' do
    stubbed_model.touch(:last_completed_at)
  end
end