Using verified doubles

By default rspec verified doubles dont support dynamic methods on instance_double. rspec-rails enabled this support for column methods through an extension.

Given a file named "spec/models/widget_spec.rb" with:

require "rails_helper"

RSpec.describe Widget, type: :model do
  it "has one after adding one" do
    instance_double("Widget", :name => "my name")
  end
end

When I run rspec spec/models/widget_spec.rb

Then the examples should all pass.