decorator_spec.rb

require 'spec_helper'

describe API::Decorator do
  describe ".safe_attributes" do
  # class WidgetDecorator < API::Decorator
  #   safe_attributes :safe
  # end
  #
  # widget = Widget.new(safe: "foo", unsafe: "bar")
  #
  # decorated_widget = WidgetDecorator.new(widget)
  # decorated_widget.to_json # => { "safe": "foo" }
  it "uses the attribute filter when generating JSON" do

    # expected result from json
    attrs = { safe: "AAA" }

    # fake our record and stub the call to as_json
    widget = double("Widget")
    widget.stub(:as_json) { ActiveSupport::JSON.encode(attrs) }

    # and set up some message expectations
    expect(widget).to receive(:as_json).with(:safe, :also_safe)

    # configure our decorator
    decorator = Class.new(API::Decorator)
    decorator.safe_attributes :safe

    # and uses it to generate some JSON
    outcome = ActiveSupport::JSON.decode(decorator.new(widget).to_json)

    expect(outcome).to have_key(:safe)
    expect(outcome).to_not have_key(:unsafe)
    expect(outcome[:safe]).to eq "AAA"
  end
end