Support file for RSpec aimed at DRYing up ActiveModel Serializer specs.

Example

describe BlogPostSerializer do
  include_context "serializer spec"

  let(:model) do
    BlogPost.new({
      title: "Lol",
      author_attributes: { email: "john@doe.com"}
    })
  end

  within('blog_post') do
    its(['title']).should eq('Lol')

    within('author') do
      its(['email']).should eq('john@doe.com')
    end
  end
end

Serializer Spec shared context

# spec/shared/serializer_spec.rb
shared_context "serializer spec" do
  let(:serialized_model) { described_class.new(model).as_json.with_indifferent_access }
  subject { serialized_model }

  def self.within(*scopes, &blk)
    context "within" do
      around(:each) do |example|
        original_scopes = (@scopes ||= [])

        @scopes += scopes
        example.run
        @scopes = original_scopes
      end

      subject do
        @scopes.inject(serialized_model) do |model, scope|
          model[scope]
        end
      end
      
      describe "#{scopes.join(' ')}", &blk
    end
  end
end