jbuilder.rb

require 'jbuilder'
require 'jbuilder/jbuilder_template'

module Rails
  def self.cache
    @cache ||= ActiveSupport::Cache::MemoryStore.new
  end
end

# Fill the cache
JbuilderTemplate.encode FakeContext.new do |json|
  json.cached do
    json.cache! 'jbcached' do
      json.array! 0..100 do |i|
        json.a i
        json.b i
        json.c i
        json.d i
        json.e i

        json.subitems 0..100 do |j|
          json.f i.to_s * j
          json.g i.to_s * j
          json.h i.to_s * j
          json.i i.to_s * j
          json.j i.to_s * j
        end
      end
    end
  end
end

# Everthing before this is run once initialy, after is the test
__SETUP__

JbuilderTemplate.encode FakeContext.new do |json|
  json.cached do
    json.cache! 'jbcached' do
      json.array! 0..100 do |i|
        json.a i
        json.b i
        json.c i
        json.d i
        json.e i

        json.subitems 0..100 do |j|
          json.f i.to_s * j
          json.g i.to_s * j
          json.h i.to_s * j
          json.i i.to_s * j
          json.j i.to_s * j
        end
      end
    end
  end
end

lib.rb

# This is file is prepended to the test so it's run once before any
# of the test code

require "active_support"
require 'action_view'
require 'action_view/testing/resolvers'


class FakeController
  def perform_caching
    true
  end
  
  def instrument_fragment_cache(a, b)
    yield
  end

end

class FakeContext
  attr_reader :controller

  def initialize
    @controller = FakeController.new
  end
end

test.sh

gem install 'analyzer'
analyze jbuilder.rb turbostream.rb -l lib.rb

turbostream.rb

require 'turbostreamer'
require 'turbostreamer/handler'
require 'turbostreamer/template'

module Rails
  def self.cache
    @cache ||= ActiveSupport::Cache::MemoryStore.new
  end
end

# Fill the cache
TurboStreamer::Template.encode FakeContext.new do |json|
  json.object! do
    json.cached do
      json.cache! 'tscached' do
        json.array! 0..100 do |i|
          json.object! do
            json.a i
            json.b i
            json.c i
            json.d i
            json.e i

            json.subitems 0..100 do |j|
              json.object! do
                json.f i.to_s * j
                json.g i.to_s * j
                json.h i.to_s * j
                json.i i.to_s * j
                json.j i.to_s * j
              end
            end
          end
        end
      end
    end
  end
end

# Everthing before this is run once initialy, after is the test
__SETUP__

TurboStreamer::Template.encode FakeContext.new do |json|
  json.object! do
    json.cached do
      json.cache! 'tscached' do
        json.array! 0..100 do |i|
          json.object! do
            json.a i
            json.b i
            json.c i
            json.d i
            json.e i

            json.subitems 0..100 do |j|
              json.object! do
                json.f i.to_s * j
                json.g i.to_s * j
                json.h i.to_s * j
                json.i i.to_s * j
                json.j i.to_s * j
              end
            end
          end
        end
      end
    end
  end
end