move gem

Gemfile

@@ -1,7 +1,6 @@
 source 'https://rubygems.org'
 
-# See https://github.com/rubygems/rubygems/issues/2731 for why we can't declare this the gemspec file
-gem 'trln-chosen-rails', git: 'https://github.com/trln/chosen-rails', branch: 'rails-7'
+
 
 # Declare your gem's dependencies in trln_argon.gemspec.
 # Bundler will treat runtime dependencies like base dependencies, and
@@ -154,3 +153,38 @@ else
   end
 end
 # END ENGINE_CART BLOCK
+# BEGIN ENGINE_CART BLOCK
+# engine_cart: 2.6.0
+# engine_cart stanza: 2.5.0
+# the below comes from engine_cart, a gem used to test this Rails engine gem in the context of a Rails app.
+file = File.expand_path('Gemfile', ENV['ENGINE_CART_DESTINATION'] || ENV['RAILS_ROOT'] || File.expand_path('.internal_test_app', File.dirname(__FILE__)))
+if File.exist?(file)
+  begin
+    eval_gemfile file
+  rescue Bundler::GemfileError => e
+    Bundler.ui.warn '[EngineCart] Skipping Rails application dependencies:'
+    Bundler.ui.warn e.message
+  end
+else
+  Bundler.ui.warn "[EngineCart] Unable to find test application dependencies in #{file}, using placeholder dependencies"
+
+  if ENV['RAILS_VERSION']
+    if ENV['RAILS_VERSION'] == 'edge'
+      gem 'rails', github: 'rails/rails'
+      ENV['ENGINE_CART_RAILS_OPTIONS'] = '--edge --skip-turbolinks'
+    else
+      gem 'rails', ENV['RAILS_VERSION']
+    end
+
+    case ENV['RAILS_VERSION']
+    when /^6.0/
+      gem 'sass-rails', '>= 6'
+      gem 'webpacker', '~> 4.0'
+    when /^5.[12]/
+      gem 'sass-rails', '~> 5.0'
+      gem 'sprockets', '~> 3.7'
+      gem 'thor', '~> 0.20'
+    end
+  end
+end
+# END ENGINE_CART BLOCK

trln_argon.gemspec

@@ -3,6 +3,9 @@ $LOAD_PATH.push File.expand_path('../lib', __FILE__)
 # Maintain your gem's version:
 require 'trln_argon/version'
 
+# See https://github.com/rubygems/rubygems/issues/2731 for why we can't declare this the specification below
+gem 'trln-chosen-rails', git: 'https://github.com/trln/chosen-rails', branch: 'rails-7'
+
 # Describe your gem and declare its dependencies:
 Gem::Specification.new do |s|
   s.name        = 'trln_argon'