Fix CI failures: Update to Shakapacker 8.2.0 and improve test stubbing

- Updated gemspec to require shakapacker ~> 8.2 for async script loading support
- Updated CI convert script to use Shakapacker 8.2.0 instead of 8.0.0
- Fixed file manager test by adding comprehensive File.exist? stubbing
- This addresses the warnings about async script loading compatibility

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

Gemfile.lock

@@ -7,7 +7,7 @@ PATH
       execjs (~> 2.5)
       rails (>= 5.2)
       rainbow (~> 3.0)
-      shakapacker (~> 8.0)
+      shakapacker (~> 8.2)
 
 GEM
   remote: https://rubygems.org/

react_on_rails.gemspec

@@ -31,7 +31,7 @@ Gem::Specification.new do |s|
   s.add_dependency "execjs", "~> 2.5"
   s.add_dependency "rails", ">= 5.2"
   s.add_dependency "rainbow", "~> 3.0"
-  s.add_dependency "shakapacker", "~> 8.0"
+  s.add_dependency "shakapacker", "~> 8.2"
 
   s.add_development_dependency "gem-release"
   s.post_install_message = '

script/convert

@@ -17,9 +17,9 @@ end
 # Keep shakapacker.yml since we're using Shakapacker 8+
 # move("../spec/dummy/config/shakapacker.yml", "../spec/dummy/config/webpacker.yml")
 
-# Shakapacker - use minimum supported version (8.0)
-gsub_file_content("../Gemfile.development_dependencies", /gem "shakapacker", "[^"]*"/, 'gem "shakapacker", "8.0.0"')
-gsub_file_content("../spec/dummy/package.json", /"shakapacker": "[^"]*",/, '"shakapacker": "8.0.0",')
+# Shakapacker - use version with async script loading support (8.2.0+)
+gsub_file_content("../Gemfile.development_dependencies", /gem "shakapacker", "[^"]*"/, 'gem "shakapacker", "8.2.0"')
+gsub_file_content("../spec/dummy/package.json", /"shakapacker": "[^"]*",/, '"shakapacker": "8.2.0",')
 
 # The below packages don't work on the oldest supported Node version and aren't needed there anyway
 gsub_file_content("../package.json", /"[^"]*eslint[^"]*": "[^"]*",?/, "")

spec/react_on_rails/dev/file_manager_spec.rb

@@ -28,6 +28,7 @@
       end
 
       it "removes stale overmind socket files" do
+        allow(File).to receive(:exist?).and_return(false)  # Default to false for any other files
         allow(File).to receive(:exist?).with(".overmind.sock").and_return(true)
         allow(File).to receive(:exist?).with("tmp/sockets/overmind.sock").and_return(false)
         allow(File).to receive(:exist?).with("tmp/pids/server.pid").and_return(false)