AP tests: detect missing dependencies and automatically run bundler

actionpack/test/abstract_unit.rb

@@ -6,8 +6,8 @@ $:.unshift(File.dirname(__FILE__) + '/lib')
 $:.unshift(File.dirname(__FILE__) + '/fixtures/helpers')
 $:.unshift(File.dirname(__FILE__) + '/fixtures/alternate_helpers')
 
-bundler = File.join(File.dirname(__FILE__), '..', 'vendor', 'gems', 'environment')
-require bundler if File.exist?("#{bundler}.rb")
+require 'bundler_helper'
+ensure_requirable %w( rack rack/test sqlite3 builder memcache tzinfo )
 
 ENV['TMPDIR'] = File.join(File.dirname(__FILE__), 'tmp')
 

actionpack/test/abstract_unit2.rb

@@ -5,8 +5,8 @@ $:.unshift(File.dirname(__FILE__) + '/../../activesupport/lib')
 $:.unshift(File.dirname(__FILE__) + '/../lib')
 $:.unshift(File.dirname(__FILE__) + '/lib')
 
-bundler = File.join(File.dirname(__FILE__), '..', '..', 'vendor', 'gems', 'environment')
-require bundler if File.exist?("#{bundler}.rb")
+require 'bundler_helper'
+ensure_requirable %w( rack rack/test )
 
 require 'test/unit'
 require 'active_support'

actionpack/test/bundler_helper.rb

@@ -0,0 +1,30 @@
+BUNDLER_ENV_FILE = File.join(File.dirname(__FILE__), '..', 'vendor', 'gems', 'environment')
+
+def load_bundled_gems
+  load_bundled_gems! if File.exist?("#{BUNDLER_ENV_FILE}.rb")
+end
+
+def load_bundled_gems!
+  puts "Checking if the bundled testing requirements are up to date..."
+
+  result = system "gem bundle"
+  unless result
+    puts "The gem bundler is not installed. Installing."
+    system "gem install bundler"
+    system "gem bundle"
+  end
+
+  require BUNDLER_ENV_FILE
+end
+
+def ensure_requirable(libs)
+  load_bundled_gems
+
+  begin
+    libs.each { |lib| require lib }
+  rescue LoadError => e
+    puts "Missing required libs to run test"
+    puts e.message
+    load_bundled_gems!
+  end
+end