Merge pull request #29029 from timolehto/master

rake -T should load development env by default, not test

railties/lib/rails/test_unit/railtie.rb

 require "rails/test_unit/line_filtering"
 
 if defined?(Rake.application) && Rake.application.top_level_tasks.grep(/^(default$|test(:|$))/).any?
-  ENV["RAILS_ENV"] ||= "test"
+  ENV["RAILS_ENV"] ||= Rake.application.options.show_tasks ? "development" : "test"
 end
 
 module Rails