Rails dev tools
This is a collection of utilities used for Rails internal development. They aren't used by Rails apps directly.
consoledrops you in irb and loads local Rails repos
Kernel#requireto help reduce startup time
line_statisticsprovides CodeTools module and LineStatistics class to count lines
testis loaded by every major component of Rails to simplify testing, for example:
cd ./actioncable; bin/test ./path/to/actioncable_test_with_line_number.rb:5