Sustainable testing

Not disagreeing with the sentiment but is this paragraph correct? Doesn't rails actually glob directories on the autoload path (config.autoload_paths) and call `Kernel` `autoload` method http://www.ruby-doc.org/core-2.1.2/Kernel.html#method-i-autoload ?
*"Registers filename to be loaded (using Kernel::require) the first time that module (which may be a String or a symbol) is accessed."* ?

Or maybe this has changed over the years as rails has "matured" ;-)

Bundler.require is a different matter, unlike Bundler.setup which sets-up autoload paths http://bundler.io/v1.2/bundler_setup.html