Open a file and it closes automatically

File.open("testfile", "r") do |file|
# ... process the file
end

RSpec book

Test Behaviour Not Internal Structure

Unit Tests can be brittle in that they use internals of an object (eg. check register() method works by checking something was added to an internal array). If we change internals, test will fail even though behaviour hasn't changed. How can we avoid tying our unit tests to internals?

Design the API by using it

When writing code, call methods you wish you had - then you can implement them. Better than designing the API on its own.

Supervising Controller

http://www.martinfowler.com/eaaDev/SupervisingPresenter.html

Pull complex view logic out into the controller to make it testable. In the examples, the controller listens to widget events, and does stuff with the input. Controller will update model, however can leave it up to the view to update model for basic stuff (which it might do using data binding).

TCP Tunnel Gui

http://jcbserver.uwaterloo.ca/cs436/software/tgui/tcpTunnelGUI.shtml

java -jar tunnel.jar 9999 jcbServer.uwaterloo.ca 80