This is why I love cache...

This is why I love cache...

HTML5 Puzzle Chrome Experiment

HTML5 Puzzle Chrome Experiment

http://www.chromeexperiments.com/detail/html5-puzzle/

HTML5 Puzzle

Conventional Debugging vs. TDD

Conventional Debugging vs. TDD

Conventional 

• Write 10s of lines, run, hit bug: break out debugger
• Insert printfʼs to print variables while running repeatedly
• Stop in debugger, tweak/set variables to control code path
• Dammit, I thought for sure I fixed it, now have to do this all again

TDD

• Write a few lines, with test first; know immediately if broken
• Test short pieces of code using expectations
• Use mocks and stubs to control code path
• Re-run test automatically

Testing Software

Testing Software

Before

• Developers finish code, some ad-hoc testing 
• “toss over the wall to Quality Assurance [QA]”
• QA people manually poke at software
  

Today

• Testing is part of every Agile iteration
• Developers responsible for testing own code
• Testing tools & processes highly automated; 
• QA/testing group improves testability & tools

Software quality is the result of a god process, rather than the responsibility of one specific group.