WTF TDD?

WTF TDD?Jeremy Weiskotten Terrible Labs

@doctorzaius

The year was 1996...

Srsly.

So what changed?• Open source movement• Agile, Lean, Scrum• Extreme Programming

EXTREME! PROGRAMMING! O/ LOL• Shared ownership• Continuous integration• Sustainable pace• Pair programming• Test-Driven Development (TDD/BDD)

Red GreenRefactor

Refactoring• Improving the design of existing code (without changing its behavior)• Make a small change, run your tests.• Ifit takes more than a day, you’re rewriting, not refactoring.

legacy_code/README• “Legacy code” is code that doesn’t have tests.• It’s always easier to test new code than to bring legacy code under test.

Stay loose.• Loosely coupled objects are easier to test in isolation• Dependency injection, Strategy pattern• “awkward collaborators” (Feathers)

Is TDD worth it?

ZOMG RESEARCH• TDD teams took 15-35% longer• TDD teams created 40-90% fewer bugs “If we control for defect rate, is TDD faster?” http://grokcode.com/439/test-driven-development-and-the-meaning-of-done/

We have the tools.We have the talent. Srsly.

Ruby Testing Frameworks• Test::Unit• RSpec• MiniTest• Shoulda• TestRocket http://codebrawl.com/articles/contest-rundown-ruby-testing-libraries

Integration Testing• watir• webrat• cucumber• steak• capybara• capybara-webkit

Factories because ﬁxtures suck• Factory Girl• Fabrication• Machinist• Sham• Object Daddy

Rails/ActiveRecord• shoulda-matchers• valid_attribute• email-spec

Stubbin’ and Mockin’ and Fakin’• mocha • vcr• FlexMock • timecop• rr • faker, ffaker• fakeweb • bourne• webmock • Mock::Turtle• faraday

Feedback, early & often• spork• autotest• autospec• ZenTest

Standards & Practices• metric_fu • reek• ﬂay • rcov• ﬂog • CoverMe• roodi • SimpleCov• rails_best_practices• saikuro

We’re religious about testing.• We believe.• We argue about the details.• Some more than others!• That’s OK.

“I do not write tests for my code.”

Thanks for still being here!

WTF TDD?

by jeremyw on Sep 13, 2011

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