SD Ruby BDD Talk
- 1. Behavior Driven DevelopmentSDXP/SDRuby10,000 Foot Overview
- 2. Presentation NotesDon’t bother to pound this into your laptopsThe whole thing is on:http://calicowebdev.com/tblogThere are some of my older blog posts about rSpec on:http://calicowebdev.com/blog
- 3. Who The Hell Am I?I’d be asking the same questionSince you asked (or not), Steve Ross (@cwd1)Calico Web Development, I build Web apps using primarily Ruby, rSpec, Cucumber and a bunch of other keen Ruby technologies like … um … Rails, Haml, SassOSS for last 10 years. Ruby/Rails since 2005Still trying to get it right … or better
- 4. Not Me… But when I’m not programming, this would be a good place to be, right?
- 5. Yikes!I have way more to talk about than I have time to talk.Big surprise.
- 6. Behavior Driven DevelopmentBDD is a way of expressing a set of expected results – i.e., tests.That is as opposed to TDD (test, blah) where you express what you think happened and check to see that it did.
- 7. Let’s See Some Side By SideBe patient. We’ll get to the real code.
- 8. Tools I UseRubyrSpec / rspec-railsCucumberFakerFixjourAgain, all this stuff is on:http://calicowebdev.com/tblog
- 9. Behavior vs. Test-Driven DevelopmentTDD Way def test_foo_is_seven assert_equal(7, @foo) endBDD Waydescribe @foo do it "should be seven" do @foo.should == 7 end end
- 10. TDD vs BDD (Gratuitous Picture)TDD: assert(true, @surfers.last.hit?)BDD: @surfers.last.shouldbe_hit
- 11. The Premise:Readability of specs is better than “tests”Writability of specs is more naturalIt’s more likely that you will spec first
- 12. The FlowMy personal work habitsBounce around between Cucumber and rSpecCreate failing Scenario/Spec, then code to fixBuild coverage and edge case handling as I canTry not to be too obsessive :)
- 13. Cucumber: In One SentenceStory-based description of behaviorsDivides specification into Feature > ScenarioTests from way outside, ignoring internalsNot as focused as unit/functional testsEasier to miss edge casesSlowerKiller for covering full stacks like Rails
- 14. I Lied. Another SentenceFeature: Stopping a Car In order to stop my car when I need to As a driver I want the brakes always to bring the car to a halt Scenario: Stopping under normal circumstances Given The ignition is on And The car is in motion When I step on the brake Then I should stop Scenario: Stopping when the accelerator is also depressed Given The ignition is on And The accelerator is also depressed When I step on the brake Then I should stop Scenario: Stopping when the accelerator is stuck Given The ignition is on And The accelerator is stuck When I step on the brake Then I should stop
- 15. The Obligatory Rails BlogDeveloping from the outside inFirst do a bit of plumbingNext write featuresCode to make them passDrill down to specs where necessaryEventually, you want good coverage both at acceptance (Cuke) and spec level