SD Ruby BDD Talk

Behavior Driven DevelopmentSDXP/SDRuby
10,000 Foot Overview

Presentation Notes
Don’t bother to pound this into your laptops
The whole thing is on:
http://calicowebdev.com/tblog
There are some of my older blog posts about rSpec on:
http://calicowebdev.com/blog

Who The Hell Am I?
I’d be asking the same question
Since 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, Sass
OSS for last 10 years. Ruby/Rails since 2005
Still trying to get it right … or better

Not Me… But when I’m not programming, this would be a good place to be, right?

Yikes!
I have way more to talk about than I have time to talk.
Big surprise.

Behavior Driven Development
BDD 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.

Let’s See Some Side By Side
Be patient. We’ll get to the real code.

Tools I Use
Ruby
rSpec / rspec-rails
Cucumber
Faker
Fixjour
Again, all this stuff is on:http://calicowebdev.com/tblog

Behavior vs. Test-Driven Development
TDD Way
def test_foo_is_seven
assert_equal(7, @foo)
end
BDD Way
describe @foo do
it "should be seven" do
@foo.should == 7
end
end

TDD vs BDD (Gratuitous Picture)
TDD: assert(true, @surfers.last.hit?)
BDD: @surfers.last.shouldbe_hit

The Premise:
Readability of specs is better than “tests”
Writability of specs is more natural
It’s more likely that you will spec first

The Flow
My personal work habits
Bounce around between Cucumber and rSpec
Create failing Scenario/Spec, then code to fix
Build coverage and edge case handling as I can
Try not to be too obsessive :)

Cucumber: In One Sentence
Story-based description of behaviors
Divides specification into Feature > Scenario
Tests from way outside, ignoring internals
Not as focused as unit/functional tests
Easier to miss edge cases
Slower
Killer for covering full stacks like Rails

I Lied. Another Sentence
Feature: 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
And The accelerator is also depressed
Then I should stop
Scenario: Stopping when the accelerator is stuck
And The accelerator is stuck
Then I should stop

The Obligatory Rails Blog
Developing from the outside in
First do a bit of plumbing
Next write features
Code to make them pass
Drill down to specs where necessary
Eventually, you want good coverage both at acceptance (Cuke) and spec level

SD Ruby BDD Talk

by Steve Ross

Accessibility

Categories

Upload Details

Usage Rights

Statistics

SD Ruby BDD Talk Presentation Transcript