Testing and BDD using RSpec and Cucumber

1. Athens Ruby 16/3/2012
meetup #8
Testing and BDD with
RSpec and Cucumber
Theodoros Orfanidis
(aka @teoulas)

2. About me
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Web developer
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Ruby lover
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Cat lover �
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Tech lead at incrediblue.com
Athens ruby meetup #8 16/3/2012

3. BDD concepts
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Describe what your system does
(Given, When, Then)
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Write features/specs first, code later
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Red-Green-Refactor cycle (just like TDD)
Athens ruby meetup #8 16/3/2012

4. BDD cycle
1
2
4 3
RSpec
6 5
Cucumber
Athens ruby meetup #8 16/3/2012

5. Cucumber
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Higher level
●
Closer to natural language
(any language, even LOLspeak!)
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Tests application behavior
Athens ruby meetup #8 16/3/2012

6. Cucumber – Features
Feature: LOLcat competition submission
In order to win the competition
As a cat owner
I want to submit a cat picture
Scenario: Cat owner submits picture
Given I have a cat
And I have a funny picture of her
When I upload the picture
Then I should see “KTHX! Bai!”
Scenario: Cat owner submits a second picture
Given I have already uploaded a picture
When I upload another picture
Then I should see “Oh noes, naughty boi!”
And I should see my previous submission
Athens ruby meetup #8 16/3/2012

7. Cucumber – Step definitions
Given /^I have uploaded a picture$/ do
@first = Submission.new(title: “My 1337 cat!”,
image: File.open Rails.root + “tmp/sample1.jpg”)
end
When /^I upload another picture$/ do
@another = Submission.new(title: “My cat again”,
image: File.open Rails.root + “tmp/sample2.jpg”)
end
Then /^I should see “([^”]*)”$/ do |msg|
page.should have_content(msg)
end
Athens ruby meetup #8 16/3/2012

8. RSpec
●
Lower level
●
Closer to code
●
Tests object behaviour
Athens ruby meetup #8 16/3/2012

9. RSpec
describe “submission” do
it “should allow jpg images” do
sub = Submission.new(title: “Cat”,
image: File.open Rails.root + “tmp/sample.jpg”)
sub.should be_valid
end
it “should not allow gif images” do
sub = Submission.new(title: “Cat”,
image: File.open Rails.root + “tmp/animated.gif”)
sub.should_not be_valid
end
end
Athens ruby meetup #8 16/3/2012

10. Demo app
Athens ruby meetup #8 16/3/2012

11. Related libraries and tools
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FactoryGirl
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Capybara
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Selenium
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Guard
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Spork
Athens ruby meetup #8 16/3/2012

12. Thanks!
Athens ruby meetup #8 16/3/2012