The document discusses testing in Ruby using Cucumber and RSpec, focusing on behavior-driven development (BDD) tools. It explains the process of writing features, defining steps, and creating specs, illustrated with a calculator example. Additionally, it provides links to resources for further information on Cucumber and RSpec.

1. RUBY TESTING
Cucumber and RSpec

2. WHO IS THIS GUY?
James Thompson
@plainprogrammer
james@plainprograms.com
Web Administrator & Student
@ New Orleans Baptist
Theological Seminary

3. WHY DO WE TEST?

4. WHAT DO WE TEST?

5. WHAT DON’T WE TEST?

6. HOW DO WE TEST?

7. WHAT DO WE TEST WITH?

8. WHAT IS CUCUMBER
•Behavior driven development tool for Ruby
•Focuses on higher level implementations such as
acceptance tests
•Focuses on story-style, plain English test descriptions
•Follows the GWT (Given, When, Then) pattern for
features

9. WHAT IS RSPEC
•Behavior driven development tool for Ruby
•Provides a DSL for talking about what code should do

10. A POSSIBLE PROCESS
•Start with a feature
•Define the steps for your feature
•Write lower-level specs
•Write code to pass specs
•Rinse and Repeat until feature passes

11. WRITE A FEATURE
# features/calculator.feature
Feature: Addition
In Order to avoid silly mistakes
As a math idiot
I want to be told the sum of two numbers
Scenario: Add two numbers
Given I have entered 50 into the calculator
And I have entered 70 into the calculator
When I press add
Then the result should be 120 on the screen

12. WRITE STEPS
# features/step_definitions/calculator_steps.rb
Given /I have entered (.*) into the calculator/ do |n|
calculator = Calculator.new
calculator.push(n.to_i)
end

13. WRITE SPECS
# spec/calculator.spec
describe Calculator do
before(:each) do
@calculator = Calculator.new
end
it "should respond to push()" do
@calculator.should respond_to(:push)
end
it "should respond to add()" do
@calculator.should respond_to(:add)
end
end

14. CODE UNTIL YOU PASS
class Calculator
def push(n)
@args ||= []
@args << n
end
def add
result = 0
@args.each do |n|
result += n
end
result
end
end

15. RINSE AND REPEAT

16. QUESTIONS?

17. MORE RESOURCES
cukes.info
rspec.info