RUBY TESTING
Cucumber and RSpec

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

WHY DO WE TEST?

WHAT DO WE TEST?

WHAT DON’T WE TEST?

HOW DO WE TEST?

WHAT DO WE TEST WITH?

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

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

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

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

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

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

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

RINSE AND REPEAT

QUESTIONS?

MORE RESOURCES
cukes.info
rspec.info