Testing

Test Driven Development
• Implementation
• Red-Green-Refactor
• Regression Tests

Implementation
• Test what should happen
• Test what should not happen

Red-Green-Refactor
Add a test
Run all tests
Write some code
Run the tests again
Refactor code

Regression Tests
Change environment
Change code
Is everything still working

Testing in php
$this->get(\"http://myserver/login.php\");
$this->assertWantedPattern(\"Please login to continue\");
$this->setField(\"username\", \"MyTestUser\");
$this->setField(\"password\", \"t0ps3cr3t\");
$this->clickSubmit(\"Login\");
$this->assertWantedPattern(\"You are logged in\");

Testing in Java
beginAt(\"login.jsp\");
assertTextInElement(\"h1\", \"Please login to continue\");
setFormElement(\"username\", \"MyTestUser\");
setFormElement(\"password\", \"t0ps3cr3t\");
submit();
assertTextInElement(\"h1\", \"You are logged in\");

Testing in Rails
visit login_path
assert_contain \"Please login to continue\"
fill_in \"username\", :with => \"MyTestUser\"
fill_in \"password\", :with => \"t0ps3cr3t\"
click_button \"Login\"
assert_contain \"You are logged in\"

Test Types
• Unit
• Functional
• Integration

Unit
• Most basic level of testing
• Model tests in Rails

Unit Testing
class ShipTest
class Ship
def test_crew
attr_accessor :captain
ship = Ship.new
attr_accessor :maties
ship.captain = 1
ship.mateys = 20
def crew
captain + maties
assert_equal 21, ship.crew
end
end
end
end

Functional
• Test lifecycle of objects
• Controller tests in Rails

Functional Testing
class ShipsController
def enter_other_ship
@ship = Ship.find_captain(params[:captain])
@ship.gold += 1000
@ship.save
redirect_to :action => 'show_loot'
end
end class ShipsControllerTest
def test_entering_other_ship
post 'enter_other_ship', :captain => \"Sparrow\"
assert_response :redirect
assert_equal \"Black Pearl\", assign(:ship).name
assert_equal 1000, assigns(:ship).gold
end
end

Integration
• Overall application functionalities
• Walk through a series of events
• View Tests / Stories

Integration Testing
def test_attacking_other_ships
Given \"another ship\" do |ship|
@ship_to_enter = Ship.find(ship)
end
Given \"my ship\" do
Story: Attacking other ships @my_ship = Ship.find_by_captain(\"Sparrow\")
As Captain Sparrow end
I attack another ship
So I can buy more rum Given /my $number_of_mateys maties/ do |number_of_mateys|
@ship_to_enter.attackers = number_of_mateys
end
Scenario: Attack first ship
Given another ship When \"we attach the other ship\" do
And my ship @my_ship.attacks(@ship_to_enter)
And my 20 mateys end
When we attack the other ship
Then 1 pirate dies Then /$pirates_lost pirate dies/ do |pirates_lost|
assert_equal @my_schip.crew - pirates_lost, @ship_to_enter.attackers
And we steel 1000 pieces of gold
end
Then /we steel $pieces_of_gold pieces of gold/ do |pieces_of_gold|
assert_equal pieces_of_gold, @my_ship.gold
end
end

Integration Testing
Story: Attacking other ships
As Captain Sparrow
I attack another ship
So I can buy more rum
Scenario: Attack first ship
Given another ship
And my ship
And my 20 mateys
When we attack the other ship
Then 1 pirate dies
And we steel 1000 pieces of gold

def test_attacking_other_ships
Given \"another ship\" do |ship|
@ship_to_enter = Ship.find(ship)
end
Given \"my ship\" do
@my_ship = Ship.find_by_captain(\"Sparrow\")
end
Given /my $number_of_mateys maties/ do |number_of_mateys|
@ship_to_enter.attackers = number_of_mateys
end
When \"we attach the other ship\" do
@my_ship.attacks(@ship_to_enter)
end
Then /$pirates_lost pirate dies/ do |pirates_lost|
assert_equal @my_schip.crew - pirates_lost, @ship_to_enter.attackers
end
Then /we steel $pieces_of_gold pieces of gold/ do |pieces_of_gold|
assert_equal pieces_of_gold, @my_ship.gold
end
end

Test Data
• Mock/stub
• Fixtures
• Factories

Mocking & Stubbing
def test_getting_tweet_on_homepage
response = mock
response.stubs(:authorization).returns(true)
response.stubs(:last_tweet).resturns(\"#arrrrcamp rocks\")
TwitterAPI.expects(:get_last_tweet).returns(response)
get 'index'
assert_equal \"#arrrrcamp rocks\", assigns(:tweet).body
end
- Mocha
- Rspec
- Flex Mock

Fixtures
pirates.yml ships.yml
captain_jack_sparrow: black_pearl:
name: Jack Sparrow name: The Black Pearl
enemy: Royal Navy max_crew: 85
captain: captain_jack_sparrow
interceptor:
name: The Interceptor
max_crew: 150
captain: captain_jack_sparrow

Factories
Factory.sequence :pirate do |n|
\"matey#{n}\"
end
Factory.define :ship do |f| should \"only find big ships\" do
f.name 'Pirateship' Factory(:ship, :max_crew => 500)
f.max_crew 100 Factory(:ship, :max_crew => 200)
f.captain { Factory.next(:pirate) }
end ships = Ship.big_ones
assert_equal 1, ships.size
end
- Factory Girl
- Machinist
- Object Daddy
- Foundry
- Fixjour

Questions