Download - Pragmatic Test Driven Development
PragmaticTest Driven Development
Sunday, January 22, 12
Your Host
ClaytonLengel-Zigich
Certified Scrum MasterCertified Scrum Product OwnerCertified Scrum Professional
@claytonlz
Sunday, January 22, 12
Types of Testing
Sunday, January 22, 12
Types of Testing
Acceptance
Integration
Unit
Sunday, January 22, 12
Types of Testing
POÄNG
This piece should be 24”
These third-party rubber feetshould fit
Given all of these pieces,I can sit in the chair
Sunday, January 22, 12
Types of Testing
Acceptance
Unit Unit UnitUnit Unit Unit
Acceptance
Sunday, January 22, 12
Types of TestingFeature
Unit Unit Unit
Acceptance
Feature
Unit Unit Unit
Acceptance
Feature
Unit Unit Unit
Acceptance
Feature
Unit Unit Unit
Acceptance
Feature
Unit Unit Unit
Acceptance
Feature
Unit Unit Unit
Acceptance
Sunday, January 22, 12
Who’s Responsible?
Sunday, January 22, 12
Who’s Responsible?
QA
QA QA QA QA QA QA QA
QA QA QA QA QA QA QA
QA QA QA QA QA QA QA
QA QA QA QA QA QA QA
QA QA QA QA QA QA QA
QA QA QA QA QA QA QA
Sunday, January 22, 12
Who’s Responsible?
QA
Sunday, January 22, 12
Who Writes Unit Tests?
Sunday, January 22, 12
Who Writes Acceptance Tests?
DEV
CUSTOMER
QA
Discovery
Sunday, January 22, 12
Automated Testing
Sunday, January 22, 12
Continuous Integration
Continuous integration avoids or detects compatibility problems early ... if you integrate throughout the project in small amounts you will not find your self trying to integrate the system for weeks at the project's end while the deadline slips by.
Always work in the context of the latest version of the system.
Sunday, January 22, 12
Continuous Integration
BuildServer
SCM
SCM
Sunday, January 22, 12
Continuous Integration
BuildServer
Compilation
Executes Tests
Defines Status
Sunday, January 22, 12
Continuous Integration
10MINUTE BUILD
Sunday, January 22, 12
Test First Programming
Sunday, January 22, 12
Test First Programming
Sunday, January 22, 12
Test Driven Development
Sunday, January 22, 12
Test Driven Development
Test
Code
Test
Sunday, January 22, 12
Test Driven Development
Failing
Passing
Refactored
Sunday, January 22, 12
Test Driven Development
Failing Acceptance Test
Failing Unit Test
Passing Unit Test
Refactor
Sunday, January 22, 12
Test Driven Development
Code Code Code Code Test Code Code
Time
CodeTest
Time
CodeTest CodeTest Test
Sunday, January 22, 12
Frameworks and Tools
Sunday, January 22, 12
Frameworks And Tools
xUnitSunday, January 22, 12
Frameworks And Tools
xUnit Language
JUnit Java
NUnit .Net
TestUnit Ruby
QUnit JavaScript
PhpUnit PHP
Sunday, January 22, 12
Pair Programming
Sunday, January 22, 12
Pair Programming
Write Test Write Code
Sunday, January 22, 12
Tutorial #1
Sunday, January 22, 12
Test Unit Fundamentals
test_strike_strike_ball_ball_ball
test_full_count
vs
Sunday, January 22, 12
Test Unit Fundamentals
Setup
Assertion
Assertion
Assertion
Tear Down
Sunday, January 22, 12
Test Unit Fundamentalsassert(test, msg = (nomsg = true; nil))
assert_equal(exp, act, msg = nil)
assert_no_match(regexp, string, msg=nil)
assert_not_equal(exp, act, msg=nil)
assert_not_nil(exp, msg=nil)
assert_not_same(expected, actual, message="")
assert_nothing_raised(*args)
assert_nothing_thrown(msg=nil)
assert_raise(*args, &b)
assert_respond_to(obj, meth, msg = nil)
Sunday, January 22, 12
TDD RUles
1.Only write code that makes a test pass
2.Only write enough of a test to make it fail
3.Only write enough code to make a test pass
Sunday, January 22, 12
Tutorial #1
In pairs, write a program that can play the game of hangman.
50mActivity Time
Sunday, January 22, 12
Mocking & STUBBING
Mocks vs. Stubs
Indirect Outputs vs. Indirect Inputs
Objects vs. Methods
Behavior vs. State
Sunday, January 22, 12
Mocking
Order
Warehouse
?
?
?
Warehouse
Sunday, January 22, 12
Mocking
Order
Warehouse
WarehouseItem
order.items.each do |item| warehouse_item = Warehouse.find(item) warehouse_item.stock_reservation.reserveend
StockReservation
Sunday, January 22, 12
Mocking
Order
Warehouse
Warehouse.reserve(items)
Sunday, January 22, 12
Mocking
fake_warehouse = mock(Warehouse)
assert( fake_warehouse.received("reserve") .with(items), "Expected the warehouse to check its stock")
Sunday, January 22, 12
STUBBING
CUSTOMER
“If any items are out-of-stock, the system should prevent the
order from completing”
Sunday, January 22, 12
STUBBING
def test_out_of_stock order = Order.new item1 = Item.new(:sku => "abc") item2 = Item.new(:sku => "def") order.items = [item1, item2] stock_item1 = StockItem.new(:sku => 'zyx') ...end
Sunday, January 22, 12
STUBBING
def test_invalid_items Warehouse.stub(:reserve) .and_raise(OutOfStockException) assert_raise(OutOfStockException) do order.complete endend
Sunday, January 22, 12
Tutorial #2
Sunday, January 22, 12
Tutorial #2
In pairs, write a program that implements Conway’s game of life.
45mActivity Time
Sunday, January 22, 12
Game of Life
“The universe of the Game of Life is an infinite two-dimensional orthogonal grid of square cells, each of which is in one of two possible states, alive or dead. Every cell interacts with its eight neighbors, which are the cells that are horizontally, vertically, or diagonally adjacent. At each step in time, the following transitions occur:”
Sunday, January 22, 12
Game of Life: Rules
1 Any live cell with fewer than two live neighbors dies, as if caused by under-population.
2 Any live cell with two or three live neighbors lives on to the next generation.
3 Any live cell with more than three live neighbors dies, as if by overcrowding.
Any dead cell with exactly three live neighbors becomes a live cell, as if by reproduction.4
Sunday, January 22, 12
Closing
Sunday, January 22, 12
Test Feedback
Listen to your tests
Sunday, January 22, 12
Code Coverage
DEV
MANAGEMENT
“If we’re not at 90% code coverage you’re all working
on Saturday.”
“assert(true)”
Sunday, January 22, 12
Continuously Integrate
Live and Die by the build
Sunday, January 22, 12
Plan to Succeed
Write tests before you plan the implementation
BDD
Failing Unit Test
Passing Unit Test
Refactor
TDD
Sunday, January 22, 12
