SE2016 iOS Alexander Voronov "Test driven development in real world"

@aleks_voronov
TDD in Real World
ALEXANDER VORONOV
@aleks_voronov

@aleks_voronov
WHAT IS NATURAL?

@aleks_voronov
SURVIVAL OF THE FITTEST

@aleks_voronov
OH YOU THINK IT'S FASTER?

@aleks_voronov
OH YOU THINK
IT'S FASTER?

@aleks_voronov
LESSONS LEARNED

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– Heraclitus
“Everything flows”

@aleks_voronov
AUTOMATED TESTING

@aleks_voronov
UNIT TESTS
INTEGRATION TESTS
ACCEPTANCE TESTS
MANUAL

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SELF-TESTING CODE

@aleks_voronov
TEST DRIVEN
DEVELOPMENT

@aleks_voronov
TDD AS A PRACTICE
DEVELOPMENT PRACTICE

@aleks_voronov
TESTS FIRST
RED ‣ GREEN ‣ REFACTOR

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THINK FIRST
THINK ‣ RED ‣ GREEN ‣ REFACTOR

@aleks_voronov
SOUNDS LIKE
WE ACHIEVE
SAME WITH
UNIT TESTS...

@aleks_voronov
UNIT TESTING VS TDD

@aleks_voronov
ONLY NECESSARY CODE
BEST CODE IS NO CODE

@aleks_voronov
RED STAGE SCHOOL
TRUE TEST ALWAYS
REMEMBERS
WHERE IT COMES FROM

@aleks_voronov
CLEANER INTERFACES

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CLEANER INTERFACES
‣ TESTS ARE FIRST TO USE CODE

@aleks_voronov
CLEANER INTERFACES
‣ PLAY IN PURE SANDBOX ENVIRONMENT

@aleks_voronov
CLEANER INTERFACES
‣ UNBIASED DESIGNING

@aleks_voronov
CLEANER INTERFACES
‣ UNBIASED DESIGNING
‣ POORLY DESIGNED CODE WITH TESTS IS STILL BETTER THAN 
POORLY DESIGNED CODE WITHOUT TESTS

@aleks_voronov
QUESTIONS ARISE

@aleks_voronov
WHAT IF I NEED
CODE FIRST?

@aleks_voronov
SPIKE SOLUTION
‣ ISOLATE

@aleks_voronov
SPIKE SOLUTION
‣ ISOLATE
‣ SHORTEN FEEDBACK LOOP: REPL, PLAYGROUND, FIDDLE

@aleks_voronov
SPIKE SOLUTION
‣ ISOLATE
‣ SHORTEN FEEDBACK LOOP: REPL, PLAYGROUND, FIDDLE
‣ SETUP SANDBOX: LIBRARIES, STUBBED RESPONSES

@aleks_voronov
REFACTORING WITH TDD

@aleks_voronov
REFACTORING IS
ABOUT CODE
NOT LOGIC

@aleks_voronov
CHANGING INTERFACE

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I ❤ PROTOCOLS

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STRIVE FOR CONFIDENCE

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CHANGING IMPLEMENTATION

@aleks_voronov
TEST DOUBLES
‣ DUMMIES

@aleks_voronov
TEST DOUBLES
‣ DUMMIES
‣ FAKES

@aleks_voronov
TEST DOUBLES
‣ DUMMIES
‣ FAKES
‣ STUBS

@aleks_voronov
TEST DOUBLES
‣ DUMMIES
‣ FAKES
‣ STUBS
‣ SPIES

@aleks_voronov
TEST DOUBLES
‣ DUMMIES
‣ FAKES
‣ STUBS
‣ SPIES
‣ MOCKS

@aleks_voronov
TESTING STYLES
CLASSICAL & MOCKIST

@aleks_voronov
CLASSICAL TESTING

@aleks_voronov
CLASSICAL TESTING
‣ ABOUT STATE

@aleks_voronov
CLASSICAL TESTING
‣ ABOUT STATE
‣ CAN BREAK ENCAPSULATION

@aleks_voronov
CLASSICAL TESTING
‣ ABOUT STATE
‣ CAN BREAK ENCAPSULATION
‣ USE STUBS

@aleks_voronov
MOCKIST TESTING

@aleks_voronov
MOCKIST TESTING
‣ ABOUT BEHAVIOUR

@aleks_voronov
MOCKIST TESTING
‣ ABOUT BEHAVIOUR
‣ TELL, DON'T ASK

@aleks_voronov
MOCKIST TESTING
‣ ABOUT BEHAVIOUR
‣ TELL, DON'T ASK
‣ USE MOCKS

@aleks_voronov
DETECT BAD SMELL EARLY
#

@aleks_voronov
TDD FOR BETTER DESIGN

@aleks_voronov
TESTS ARE FIRST
WHO LEAVE FEEDBACK
$ %

@aleks_voronov
TESTS HELP YOU EVOLVE

@aleks_voronov
FUNCTIONAL CORE
IMPERATIVE SHELL

@aleks_voronov
INTRODUCING TDD
TO YOUR TEAM

@aleks_voronov
INTRODUCING TDD
TO YOUR TEAM
‣ JUST START WRITING TESTS

@aleks_voronov
INTRODUCING TDD
TO YOUR TEAM
‣ TEST SIMPLEST THINGS

@aleks_voronov
INTRODUCING TDD
TO YOUR TEAM
‣ GET USED WITH TOOLS

@aleks_voronov
INTRODUCING TDD
TO YOUR TEAM
‣ LET OTHERS SEE WHAT YOU DO

@aleks_voronov
INTRODUCING TDD
TO YOUR TEAM
‣ INTRODUCE BOY SCOUT RULE

@aleks_voronov
INTRODUCING TDD
TO YOUR TEAM
‣ INTRODUCE BOY SCOUT RULE
‣ PAIR PROGRAMMING

@aleks_voronov
HOW TO START
WRITING TESTS?

@aleks_voronov
INTRODUCING TDD
TO LEGACY PROJECT

@aleks_voronov
INTRODUCING TDD
TO LEGACY PROJECT
‣ REMEMBER BOY SCOUT RULE?

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INTRODUCING TDD
TO LEGACY PROJECT
‣ START WITH CRITICAL FEATURES

@aleks_voronov
INTRODUCING TDD
TO LEGACY PROJECT
‣ FIND LOWEST POINT YOU CAN TEST

@aleks_voronov
INTRODUCING TDD
TO LEGACY PROJECT
‣ ADD TESTS, THEN REFACTOR

@aleks_voronov
INTRODUCING TDD
TO LEGACY PROJECT
‣ STEP BY STEP

@aleks_voronov
INTRODUCING TDD
TO LEGACY PROJECT
‣ STEP BY STEP
‣ YES, IT TAKES TIME

@aleks_voronov
CONTINUOUS
INTEGRATION

@aleks_voronov
WALKING SKELETON FIRST

@aleks_voronov
SEPARATE JOB PER CONFIG

@aleks_voronov
PULL REQUESTS
& CODE REVIEW

@aleks_voronov
MAKE IT FUN AND CLEAR

@aleks_voronov
DESKTOP
OR MESSENGER
NOTIFICATIONS

@aleks_voronov
CONTINUOUS
DEPLOYMENT

@aleks_voronov
THANK YOU!
QUESTIONS?

SE2016 iOS Alexander Voronov "Test driven development in real world"

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SE2016 iOS Alexander Voronov "Test driven development in real world"