TDD in Real World

@aleks_voronov TDD in Real World ALEXANDER VORONOV @aleks_voronov

@aleks_voronov OUR GOAL

@aleks_voronov SURVIVAL OF THE FITTEST

@aleks_voronov MANUAL TESTING

@aleks_voronov OH YOU THINK IT'S FASTER?

@aleks_voronov LESSONS LEARNED

@aleks_voronov – Heraclitus “Everything flows”

@aleks_voronov SUCCESS!

@aleks_voronov OR IS IT?

@aleks_voronov FEEDBACK LOOP

@aleks_voronov AUTOMATED TESTING

@aleks_voronov UNIT TESTS INTEGRATION TESTS ACCEPTANCE TESTS MANUAL

@aleks_voronov SELF-TESTING CODE

@aleks_voronov TEST DRIVEN DEVELOPMENT

@aleks_voronov TDD AS A PRACTICE DEVELOPMENT PRACTICE

@aleks_voronov TESTS FIRST RED ‣ GREEN ‣ REFACTOR

@aleks_voronov THINK FIRST THINK ‣ RED ‣ GREEN ‣ REFACTOR

@aleks_voronov PROFIT✨

@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

@aleks_voronov CLEANER INTERFACES ‣ TESTS ARE FIRST TO USE CODE

‣ PLAY IN PURE SANDBOX ENVIRONMENT

‣ PLAY IN PURE SANDBOX ENVIRONMENT ‣ UNBIASED DESIGNING

‣ PLAY IN PURE SANDBOX ENVIRONMENT ‣ 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

@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

@aleks_voronov I ❤ PROTOCOLS

@aleks_voronov STRIVE FOR CONFIDENCE

@aleks_voronov CHANGING IMPLEMENTATION

@aleks_voronov DEPENDENCIES

@aleks_voronov TEST DOUBLES

@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

TESTS ‣ TEST SIMPLEST THINGS

TESTS ‣ TEST SIMPLEST THINGS ‣ GET USED WITH TOOLS

TESTS ‣ TEST SIMPLEST THINGS ‣ GET USED WITH TOOLS ‣ LET OTHERS SEE WHAT YOU DO

TESTS ‣ TEST SIMPLEST THINGS ‣ GET USED WITH TOOLS ‣ LET OTHERS SEE WHAT YOU DO ‣ INTRODUCE BOY SCOUT RULE

TESTS ‣ TEST SIMPLEST THINGS ‣ GET USED WITH TOOLS ‣ LET OTHERS SEE WHAT YOU DO ‣ 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?

RULE? ‣ START WITH CRITICAL FEATURES

RULE? ‣ START WITH CRITICAL FEATURES ‣ FIND LOWEST POINT YOU CAN TEST

RULE? ‣ START WITH CRITICAL FEATURES ‣ FIND LOWEST POINT YOU CAN TEST ‣ ADD TESTS, THEN REFACTOR

RULE? ‣ START WITH CRITICAL FEATURES ‣ FIND LOWEST POINT YOU CAN TEST ‣ ADD TESTS, THEN REFACTOR ‣ STEP BY STEP

RULE? ‣ START WITH CRITICAL FEATURES ‣ FIND LOWEST POINT YOU CAN TEST ‣ ADD TESTS, THEN REFACTOR ‣ STEP BY STEP ‣ YES, IT TAKES TIME

@aleks_voronov INTEGRATIONS

@aleks_voronov CONTINUOUS INTEGRATION

@aleks_voronov WALKING SKELETON FIRST

@aleks_voronov CI SERVICES

@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 CODE COVERAGE

@aleks_voronov READING LIST

@aleks_voronov THANK YOU! QUESTIONS?

TDD in Real World

TDD in Real World

More Decks by Oleksandr Voronov

Other Decks in Programming

Featured

Transcript