@aleks_voronov TDD in Real World ALEXANDER VORONOV @aleks_voronov
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@aleks_voronov
TDD in Real WorldALEXANDER VORONOV
@aleks_voronov
@aleks_voronov
WHAT IS NATURAL?
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SURVIVAL OF THE FITTEST
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MANUAL TESTING
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OH YOU THINK IT'S FASTER?
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OH YOU THINK IT'S FASTER?
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LESSONS LEARNED
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– Heraclitus
“Everything flows”
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SUCCESS!
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OR IS IT?
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FEEDBACK LOOP
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AUTOMATED TESTING
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UNIT TESTS
INTEGRATION TESTS
ACCEPTANCE TESTS
MANUAL
@aleks_voronov
UNIT TESTS
INTEGRATION TESTS
ACCEPTANCE TESTS
MANUAL
@aleks_voronov
UNIT TESTS
INTEGRATION TESTS
ACCEPTANCE TESTS
MANUAL
@aleks_voronov
UNIT TESTS
INTEGRATION TESTS
ACCEPTANCE TESTS
MANUAL
@aleks_voronov
SELF-TESTING CODE
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TEST DRIVEN DEVELOPMENT
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TDD AS A PRACTICE DEVELOPMENT PRACTICE
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TESTS FIRSTRED ‣ GREEN ‣ REFACTOR
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THINK FIRSTTHINK ‣ RED ‣ GREEN ‣ REFACTOR
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PROFIT✨
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SOUNDS LIKE WE ACHIEVE SAME WITH
UNIT TESTS...
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UNIT TESTING VS TDD
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ONLY NECESSARY CODEBEST CODE IS NO CODE
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RED STAGE SCHOOLTRUE TEST ALWAYS
REMEMBERS WHERE IT COMES FROM
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CLEANER INTERFACES
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CLEANER INTERFACES‣ TESTS ARE FIRST TO USE CODE
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CLEANER INTERFACES‣ TESTS ARE FIRST TO USE CODE
‣ PLAY IN PURE SANDBOX ENVIRONMENT
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CLEANER INTERFACES‣ TESTS ARE FIRST TO USE CODE
‣ PLAY IN PURE SANDBOX ENVIRONMENT‣ UNBIASED DESIGNING
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CLEANER INTERFACES‣ TESTS ARE FIRST TO USE CODE
‣ PLAY IN PURE SANDBOX ENVIRONMENT‣ UNBIASED DESIGNING
‣ POORLY DESIGNED CODE WITH TESTS IS STILL BETTER THANPOORLY DESIGNED CODE WITHOUT TESTS
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QUESTIONS ARISE
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WHAT IF I NEED CODE FIRST?
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SPIKE SOLUTION
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SPIKE SOLUTION‣ ISOLATE
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SPIKE SOLUTION‣ ISOLATE
‣ SHORTEN FEEDBACK LOOP: REPL, PLAYGROUND, FIDDLE
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SPIKE SOLUTION‣ ISOLATE
‣ SHORTEN FEEDBACK LOOP: REPL, PLAYGROUND, FIDDLE
‣ SETUP SANDBOX: LIBRARIES, STUBBED RESPONSES
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REFACTORING WITH TDD
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REFACTORING IS ABOUT CODE NOT LOGIC
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CHANGING INTERFACE
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I ❤ PROTOCOLS
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STRIVE FOR CONFIDENCE
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CHANGING IMPLEMENTATION
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DEPENDENCIES
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TEST DOUBLES
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TEST DOUBLES‣ DUMMIES
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TEST DOUBLES‣ DUMMIES‣ FAKES
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TEST DOUBLES‣ DUMMIES‣ FAKES‣ STUBS
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TEST DOUBLES‣ DUMMIES‣ FAKES‣ STUBS‣ SPIES
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TEST DOUBLES‣ DUMMIES‣ FAKES‣ STUBS‣ SPIES‣ MOCKS
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TESTING STYLESCLASSICAL & MOCKIST
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CLASSICAL TESTING
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CLASSICAL TESTING‣ ABOUT STATE
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CLASSICAL TESTING‣ ABOUT STATE
‣ CAN BREAK ENCAPSULATION
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CLASSICAL TESTING‣ ABOUT STATE
‣ CAN BREAK ENCAPSULATION
‣ USE STUBS
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MOCKIST TESTING
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MOCKIST TESTING‣ ABOUT BEHAVIOUR
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MOCKIST TESTING‣ ABOUT BEHAVIOUR
‣ TELL, DON'T ASK
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MOCKIST TESTING‣ ABOUT BEHAVIOUR
‣ TELL, DON'T ASK
‣ USE MOCKS
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DETECT BAD SMELL EARLY#
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TDD FOR BETTER DESIGN
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TESTS ARE FIRST WHO LEAVE FEEDBACK
$ %
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TESTS HELP YOU EVOLVE
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FUNCTIONAL CORE IMPERATIVE SHELL
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INTRODUCING TDD TO YOUR TEAM
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INTRODUCING TDD TO YOUR TEAM
‣ JUST START WRITING TESTS
@aleks_voronov
INTRODUCING TDD TO YOUR TEAM
‣ JUST START WRITING TESTS
‣ TEST SIMPLEST THINGS
@aleks_voronov
INTRODUCING TDD TO YOUR TEAM
‣ JUST START WRITING TESTS
‣ TEST SIMPLEST THINGS
‣ GET USED WITH TOOLS
@aleks_voronov
INTRODUCING TDD TO YOUR TEAM
‣ JUST START WRITING TESTS
‣ TEST SIMPLEST THINGS
‣ GET USED WITH TOOLS
‣ LET OTHERS SEE WHAT YOU DO
@aleks_voronov
INTRODUCING TDD TO YOUR TEAM
‣ JUST START WRITING TESTS
‣ TEST SIMPLEST THINGS
‣ GET USED WITH TOOLS
‣ LET OTHERS SEE WHAT YOU DO
‣ INTRODUCE BOY SCOUT RULE
@aleks_voronov
INTRODUCING TDD TO YOUR TEAM
‣ JUST START WRITING TESTS
‣ TEST SIMPLEST THINGS
‣ GET USED WITH TOOLS
‣ LET OTHERS SEE WHAT YOU DO
‣ INTRODUCE BOY SCOUT RULE
‣ PAIR PROGRAMMING
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HOW TO START WRITING TESTS?
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INTRODUCING TDD TO LEGACY PROJECT
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INTRODUCING TDD TO LEGACY PROJECT
‣ REMEMBER BOY SCOUT RULE?
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INTRODUCING TDD TO LEGACY PROJECT
‣ REMEMBER BOY SCOUT RULE?
‣ START WITH CRITICAL FEATURES
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INTRODUCING TDD TO LEGACY PROJECT
‣ REMEMBER BOY SCOUT RULE?
‣ START WITH CRITICAL FEATURES
‣ FIND LOWEST POINT YOU CAN TEST
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INTRODUCING TDD TO LEGACY PROJECT
‣ REMEMBER BOY SCOUT RULE?
‣ START WITH CRITICAL FEATURES
‣ FIND LOWEST POINT YOU CAN TEST
‣ ADD TESTS, THEN REFACTOR
@aleks_voronov
INTRODUCING TDD TO LEGACY PROJECT
‣ REMEMBER BOY SCOUT RULE?
‣ START WITH CRITICAL FEATURES
‣ FIND LOWEST POINT YOU CAN TEST
‣ ADD TESTS, THEN REFACTOR
‣ STEP BY STEP
@aleks_voronov
INTRODUCING TDD TO LEGACY PROJECT
‣ REMEMBER BOY SCOUT RULE?
‣ START WITH CRITICAL FEATURES
‣ FIND LOWEST POINT YOU CAN TEST
‣ ADD TESTS, THEN REFACTOR
‣ STEP BY STEP
‣ YES, IT TAKES TIME
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INTEGRATIONS
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CONTINUOUS INTEGRATION
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WALKING SKELETON FIRST
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CI SERVICES
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SEPARATE JOB PER CONFIG
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PULL REQUESTS & CODE REVIEW
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MAKE IT FUN AND CLEAR
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DESKTOP OR MESSENGER NOTIFICATIONS
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MAKE IT FUN AND CLEAR
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CONTINUOUS DEPLOYMENT
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MAKE IT FUN AND CLEAR
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CODE COVERAGE
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THANK YOU!
QUESTIONS?
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