SlideShare a Scribd company logo

Transformation Priority Premise: TDD Test Order Matters

Mike Clement
Mike Clement
Mike ClementHusband, Father and VP of Engineering at Emmersion, Founder Software Craftsmanship Atlanta

When coding using TDD, do you often run into a point when you have to “implement the whole thing”? The sequence of tests that we write significantly impacts where are code ends up! We’ll explore Uncle Bob’s Transformation Priority Premise, looking at the transformations that code goes through and how our tests can drive the code in different directions.

Transformation Priority Premise: TDD Test Order Matters

1 of 26
Download to read offline
Transformation Priority Premise:
TDD Test Order Matters
Mike Clement
@mdclement
mike@softwareontheside.com
http://blog.softwareontheside.com
http://agilecodegames.com
XP Simple Design
• Passes all tests
• Clear, expressive, consistent
• No duplication
• Minimal
TDD Review
TDD
• Red
• Green
• Refactor
Ways to get Green
• Fake it
• Obvious
implementation
• Triangulation
Transformation Priority Premise: TDD Test Order Matters
Transformation Priority Premise: TDD Test Order Matters
Transformation Priority Premise: TDD Test Order Matters
Ad

Recommended

Software testdesign
Software testdesignSoftware testdesign
Software testdesign柏宇 陳
 
[SRD UGM] Sharing Session - Software Testing
[SRD UGM] Sharing Session - Software Testing[SRD UGM] Sharing Session - Software Testing
[SRD UGM] Sharing Session - Software TestingAhmad Widardi
 
Spec By Example or How to teach people talk to each other
Spec By Example or How to teach people talk to each otherSpec By Example or How to teach people talk to each other
Spec By Example or How to teach people talk to each otherAndrey Rebrov
 
Automated testing of ASP .Net Core applications
Automated testing of ASP .Net Core applications Automated testing of ASP .Net Core applications
Automated testing of ASP .Net Core applications nispas
 
How to improve your unit tests?
How to improve your unit tests?How to improve your unit tests?
How to improve your unit tests?Péter Módos
 
Unit testing
Unit testingUnit testing
Unit testingAdam Birr
 

More Related Content

What's hot

Working Effectively With Legacy Code
Working Effectively With Legacy CodeWorking Effectively With Legacy Code
Working Effectively With Legacy CodeExcella
 
Introduzione allo Unit Testing
Introduzione allo Unit TestingIntroduzione allo Unit Testing
Introduzione allo Unit TestingStefano Ottaviani
 
TDD reloaded - JUGTAA 24 Ottobre 2012
TDD reloaded - JUGTAA 24 Ottobre 2012TDD reloaded - JUGTAA 24 Ottobre 2012
TDD reloaded - JUGTAA 24 Ottobre 2012Pietro Di Bello
 
Unit testing
Unit testingUnit testing
Unit testingBrian Hu
 
How engineering practices help business
How engineering practices help businessHow engineering practices help business
How engineering practices help businessAndrey Rebrov
 
How good are your tests?
How good are your tests?How good are your tests?
How good are your tests?Noam Shaish
 
QA Evening Максим Колотилкин - Test State Pattern
QA Evening Максим Колотилкин - Test State PatternQA Evening Максим Колотилкин - Test State Pattern
QA Evening Максим Колотилкин - Test State PatternArtjoker
 
Testing - Is This Even a Thing?
Testing - Is This Even a Thing?Testing - Is This Even a Thing?
Testing - Is This Even a Thing?Nick George
 
Automated Testing but like for PowerShell (April 2012)
Automated Testing but like for PowerShell (April 2012)Automated Testing but like for PowerShell (April 2012)
Automated Testing but like for PowerShell (April 2012)Rob Reynolds
 
TDD - survival guide
TDD - survival guide TDD - survival guide
TDD - survival guide vitalipe
 
Giving automated tests the love they deserve at Listings
Giving automated tests the love they deserve at ListingsGiving automated tests the love they deserve at Listings
Giving automated tests the love they deserve at ListingsJordi Pradel
 
Swift testing ftw
Swift testing ftwSwift testing ftw
Swift testing ftwJorge Ortiz
 
Principles and patterns for test driven development
Principles and patterns for test driven developmentPrinciples and patterns for test driven development
Principles and patterns for test driven developmentStephen Fuqua
 
Unit Testing Best Practices
Unit Testing Best PracticesUnit Testing Best Practices
Unit Testing Best PracticesTomaš Maconko
 

What's hot (16)

Working Effectively With Legacy Code
Working Effectively With Legacy CodeWorking Effectively With Legacy Code
Working Effectively With Legacy Code
 
Introduzione allo Unit Testing
Introduzione allo Unit TestingIntroduzione allo Unit Testing
Introduzione allo Unit Testing
 
TDD reloaded - JUGTAA 24 Ottobre 2012
TDD reloaded - JUGTAA 24 Ottobre 2012TDD reloaded - JUGTAA 24 Ottobre 2012
TDD reloaded - JUGTAA 24 Ottobre 2012
 
Unit testing
Unit testingUnit testing
Unit testing
 
How engineering practices help business
How engineering practices help businessHow engineering practices help business
How engineering practices help business
 
Refactoring
RefactoringRefactoring
Refactoring
 
How good are your tests?
How good are your tests?How good are your tests?
How good are your tests?
 
QA Evening Максим Колотилкин - Test State Pattern
QA Evening Максим Колотилкин - Test State PatternQA Evening Максим Колотилкин - Test State Pattern
QA Evening Максим Колотилкин - Test State Pattern
 
Testing - Is This Even a Thing?
Testing - Is This Even a Thing?Testing - Is This Even a Thing?
Testing - Is This Even a Thing?
 
Automated Testing but like for PowerShell (April 2012)
Automated Testing but like for PowerShell (April 2012)Automated Testing but like for PowerShell (April 2012)
Automated Testing but like for PowerShell (April 2012)
 
TDD - survival guide
TDD - survival guide TDD - survival guide
TDD - survival guide
 
Giving automated tests the love they deserve at Listings
Giving automated tests the love they deserve at ListingsGiving automated tests the love they deserve at Listings
Giving automated tests the love they deserve at Listings
 
Swift testing ftw
Swift testing ftwSwift testing ftw
Swift testing ftw
 
Principles and patterns for test driven development
Principles and patterns for test driven developmentPrinciples and patterns for test driven development
Principles and patterns for test driven development
 
IntroTestMore
IntroTestMoreIntroTestMore
IntroTestMore
 
Unit Testing Best Practices
Unit Testing Best PracticesUnit Testing Best Practices
Unit Testing Best Practices
 

Viewers also liked

Put the Tests Before the Code
Put the Tests Before the CodePut the Tests Before the Code
Put the Tests Before the CodeMike Clement
 
Using Rhino Mocks for Effective Unit Testing
Using Rhino Mocks for Effective Unit TestingUsing Rhino Mocks for Effective Unit Testing
Using Rhino Mocks for Effective Unit TestingMike Clement
 
Software Craftsmanship and Agile Code Games
Software Craftsmanship and Agile Code GamesSoftware Craftsmanship and Agile Code Games
Software Craftsmanship and Agile Code GamesMike Clement
 
Play to Learn: Agile Games with Cards and Dice
Play to Learn: Agile Games with Cards and DicePlay to Learn: Agile Games with Cards and Dice
Play to Learn: Agile Games with Cards and DiceMike Clement
 
Power of Patterns: Refactoring to (or away from) Patterns
Power of Patterns: Refactoring to (or away from) PatternsPower of Patterns: Refactoring to (or away from) Patterns
Power of Patterns: Refactoring to (or away from) PatternsMike Clement
 
FizzBuzz Guided Kata
FizzBuzz Guided KataFizzBuzz Guided Kata
FizzBuzz Guided KataMike Clement
 
The Quest for Continuous Delivery at Pluralsight
The Quest for Continuous Delivery at PluralsightThe Quest for Continuous Delivery at Pluralsight
The Quest for Continuous Delivery at PluralsightMike Clement
 
Mob Programming for Continuous Learning
Mob Programming for Continuous LearningMob Programming for Continuous Learning
Mob Programming for Continuous LearningMike Clement
 
NATS - A new nervous system for distributed cloud platforms
NATS - A new nervous system for distributed cloud platformsNATS - A new nervous system for distributed cloud platforms
NATS - A new nervous system for distributed cloud platformsDerek Collison
 

Viewers also liked (10)

Thinking in F#
Thinking in F#Thinking in F#
Thinking in F#
 
Put the Tests Before the Code
Put the Tests Before the CodePut the Tests Before the Code
Put the Tests Before the Code
 
Using Rhino Mocks for Effective Unit Testing
Using Rhino Mocks for Effective Unit TestingUsing Rhino Mocks for Effective Unit Testing
Using Rhino Mocks for Effective Unit Testing
 
Software Craftsmanship and Agile Code Games
Software Craftsmanship and Agile Code GamesSoftware Craftsmanship and Agile Code Games
Software Craftsmanship and Agile Code Games
 
Play to Learn: Agile Games with Cards and Dice
Play to Learn: Agile Games with Cards and DicePlay to Learn: Agile Games with Cards and Dice
Play to Learn: Agile Games with Cards and Dice
 
Power of Patterns: Refactoring to (or away from) Patterns
Power of Patterns: Refactoring to (or away from) PatternsPower of Patterns: Refactoring to (or away from) Patterns
Power of Patterns: Refactoring to (or away from) Patterns
 
FizzBuzz Guided Kata
FizzBuzz Guided KataFizzBuzz Guided Kata
FizzBuzz Guided Kata
 
The Quest for Continuous Delivery at Pluralsight
The Quest for Continuous Delivery at PluralsightThe Quest for Continuous Delivery at Pluralsight
The Quest for Continuous Delivery at Pluralsight
 
Mob Programming for Continuous Learning
Mob Programming for Continuous LearningMob Programming for Continuous Learning
Mob Programming for Continuous Learning
 
NATS - A new nervous system for distributed cloud platforms
NATS - A new nervous system for distributed cloud platformsNATS - A new nervous system for distributed cloud platforms
NATS - A new nervous system for distributed cloud platforms
 

Similar to Transformation Priority Premise: TDD Test Order Matters

Transformation Priority Premise @Softwerkskammer MUC
Transformation Priority Premise @Softwerkskammer MUCTransformation Priority Premise @Softwerkskammer MUC
Transformation Priority Premise @Softwerkskammer MUCDavid Völkel
 
Shift-Left Testing: QA in a DevOps World by David Laulusa
Shift-Left Testing: QA in a DevOps World by David LaulusaShift-Left Testing: QA in a DevOps World by David Laulusa
Shift-Left Testing: QA in a DevOps World by David LaulusaQA or the Highway
 
Craftsmanship Workshop: Coding Kata
Craftsmanship Workshop: Coding KataCraftsmanship Workshop: Coding Kata
Craftsmanship Workshop: Coding KataMichael Ibarra
 
Unit Testing
Unit TestingUnit Testing
Unit TestingAdam Birr
 
Every code coverage tool is measuring the wrong thing (on purpose)
Every code coverage tool is measuring the wrong thing (on purpose)Every code coverage tool is measuring the wrong thing (on purpose)
Every code coverage tool is measuring the wrong thing (on purpose)Sean Reilly
 
Practical TDD Demonstrated
Practical TDD DemonstratedPractical TDD Demonstrated
Practical TDD DemonstratedAlan Christensen
 
Software testing with examples in Angular (and AngularJS)
Software testing with examples in Angular (and AngularJS)Software testing with examples in Angular (and AngularJS)
Software testing with examples in Angular (and AngularJS)Paweł Żurowski
 
Getting started with Test Driven Development
Getting started with Test Driven DevelopmentGetting started with Test Driven Development
Getting started with Test Driven DevelopmentFerdous Mahmud Shaon
 
Tdd practices
Tdd practicesTdd practices
Tdd practicesaxykim00
 
Getting started with Test Driven Development - Ferdous Mahmud Shaon
Getting started with Test Driven Development - Ferdous Mahmud ShaonGetting started with Test Driven Development - Ferdous Mahmud Shaon
Getting started with Test Driven Development - Ferdous Mahmud ShaonCefalo
 
Writing Better Tests - Applying Clean-Code TDD at 99designs
Writing Better Tests - Applying Clean-Code TDD at 99designsWriting Better Tests - Applying Clean-Code TDD at 99designs
Writing Better Tests - Applying Clean-Code TDD at 99designslachlandonald
 
Test-Driven Development
Test-Driven DevelopmentTest-Driven Development
Test-Driven DevelopmentMeilan Ou
 
VT.NET 20160411: An Intro to Test Driven Development (TDD)
VT.NET 20160411: An Intro to Test Driven Development (TDD)VT.NET 20160411: An Intro to Test Driven Development (TDD)
VT.NET 20160411: An Intro to Test Driven Development (TDD)Rob Hale
 
Test Driven Development
Test Driven DevelopmentTest Driven Development
Test Driven Developmentdcsunu
 
Bigger Unit Test Are Better
Bigger Unit Test Are BetterBigger Unit Test Are Better
Bigger Unit Test Are BetterPeter Schuler
 

Similar to Transformation Priority Premise: TDD Test Order Matters (20)

Transformation Priority Premise @Softwerkskammer MUC
Transformation Priority Premise @Softwerkskammer MUCTransformation Priority Premise @Softwerkskammer MUC
Transformation Priority Premise @Softwerkskammer MUC
 
Shift-Left Testing: QA in a DevOps World by David Laulusa
Shift-Left Testing: QA in a DevOps World by David LaulusaShift-Left Testing: QA in a DevOps World by David Laulusa
Shift-Left Testing: QA in a DevOps World by David Laulusa
 
Tdd guide
Tdd guideTdd guide
Tdd guide
 
Craftsmanship Workshop: Coding Kata
Craftsmanship Workshop: Coding KataCraftsmanship Workshop: Coding Kata
Craftsmanship Workshop: Coding Kata
 
Unit Testing
Unit TestingUnit Testing
Unit Testing
 
TDD In Practice
TDD In PracticeTDD In Practice
TDD In Practice
 
Every code coverage tool is measuring the wrong thing (on purpose)
Every code coverage tool is measuring the wrong thing (on purpose)Every code coverage tool is measuring the wrong thing (on purpose)
Every code coverage tool is measuring the wrong thing (on purpose)
 
Practical TDD Demonstrated
Practical TDD DemonstratedPractical TDD Demonstrated
Practical TDD Demonstrated
 
Software testing with examples in Angular (and AngularJS)
Software testing with examples in Angular (and AngularJS)Software testing with examples in Angular (and AngularJS)
Software testing with examples in Angular (and AngularJS)
 
Getting started with Test Driven Development
Getting started with Test Driven DevelopmentGetting started with Test Driven Development
Getting started with Test Driven Development
 
Tdd practices
Tdd practicesTdd practices
Tdd practices
 
Getting started with Test Driven Development - Ferdous Mahmud Shaon
Getting started with Test Driven Development - Ferdous Mahmud ShaonGetting started with Test Driven Development - Ferdous Mahmud Shaon
Getting started with Test Driven Development - Ferdous Mahmud Shaon
 
Unit Testing talk
Unit Testing talkUnit Testing talk
Unit Testing talk
 
Writing Better Tests - Applying Clean-Code TDD at 99designs
Writing Better Tests - Applying Clean-Code TDD at 99designsWriting Better Tests - Applying Clean-Code TDD at 99designs
Writing Better Tests - Applying Clean-Code TDD at 99designs
 
Test-Driven Development
Test-Driven DevelopmentTest-Driven Development
Test-Driven Development
 
VT.NET 20160411: An Intro to Test Driven Development (TDD)
VT.NET 20160411: An Intro to Test Driven Development (TDD)VT.NET 20160411: An Intro to Test Driven Development (TDD)
VT.NET 20160411: An Intro to Test Driven Development (TDD)
 
Test Driven Development
Test Driven DevelopmentTest Driven Development
Test Driven Development
 
Tdd red-green-refactor
Tdd red-green-refactorTdd red-green-refactor
Tdd red-green-refactor
 
Introducción a TDD
Introducción a TDDIntroducción a TDD
Introducción a TDD
 
Bigger Unit Test Are Better
Bigger Unit Test Are BetterBigger Unit Test Are Better
Bigger Unit Test Are Better
 

More from Mike Clement

Collaboration Principles from Mob Programming
Collaboration Principles from Mob ProgrammingCollaboration Principles from Mob Programming
Collaboration Principles from Mob ProgrammingMike Clement
 
Focus on Flow: Lean Principles in Action
Focus on Flow: Lean Principles in ActionFocus on Flow: Lean Principles in Action
Focus on Flow: Lean Principles in ActionMike Clement
 
Taming scary production code that nobody wants to touch
Taming scary production code that nobody wants to touchTaming scary production code that nobody wants to touch
Taming scary production code that nobody wants to touchMike Clement
 
Develop your sense of code smell
Develop your sense of code smellDevelop your sense of code smell
Develop your sense of code smellMike Clement
 
Maps over Backlogs: User Story Mapping to Share the Big Picture
Maps over Backlogs: User Story Mapping to Share the Big PictureMaps over Backlogs: User Story Mapping to Share the Big Picture
Maps over Backlogs: User Story Mapping to Share the Big PictureMike Clement
 
Escaping the Pitfalls of Software Product Development
Escaping the Pitfalls of Software Product DevelopmentEscaping the Pitfalls of Software Product Development
Escaping the Pitfalls of Software Product DevelopmentMike Clement
 
Code Katas Spring 2012
Code Katas Spring 2012Code Katas Spring 2012
Code Katas Spring 2012Mike Clement
 
Linq (from the inside)
Linq (from the inside)Linq (from the inside)
Linq (from the inside)Mike Clement
 
Bowling Game Kata in C# Adapted
Bowling Game Kata in C# AdaptedBowling Game Kata in C# Adapted
Bowling Game Kata in C# AdaptedMike Clement
 
Code Katas: Practicing Your Craft
Code Katas: Practicing Your CraftCode Katas: Practicing Your Craft
Code Katas: Practicing Your CraftMike Clement
 
Software Craftsmanship
Software CraftsmanshipSoftware Craftsmanship
Software CraftsmanshipMike Clement
 

More from Mike Clement (11)

Collaboration Principles from Mob Programming
Collaboration Principles from Mob ProgrammingCollaboration Principles from Mob Programming
Collaboration Principles from Mob Programming
 
Focus on Flow: Lean Principles in Action
Focus on Flow: Lean Principles in ActionFocus on Flow: Lean Principles in Action
Focus on Flow: Lean Principles in Action
 
Taming scary production code that nobody wants to touch
Taming scary production code that nobody wants to touchTaming scary production code that nobody wants to touch
Taming scary production code that nobody wants to touch
 
Develop your sense of code smell
Develop your sense of code smellDevelop your sense of code smell
Develop your sense of code smell
 
Maps over Backlogs: User Story Mapping to Share the Big Picture
Maps over Backlogs: User Story Mapping to Share the Big PictureMaps over Backlogs: User Story Mapping to Share the Big Picture
Maps over Backlogs: User Story Mapping to Share the Big Picture
 
Escaping the Pitfalls of Software Product Development
Escaping the Pitfalls of Software Product DevelopmentEscaping the Pitfalls of Software Product Development
Escaping the Pitfalls of Software Product Development
 
Code Katas Spring 2012
Code Katas Spring 2012Code Katas Spring 2012
Code Katas Spring 2012
 
Linq (from the inside)
Linq (from the inside)Linq (from the inside)
Linq (from the inside)
 
Bowling Game Kata in C# Adapted
Bowling Game Kata in C# AdaptedBowling Game Kata in C# Adapted
Bowling Game Kata in C# Adapted
 
Code Katas: Practicing Your Craft
Code Katas: Practicing Your CraftCode Katas: Practicing Your Craft
Code Katas: Practicing Your Craft
 
Software Craftsmanship
Software CraftsmanshipSoftware Craftsmanship
Software Craftsmanship
 

Recently uploaded

Heltun_HE-RS01_User_Manual_B9AH.pdf
Heltun_HE-RS01_User_Manual_B9AH.pdfHeltun_HE-RS01_User_Manual_B9AH.pdf
Heltun_HE-RS01_User_Manual_B9AH.pdfMarielaL5
 
Dynamical systems simulation in Python for science and engineering
Dynamical systems simulation in Python for science and engineeringDynamical systems simulation in Python for science and engineering
Dynamical systems simulation in Python for science and engineeringMassimo Talia
 
LLMs, LMMs, their Improvement Suggestions and the Path towards AGI.pdf
LLMs, LMMs, their Improvement Suggestions and the Path towards AGI.pdfLLMs, LMMs, their Improvement Suggestions and the Path towards AGI.pdf
LLMs, LMMs, their Improvement Suggestions and the Path towards AGI.pdfThomas Poetter
 
Microsoft Azure News - Feb 2024
Microsoft Azure News - Feb 2024Microsoft Azure News - Feb 2024
Microsoft Azure News - Feb 2024Daniel Toomey
 
Power of 2024 - WITforce Odyssey.pptx.pdf
Power of 2024 - WITforce Odyssey.pptx.pdfPower of 2024 - WITforce Odyssey.pptx.pdf
Power of 2024 - WITforce Odyssey.pptx.pdfkatalinjordans1
 
Manual Eurotronic Thermostatic Valve Comry Z-Wave
Manual Eurotronic Thermostatic Valve Comry Z-WaveManual Eurotronic Thermostatic Valve Comry Z-Wave
Manual Eurotronic Thermostatic Valve Comry Z-WaveDomotica daVinci
 
AI MODELS USAGE IN FINTECH PRODUCTS: PM APPROACH & BEST PRACTICES by Kasthuri...
AI MODELS USAGE IN FINTECH PRODUCTS: PM APPROACH & BEST PRACTICES by Kasthuri...AI MODELS USAGE IN FINTECH PRODUCTS: PM APPROACH & BEST PRACTICES by Kasthuri...
AI MODELS USAGE IN FINTECH PRODUCTS: PM APPROACH & BEST PRACTICES by Kasthuri...ISPMAIndia
 
OTel Orientation_ How to Train Teams (OTel in Practice).pdf
OTel Orientation_ How to Train Teams (OTel in Practice).pdfOTel Orientation_ How to Train Teams (OTel in Practice).pdf
OTel Orientation_ How to Train Teams (OTel in Practice).pdfPaige Cruz
 
21ST CENTURY LITERACY FROM TRADITIONAL TO MODERN
21ST CENTURY LITERACY FROM TRADITIONAL TO MODERN21ST CENTURY LITERACY FROM TRADITIONAL TO MODERN
21ST CENTURY LITERACY FROM TRADITIONAL TO MODERNRonnelBaroc
 
5 Things You Shouldn’t Do at Salesforce World Tour Sydney 2024!
5 Things You Shouldn’t Do at Salesforce World Tour Sydney 2024!5 Things You Shouldn’t Do at Salesforce World Tour Sydney 2024!
5 Things You Shouldn’t Do at Salesforce World Tour Sydney 2024!XfilesPro
 
Breaking Barriers & Leveraging the Latest Developments in AI Technology
Breaking Barriers & Leveraging the Latest Developments in AI TechnologyBreaking Barriers & Leveraging the Latest Developments in AI Technology
Breaking Barriers & Leveraging the Latest Developments in AI TechnologySafe Software
 
Q1 Memory Fabric Forum: Intel Enabling Compute Express Link (CXL)
Q1 Memory Fabric Forum: Intel Enabling Compute Express Link (CXL)Q1 Memory Fabric Forum: Intel Enabling Compute Express Link (CXL)
Q1 Memory Fabric Forum: Intel Enabling Compute Express Link (CXL)Memory Fabric Forum
 
Curtain Module Manual Zigbee Neo CS01-1C.pdf
Curtain Module Manual Zigbee Neo CS01-1C.pdfCurtain Module Manual Zigbee Neo CS01-1C.pdf
Curtain Module Manual Zigbee Neo CS01-1C.pdfDomotica daVinci
 
Zi-Stick UBS Dongle ZIgbee from Aeotec manual
Zi-Stick UBS Dongle ZIgbee from  Aeotec manualZi-Stick UBS Dongle ZIgbee from  Aeotec manual
Zi-Stick UBS Dongle ZIgbee from Aeotec manualDomotica daVinci
 
Building Products That Think- Bhaskaran Srinivasan & Ashish Gupta
Building Products That Think- Bhaskaran Srinivasan & Ashish GuptaBuilding Products That Think- Bhaskaran Srinivasan & Ashish Gupta
Building Products That Think- Bhaskaran Srinivasan & Ashish GuptaISPMAIndia
 
The Future of Product, by Founder & CEO, Product School
The Future of Product, by Founder & CEO, Product SchoolThe Future of Product, by Founder & CEO, Product School
The Future of Product, by Founder & CEO, Product SchoolProduct School
 
How we think about an advisor tech stack
How we think about an advisor tech stackHow we think about an advisor tech stack
How we think about an advisor tech stackSummit
 
Bit N Build Poland
Bit N Build PolandBit N Build Poland
Bit N Build PolandGDSC PJATK
 
Introduction to Serverless with AWS Lambda in C#.pptx
Introduction to Serverless with AWS Lambda in C#.pptxIntroduction to Serverless with AWS Lambda in C#.pptx
Introduction to Serverless with AWS Lambda in C#.pptxBrandon Minnick, MBA
 

Recently uploaded (20)

Heltun_HE-RS01_User_Manual_B9AH.pdf
Heltun_HE-RS01_User_Manual_B9AH.pdfHeltun_HE-RS01_User_Manual_B9AH.pdf
Heltun_HE-RS01_User_Manual_B9AH.pdf
 
Dynamical systems simulation in Python for science and engineering
Dynamical systems simulation in Python for science and engineeringDynamical systems simulation in Python for science and engineering
Dynamical systems simulation in Python for science and engineering
 
LLMs, LMMs, their Improvement Suggestions and the Path towards AGI.pdf
LLMs, LMMs, their Improvement Suggestions and the Path towards AGI.pdfLLMs, LMMs, their Improvement Suggestions and the Path towards AGI.pdf
LLMs, LMMs, their Improvement Suggestions and the Path towards AGI.pdf
 
Microsoft Azure News - Feb 2024
Microsoft Azure News - Feb 2024Microsoft Azure News - Feb 2024
Microsoft Azure News - Feb 2024
 
Power of 2024 - WITforce Odyssey.pptx.pdf
Power of 2024 - WITforce Odyssey.pptx.pdfPower of 2024 - WITforce Odyssey.pptx.pdf
Power of 2024 - WITforce Odyssey.pptx.pdf
 
Manual Eurotronic Thermostatic Valve Comry Z-Wave
Manual Eurotronic Thermostatic Valve Comry Z-WaveManual Eurotronic Thermostatic Valve Comry Z-Wave
Manual Eurotronic Thermostatic Valve Comry Z-Wave
 
AI MODELS USAGE IN FINTECH PRODUCTS: PM APPROACH & BEST PRACTICES by Kasthuri...
AI MODELS USAGE IN FINTECH PRODUCTS: PM APPROACH & BEST PRACTICES by Kasthuri...AI MODELS USAGE IN FINTECH PRODUCTS: PM APPROACH & BEST PRACTICES by Kasthuri...
AI MODELS USAGE IN FINTECH PRODUCTS: PM APPROACH & BEST PRACTICES by Kasthuri...
 
OTel Orientation_ How to Train Teams (OTel in Practice).pdf
OTel Orientation_ How to Train Teams (OTel in Practice).pdfOTel Orientation_ How to Train Teams (OTel in Practice).pdf
OTel Orientation_ How to Train Teams (OTel in Practice).pdf
 
21ST CENTURY LITERACY FROM TRADITIONAL TO MODERN
21ST CENTURY LITERACY FROM TRADITIONAL TO MODERN21ST CENTURY LITERACY FROM TRADITIONAL TO MODERN
21ST CENTURY LITERACY FROM TRADITIONAL TO MODERN
 
5 Tech Trend to Notice in ESG Landscape- 47Billion
5 Tech Trend to Notice in ESG Landscape- 47Billion5 Tech Trend to Notice in ESG Landscape- 47Billion
5 Tech Trend to Notice in ESG Landscape- 47Billion
 
5 Things You Shouldn’t Do at Salesforce World Tour Sydney 2024!
5 Things You Shouldn’t Do at Salesforce World Tour Sydney 2024!5 Things You Shouldn’t Do at Salesforce World Tour Sydney 2024!
5 Things You Shouldn’t Do at Salesforce World Tour Sydney 2024!
 
Breaking Barriers & Leveraging the Latest Developments in AI Technology
Breaking Barriers & Leveraging the Latest Developments in AI TechnologyBreaking Barriers & Leveraging the Latest Developments in AI Technology
Breaking Barriers & Leveraging the Latest Developments in AI Technology
 
Q1 Memory Fabric Forum: Intel Enabling Compute Express Link (CXL)
Q1 Memory Fabric Forum: Intel Enabling Compute Express Link (CXL)Q1 Memory Fabric Forum: Intel Enabling Compute Express Link (CXL)
Q1 Memory Fabric Forum: Intel Enabling Compute Express Link (CXL)
 
Curtain Module Manual Zigbee Neo CS01-1C.pdf
Curtain Module Manual Zigbee Neo CS01-1C.pdfCurtain Module Manual Zigbee Neo CS01-1C.pdf
Curtain Module Manual Zigbee Neo CS01-1C.pdf
 
Zi-Stick UBS Dongle ZIgbee from Aeotec manual
Zi-Stick UBS Dongle ZIgbee from  Aeotec manualZi-Stick UBS Dongle ZIgbee from  Aeotec manual
Zi-Stick UBS Dongle ZIgbee from Aeotec manual
 
Building Products That Think- Bhaskaran Srinivasan & Ashish Gupta
Building Products That Think- Bhaskaran Srinivasan & Ashish GuptaBuilding Products That Think- Bhaskaran Srinivasan & Ashish Gupta
Building Products That Think- Bhaskaran Srinivasan & Ashish Gupta
 
The Future of Product, by Founder & CEO, Product School
The Future of Product, by Founder & CEO, Product SchoolThe Future of Product, by Founder & CEO, Product School
The Future of Product, by Founder & CEO, Product School
 
How we think about an advisor tech stack
How we think about an advisor tech stackHow we think about an advisor tech stack
How we think about an advisor tech stack
 
Bit N Build Poland
Bit N Build PolandBit N Build Poland
Bit N Build Poland
 
Introduction to Serverless with AWS Lambda in C#.pptx
Introduction to Serverless with AWS Lambda in C#.pptxIntroduction to Serverless with AWS Lambda in C#.pptx
Introduction to Serverless with AWS Lambda in C#.pptx
 

Transformation Priority Premise: TDD Test Order Matters

  • 1. Transformation Priority Premise: TDD Test Order Matters Mike Clement @mdclement mike@softwareontheside.com http://blog.softwareontheside.com http://agilecodegames.com
  • 2. XP Simple Design • Passes all tests • Clear, expressive, consistent • No duplication • Minimal
  • 3. TDD Review TDD • Red • Green • Refactor Ways to get Green • Fake it • Obvious implementation • Triangulation
  • 7. Example Transformations • ({}–>nil) no code at all->code that employs nil • (nil->constant) • (variable->assignment) replacing the value of a variable. • (statement->statements) adding more unconditional statements.
  • 8. Uncle Bob’s Three Laws of TDD • You are not allowed to write any production code unless it is to make a failing unit test pass. • You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures. • You are not allowed to write any more production code than is sufficient to pass the one failing unit test.
  • 10. Proposed Transformations • ({}–>nil) no code at all->code that employs nil • (nil->constant) • (constant->constant+) a simple constant to a more complex constant • (constant->scalar) replacing a constant with a variable or an argument • (statement->statements) adding more unconditional statements. • (unconditional->if) splitting the execution path • (scalar->array) • (array->container) • (statement->recursion) • (if->while) • (expression->function) replacing an expression with a function or algorithm • (variable->assignment) replacing the value of a variable.
  • 11. WORD WRAP A Fork in the Road
  • 12. Problem definition • function named Wrap that takes two arguments, a string, and a column number • The function returns the string, but with line breaks ('n') inserted at just the right places to make sure that no line is longer than the column number. • Try to break lines at word boundaries.
  • 15. "I can't seem to get this test to pass without writing a lot of untested code."
  • 16. They are the wrong tests, because you could not figure out how to pass them.
  • 17. "[W]hen faced with a problem you do not understand, do any part of it you do understand, then look at it again."
  • 19. The Premise Applied • Prefer higher priority transformations. • Choose tests that can be passed with higher priority transformations. • When a low priority transformation seems required, backtrack to see if there is a simpler test to pass.
  • 20. WHAT ABOUT SOLUTION QUALITY? Sorting Algorithms
  • 21. The Premise Applied • Prefer higher priority transformations. • Choose tests that can be passed with higher priority transformations. • When a low priority transformation seems required, backtrack to see if there is a simpler test to pass.
  • 22. Proposed Prioritized Transformations • ({}–>nil) no code at all->code that employs nil • (nil->constant) • (constant->constant+) a simple constant to a more complex constant • (constant->scalar) replacing a constant with a variable or an argument • (statement->statements) adding more unconditional statements. • (unconditional->if) splitting the execution path • (scalar->array) • (array->container) • (statement->recursion) • (if->while) • (expression->function) replacing an expression with a function or algorithm • (variable->assignment) replacing the value of a variable.
  • 24. Action Items! • Read the original post http://cleancoder.posterous.com/the-transformation- priority-premise • Sorting: http://cleancoder.posterous.com/transformation- priority-and-sorting • Fibonacci: http://cleancoder.posterous.com/fib-the- transformation-priority-premise • Flash Card: http://cleancoder.posterous.com/flash-tpp • Uncle Bob on TPP: https://vimeo.com/60561303 • “Cousin” Micah on APP: https://vimeo.com/57851350 and https://vimeo.com/59265614 • Experiment!
  • 25. Software Craftsmanship! • Participate in a local Software Craftsmanship group wherever home is for you.
  • 26. My Contact Info • @mdclement • mike@softwareontheside.com • http://blog.softwareontheside.com • http://agilecodegames.com • Utah Software Craftsmanship Group – http://utahsc.org – @utahsc

Editor's Notes

  1. Familiarity with TDDFamiliarity with Principles of Simple Design
  2. Where’s the love?There’s been an assumption that this is “regular” programming.
  3. Code has mass, some constructs have more mass than others