Home TDD, Refactoring and DevOps

@BillyGarnet
Deliver:Agile 2018 
Austin, Texas
Home DevOps
Doing all the right things on a small scale 
 
1
Bryan Beecham

@BillyGarnetIceberg Ideas
Programming with Rick
• Met once a week
• Desktop game in VB6
• Map tiles, turned based
• Manual version control
• Much effort, little results

THE NEW STUFF
What has changed in software development?

Update Frequency

# of contributors

Storage + Collaboration

Memory

Waterfall

Agile Manifesto
We are uncovering better ways of developing 
software by doing it and helping others do it. 
Through this work we have come to value: 
 
Individuals and interactions over processes and tools 
Working software over comprehensive documentation 
Customer collaboration over contract negotiation 
Responding to change over following a plan 
 
That is, while there is value in the items on 
the right, we value the items on the left more.

Scrum

Extreme Programming

Lean Software Development
1. Eliminate Waste
2. Amplify Learning
3. Decide as late as possible
4. Deliver as fast as possible
5. Empower the team
6. Build integrity in
7. See the whole

Lean Startup
Entrepreneurs are everywhere
Entrepreneurship is management
Validated learning
Innovation accounting
Build-measure-learn

DevOps
Flow
Feedback
Continuous Learning

DevOps
@jezhumble

Microservices
Microservices is a software development technique—a
variant of the service-oriented architecture (SOA)
architectural style that structures an application as a
collection of loosely coupled services. In a
microservices architecture, services are fine-grained and
the protocols are lightweight.

API
An Application Programming Interface (API) is a set of
functions, procedures, methods or classes used by
computer programs to request services from the operating
system, software libraries or any other service providers
running on the computer.

Stress!!!
Decision Anxiety

WHAT CAN WE DO ABOUT IT?
A NEW APPROACH

@BillyGarnet
Identify - Prepare - Improve - Clean
Process for making change
24

Process for making changes
Identify
Prepare
Improve
Clean

Refactoring Process
Identify
Prepare
Improve
Clean

Refactoring Process
Identify
Prepare
Improve
RestoreRealign
Reset
Ready

Step 1 - Identify
• Recognize a change that
can be made

• Find a pattern

• Come up with a hypothesis

• Notice a problem

Step 2 - Prepare
• Make the change easy, then make the
easy change

• Adjust to match a pattern

• Create an experiment

• Take one step backwards

• Disrupt current system

• Unlocking potential

Step 3 - Improve
• Make the change

• Extract duplication

• Run the experiment

• Take two steps forward

Step 4 - Clean
• Remove any
extraneous items

• Delete duplicate code

• Clean up experiment

• Leave things cleaner
then you found them

• Ready environment for
new observations

Example
• Identify - I’m hungry

• Prepare - Get food out, slice tomato, toast
bread, etc… and create a sandwich

• Improve - Take care of that hunger by eating the
sandwich

• Clean - Put the food away, clean your dishes.

Example
• Identify - These walls need to be painted

• Prepare - Clear items out of room, tape edges,
put down drop cloth

• Improve - Paint the walls

• Clean - Remove tape, wash brushes, put extra
paint away

Code Example
• Identify - Notice two pieces of code are similar

• Prepare - Make the pieces of code identical 
(extract variable, etc.)

• Improve - Use extract method

• Clean - Delete any unneeded code and spaces
(GUIs are getting better at helping here)

Code Examples
• Industrial Logic blog:  
https://www.industriallogic.com/blog/inside-refactoring-
prepare-improve-and-clean/

• Llewellyn Falco video: 
https://www.youtube.com/watch?v=Fw-knDwOZTU

• Martin Fowler blog: 
https://martinfowler.com/articles/preparatory-
refactoring-example.html

What to do?
• What do I want to build?

• What language?

• Web, Mobile?

• Uh-oh graphics? Sketches?

• Goals? Plans?

• Why am I doing this again?

Step 1 - Identify
• Make a web based game

• Use python

• Use micro-services

• Learn more about APIs

• Use DevOps

• Use Agile Technical Practices

Step 2 - Prepare
• Read up on things

• Find technology to help with
hosting, storage

• Install necessary software

• Update software on my system

• Ability to grow in the future
(hopefully!!!)

Get Inspired!!!

Upgrade everything

Just enough design
API Gateway Dice Rolls
Map
Hello, world!
random.org
JSON files
Image DB

What would be cool?
Dungeon Imp
Others?
My Game
Your Game
Stories

More issues
• Web Hosting

• Source Control

• Build

• Deliver

• Monitor

• Scale

Heroku

Agile Principles
Our highest priority is to satisfy the customer through early and continuous
delivery of valuable software.

Deliver working software frequently… 
Working software is the primary measure of progress. 
Continuous attention to technical excellence and good design enhances
agility. 
Simplicity--the art of maximizing the amount of work not done--is essential.

Improve
• Create some code

• Push the code

• Check it in production

Enough presentation
already…let’s see
some code!!!

Clean
• Simplify the process

• Clean up the code

• Remove any unneeded items

• Boy scout rule

• Might be the most important
step

Manage your workflow
• Question your process
• Work in small pieces
• Get more feedback
• Simplify
• Embrace new techniques

Refactor everything

• Simplify
• Identify-Prepare-Improve-Clean
• Use a good IDE

Make testing more important
• Test Driven Development (TDD)

• Behaviour Driven Development (BDD)

• Organize tests by speed not type

• Once tests take longer run them 
less frequent or break them up

Good things
• Feature flags

• Continuous Integration

• Small changes at a time

• Lots of testing

• Flow

• Breaks

Conclusion
• Deploy code as soon and often
as you can

• Do the simplest thing that can
possible work


• #nobranch

• Use your app a lot

@BillyGarnet
Identify - Prepare - Improve - Clean
Process for making change
59

Questions?

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