Test Driven Development: More Development Than Ever

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More Development
Than Ever
Test Driven Development

Team Lead at EPAM
Agile practitioner (CSM)
Trainer
Public speaker

Writes perfect code with no bugs
Also saves the world during coffee breaks

I’m more like
this guy

Billions of years ago…
In the stone age of computer science…
© Mutatis mutandis

© Computer History Museum

1994–95:
rediscovered by
Kent Beck
© Improve It

2014 – 1995 = ?

2014 – 1999 = 15

2014 – 2002 = 12

I spend too
much time
writing tests.

TDD
Non-TDD
Think Test Code
Think Code

Think Test Code
Think Code
Debug!!!

In reality
Think Test Code

TDD vs. debugging only
Shorter feedback cycle
Reusable test suite
Code instead of pen and paper
Genuine feeling of com...

I spend too
much time
writing tests.
I would have
spent this time
anyway.

It doesn’t apply
exactly to my
case.

Legacy code

Front-end

Embedded
systems

It doesn’t apply
exactly to my
case.
There’s a fair
chance my case
is not unique.

I’m new to the
technology,
I can’t test what
I don’t know.

It’s OK to use a debugger
It’s OK to go back and forth

Test is a hypothesis
you can prove on the spot.

I’m new to the
technology,
I can’t test what
I don’t know.
TDD in fact
helps me learn.

I have to modify
the code too
often, my tests
become waste.

Think Test Code Refactor

Think Test Code Refactor

I have to modify
the code too
often, my tests
become waste.
Code without
tests is non-existing
to me.

My project is
too agile, don’t
have time for
tests!
Well…

Requirements Waterfall
Design
Implementation
Verification
Maintenance

Agile
Requirements
Design
Implementation
Verification
Maintenance
Requirements
Design
Implementation
Verification...

My project is
too agile, don’t
have time for
tests!
I use TDD to
build in quality
into my code.

Driven
Test Development

TDD is a way to
prepare your
workplace and
keep it safe
© johnjazz

There strategy
And there’s
execution
And execution is
hard

http://kirbarn.blogpost.com
kiryl.baranoshnik@gmail.com
@kirbarn

References
Ten Years Of Test Driven Development
Why does Kent Beck refer to the "rediscovery" of test-driven development...

Books
"Extreme Programming Explained: Embrace Change" by Kent Beck, Cynthia Andres
"Test Driven Development: By Example"...

Image sources
http://commons.wikimedia.org/wiki/File:Kent_Beck_no_Workshop_Mapping_XP.jpg
http://www.freeimages.com/phot...

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