Add TDD to your toolboxan introduction for beginners

Audrey Troutt @auditty

Audrey Troutt @auditty

What is TDD? Test-Driven Development

Audrey Troutt @auditty

Three conditions to achieve a flow state:

1. clear set of goals and progress

2. clear and immediate feedback

3. confidence in one's ability

Csikszentmihalyi, M.; Abuhamdeh, S. & Nakamura, J. (2005), "Flow", in Elliot, A., Handbook of Competence and Motivation

“TDD is dead. Long live testing.” -David Heinemeier Hansson

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Audrey Troutt @auditty

Materials needed:Source code

Unit testing frameworkUnderstanding of requirements

Audrey Troutt @auditty

Simple Case: There’s a bug

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Use Case: From the Ground Up

Audrey Troutt @auditty

“As the tests get more specific, the code gets more generic.”

-Uncle Bob Martin

Audrey Troutt @auditty

Read more: http://bit.ly/1Bs2h70

● ({}–>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)

● … and so on

Audrey Troutt @auditty

Read more: http://bit.ly/1Bs2h70

Pros:● More tests● More testable code● Discover missing

requirements sooner● Uncover novel designs● Increased quality● Refactor/add on with

confidence● Doesn’t generally take

more time● May start conversations

Cons:● First time setup of test

framework takes extra time

● Not always practical (if requirements are not well defined)

● Makes changing object model harder

● May start conversations

Audrey Troutt @auditty

“I credit TDD for teaching me how to test, and I still get huge benefits when I TDD. It’s not perfect, but no one technique is the key to magically producing better code.”

-Justin Weiss

Audrey Troutt @auditty

Read more: http://bit.ly/1BVRR1y

Practice http://codekata.com/

Learn from others http://katas.softwarecraftsmanship.org/

Audrey Troutt @auditty