Moving towards zero defects with Specification By ExampleSteve Rogalsky

(Track Sponsor)

@srogalskywinnipegagilist.blogspot.com

Choose 2 of these topics to discuss:1. Talk about your approach to quality and

the results of that approach.2. Talk about your approach to

requirements and how you keep those requirements up to date.

3. Talk about any previous experience with automated testing.

4. Talk about your team’s current bug tracking process.

5. Talk about zero defects – Is it possible? Is it responsible? Cost effective?

A story of Zero Defects

A SCIENCE EXPERIMENT

Specification By Example improves Quality & Speed

HYPOTHESIS:

DEFINITIONS:

Acceptance Testing Is...

Goal: To build the right thing the first time.

What is Specification By Example?

Also known as / similar to:

ATDD – Acceptance Test Driven Development

BDD – Behaviour Driven Development

What is Specification By Example?

WRITE EXAMPLES (Acceptance Tests)(up front but not UP FRONT)

instead of requirements

SPECIFICATION BY EXAMPLE

To do this we:

1.Given muppet <Animal> When measuring <Craziness> Then return <10>

Given muppet <Animal> When <Drumming> Then return <Phenomenal Skillz>

Given muppet <Animal> When <talking> Then return <Grunt>

TEST AS SOON AS POSSIBLEFIRST

in collaboration with the developers and customers

2.To do this we:

AUTOMATE our examples

To do this we:

3.

AN EXAMPLE:

Requirement: Bring home something small from Europe

What I brought: What she wanted:

ANOTHER EXAMPLE

User Story: As an employee I want to receive overtime pay

a standard wage per hour for the first 40 hours worked

1.5 times their wage for each hour after the first 40 hours

2 times their wage for each

hour worked on Sundays and

holidays

For each week, hourly employees are paid:

(40*$20) = $800.00

a standard wage per hour for the first 40 hours worked

1.5 times their wage for each hour after the first 40 hours

(40*$20) + (5*$20*1.5) = $950.00

2 times their wage for each

hour worked on Sundays and

holidays

(40*$20) + (8*$20*1.5) +(8*$20*2) = $1,360.00

(40*$20) + (8*$20*1.5) +(8*$20*2 ) = $1,360.00

*1.5

2 times their wage for each

hour worked on Sundays and

holidays

Executable Specificatio

ns

Credit: This example is from “The Role of Quality Assurance in Lean-Agile” – Allan Shalloway

Defect Tracking

Where should we focus our automated testing?

UI

Services

Classes/Functions

Focus Here First

TDD

Later…

Credit: Testing Triangle first shown by Patrick Wilson-Welsh

'''

What does it take to set this up?

It is simpler than this…

1. Download FitNesse (free)2. Run FitNesse3. Add A Reference to your

project4. Create a Fixture per set of

examples5. Write the examples6. Press a button

Steps:

How to do it?

Choose Story

Expand into

Examples

Think about how

Review

Automate

Examples

Code / TDD

Passes All

tests = done

High Level Tests

Tester

Developer

Customer and Team

THE EXPERIMENT

Steps:• Fold the paper in half• Open the folded paper up and make two

triangle folds for the ‘nose’ of the plane• Re-fold the plane in half and fold two wings

(one on each side…)• Finally, fold two wing flaps

Airplane Factory!

CONCLUSIONS

1. Communicate!2. Write Executable Examples

instead of requirements3. The Tooling is simple to use

and free4. Zero Defects isn’t impossible –

build it right the first time5. Trash your Defect Tracker

TO SUMMARIZE

Specification By Example:

winnipegagilist.blogspot.com

@srogalskyhttp://fitnesse.org/

http://gojko.net/fitnesse/

http://seleniumhq.org/

steve.rogalsky@protegra.com

Links Contact Info

Questions?

THANKS!

http://www.slideshare.net/SteveRogalsky/moving-towards-zero-defects-with-specification-by-example