why test driven development?

Test Driven DevelopmentWhy Should You Care about TDD

And Automated (Unit) Testing?

Naresh JainTwitter: @nashjain

Blog: http://blogs.agilefaqs.com

Licensed Under Creative Commons by Naresh Jain1

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the TestPass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Fail

Pass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Make a little change

Fail

Pass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Make a little change

Run the Test

Fail

Pass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Make a little change

Run the Test

Fail

Fail

Pass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Make a little change

Run the Test

Fail

Pass

Fail

Pass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Make a little change

Run the Test

Refactor

Fail

Pass

Fail

Pass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Make a little change

Run the Test

Refactor

Fail

Pass

Fail

Pass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Make a little change

Run the Test

Refactor

Fail

Pass

Fail

Pass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Add a Test

Run the Test

Make a little change

Run the Test

Refactor

Fail

Pass

Fail

Pass

Test Driven Development

TDD Rhythm - Test, Code, Refactor

2

Why Learn TDD?

3

Manual (monkey) Checking by Developers and Tester

4

Stay away from (time hungry) debugger

5

Maintain Focus

6

Confidence

7

Reduce Wastage: Hand Overs

8

Helps youSlow down and Think

9

Communication

10

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Ultimate Goals

12

Ultimate Goals

• Bring JOY back to programming

12

Ultimate Goals

• Bring JOY back to programming

• Understand Code Easily

12

Ultimate Goals

• Bring JOY back to programming

• Understand Code Easily

• Produce Simple, Testable, Loosely-Coupled Design

12

Ultimate Goals

• Bring JOY back to programming

• Understand Code Easily

• Produce Simple, Testable, Loosely-Coupled Design

• Build Quality In

12

Ultimate Goals

• Bring JOY back to programming

• Understand Code Easily

• Produce Simple, Testable, Loosely-Coupled Design

• Build Quality In

• Reduce Maintenance Significantly

12

Living, up-to-date specification

13

Learning:Listen to your code

14

Testable Code by Design+

Safety Net

15

Communicate Design Decisions

16

Loosely-Coupled Design

17

Refactoring

18

Ultimate Goals

• Bring JOY back to programming

• Understand Code Easily

• Produce Simple, Testable, Loosely-Coupled Design

• Build Quality In

• Reduce Maintenance Significantly

19

Thank You!Naresh Jain

naresh@agilefaqs.com

Licensed Under Creative Commons by Naresh Jain

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