Test-driven Development Practices in White Box Test Automation

Ervin LohALM Program ManagerK365Labs Sdn Bhd

Typical result?

What is Test-driven Development?

“Test-Driven Development seeks specification, not validation, letting you think through your design before you write your functional code”

- Scott Ambler

“Test-Driven Development is a powerful way to produce well designed code with fewer defects”

- Martin Fowler

Test-driven Development Stages

In Extreme Programming Explored (The Green Book), Bill Wake describes the test / code cycle:

Write a single test

Compile it. It shouldn’t compile because you’ve not written the implementation code

Implement just enough code to get the test to compile

Run the test and see it fail

Implement just enough code to get the test to pass

Run the test and see it pass

Refactor for clarity and “once and only once”

Repeat

Test Driven DevelopmentThe motto "Red, Green, Refactor."

Get Agile – Test Driven Development

Tools For Agility, Kent Beck

Practices

Tools

The Demo Scenario

The ConfigurationAn application, Tailspin Toys that builds in Visual Studio 2010

A fully configured Visual Studio 2010 Premium and Team Foundation Server 2010 environment

What’s NeededA lot: tests and builds

Step 1: Unit Test

A method by which individual units of source code are tested to determine if they are fit for use.

Unit Tests with Visual Studio 2010

Step 2: Test Impact Analysis

A method to identify the tests that need to be run for the latest code change.

Integrating Unit Tests and Test Impact Analysis with

Visual Studio 2010

Step 3: Code Coverage

A method to describe the degree to which the source code of a program has been tested.

Integrating Unit Tests and Code Coverage with Visual

Studio 2010

Step 4: Build Automation

An act of automating a wide variety of tasks such as compiling computer source code into binary code, packaging binary code, and running tests.

Integrating Build Automation and Unit Tests

Quality Indicators

Iteration 1 Iteration 3 Iteration 4 Iteration 5Iteration 2

91

20

51

76

60

56

19

18

40

71

80

5.32

12

8

9

Starting Test Driven DevelopmentCreating a cultural change is hard…

….. and it can be done

Questions & Answers

Resources

Brian Marick’s Sitehttp://www.testdriven.com

Guidelines for Test-Driven Developmenthttp://msdn.microsoft.com/en-us/library/aa730844(v=vs.80).aspx

Using TDD with ASP.NET MVChttp://msdn.microsoft.com/en-us/library/ff847525.aspx

Apply Test-Driven Development to your Database Projectshttp://msdn.microsoft.com/en-us/magazine/cc164243.aspx

Improve the Design and Flexibility of Your Project with Extreme Programming Techniqueshttp://msdn.microsoft.com/en-us/magazine/cc163982.aspx

Recommended Bookstest-driven development: A Practical GuideDave Astels

Prentice-Hall/Pearson Education, 2003

ISBN 0-13-101649-0

Review available on my web-site

______________________________________

Test-Driven Development: By Example Kent Beck

Addison-Wesley, 2003

ISBN 0-321-14653-0

Recommanded BooksRefactoring: Improving the Design of Existing

CodeMartin FowlerAddison-Wesley, 1999ISBN 0-201-48567-2

__________________________________

Test-Driven Development in Microsoft.NETJames W. Newkirk; Alexei A. Vorontsov

Microsoft Press, 2004

ISBN 0-7356-1948-4

xUnit.net & xUnit Test Pattern

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