Overview on TDD & ATDD

1. TDD (Test-Driven Development)
Zohirul Alam Tiemoon
Coach (OOP Training Program @ BASIS)
Email: tiemoon@gmail.com
Blog: ztiemoon.blogspot.com
TDD

2. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator.
Quick Demo on TDD in Pet Shop Application.
What is ATDD (Acceptance Test Driven Development)?
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep design simple?
Tools of TDD/ATDD.
Who writes Unit test code and Acceptance test code?
Why TDD/ATDD?
TDD

3. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator.
Quick Demo on TDD in Pet Shop Application.
What is ATDD (Acceptance Test Driven Development)?
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep design simple?
Tools of TDD/ATDD.
Who writes Unit test code and Acceptance test code?
Why TDD/ATDD?
TDD

4. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator.
Quick Demo on TDD in Pet Shop Application.
What is ATDD (Acceptance Test Driven Development)?
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep design simple?
Tools of TDD/ATDD.
Who writes Unit test code and Acceptance test code?
Why TDD/ATDD?
TDD

5. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator.
Quick Demo on TDD in Pet Shop App.
What is ATDD (Acceptance Test Driven Development)?
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep design simple?
Tools of TDD/ATDD.
Who writes Unit test code and Acceptance test code?
Why TDD/ATDD?
TDD

6. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator.
Quick Demo on TDD in Pet Shop Application.
What is ATDD (Acceptance Test-Driven Dev.)?
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep design simple?
Tools of TDD/ATDD.
Who writes Unit test code and Acceptance test code?
Why TDD/ATDD?
TDD

7. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator.
Quick Demo on TDD in Pet Shop Application.
What is ATDD (Acceptance Test-Driven Dev.)
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep design simple?
Tools of TDD/ATDD.
Who writes Unit test code and Acceptance test code?
Why TDD/ATDD?
TDD

8. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator.
Quick Demo on TDD in Pet Shop Application.
What is ATDD (Acceptance Test Driven Development)?
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep
design simple?
Tools of TDD/ATDD.
Who writes Unit test code and Acceptance test code?
Why TDD/ATDD?
TDD

9. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator.
Quick Demo on TDD in Pet Shop Application.
What is ATDD (Acceptance Test Driven Development)?
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep design simple?
Tools of TDD/ATDD.
Who writes Unit test code and Acceptance test code?
Why TDD/ATDD?
TDD

10. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator.
Quick Demo on TDD in Pet Shop Application.
What is ATDD (Acceptance Test Driven Development)?
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep design simple?
Tools of TDD/ATDD.
Who writes Unit test code and
Acceptance test code?
Why TDD/ATDD?
TDD

11. What is TDD (Test-Driven Development)?
Principles of TDD.
Quick Demo on TDD in Calculator
Quick Demo on TDD in Pet Shop Application.
What is ATDD (Acceptance Test Driven Development)?
Quick Demo on ATDD in Calculator.
How does TDD/ATDD help to keep design simple?
Tools of TDD/ATDD.
Who writes Unit test code and Acceptance test code?
Why TDD/ATDD?
TDD

12. What is TDD (Test-Driven Development)?
TDD

13. What is TDD (Test-Driven Development)?
• Is a Test-First approach (Write the test-code first
and then write the dev-code)
• It leads to think about ‘How to use a component’
first and then about ‘How to implement’.
• As much about design technique as testing
technique.
• As much about (executable) documentation as
testing.
TDD

14. Principle of TDD
TDD

15. Principle of TDD
Kent Beck defines:
• Never write a single line of code unless you
have a failing automated test.
• Eliminate duplication.
Red (Automated test fail)
Green (Automated test pass because dev code has been written)
Refactor (Eliminate duplication, Clean the code)
TDD

16. Principle of TDD (In Practice)
Red
Green
Refactor
TDD

17. Start
Principle of TDD (In Practice)
Write a Test
Red
Green
Refactor
TDD

18. Start
Principle of TDD (In Practice)
Write a Test
Run the Test
Red
Green
Refactor
TDD

19. Start
Principle of TDD (In Practice)
Write a Test
See it fail
because there’s Run the Test
no dev code
Red
Green
Refactor
TDD

20. Start
Principle of TDD (In Practice)
Write a Test
See it fail
because there’s Run the Test
no dev code
Red Write (just enough)
Dev Code to compile
Green
Refactor
TDD

21. Start
Principle of TDD (In Practice)
Write a Test
See it fail
because there’s Run the Test
no dev code
Red Write (just enough)
Dev Code to compile
Green Run the Test
Refactor
TDD

22. Start
Principle of TDD (In Practice)
Write a Test
See it fail
because there’s Run the Test
no dev code
Red Write (just enough)
Dev Code to compile
See it fail
Green because no logic Run the Test
is implemented
Refactor
TDD

23. Start
Principle of TDD (In Practice)
Write a Test
See it fail
because there’s Run the Test
no dev code
Red Write (just enough)
Dev Code to compile
See it fail
Green because no logic Run the Test
is implemented
Refactor Write (just enough)
Dev Code to pass
TDD

24. Start
Principle of TDD (In Practice)
Write a Test
See it fail
because there’s Run the Test
no dev code
Red Write (just enough)
Dev Code to compile
See it fail
Green because no logic Run the Test
is implemented
Refactor Write (just enough)
Dev Code to pass
Run the Test
TDD

25. Start
Principle of TDD (In Practice)
Write a Test
See it fail
because there’s Run the Test
no dev code
Red Write (just enough)
Dev Code to compile
See it fail
Green because no logic Run the Test
is implemented
Refactor Write (just enough)
Dev Code to pass
See the
test pass Run the Test
TDD

26. Start
Principle of TDD (In Practice)
Write a Test
See it fail
because there’s Run the Test
no dev code
Red Write (just enough)
Dev Code to compile
See it fail
Green because no logic Run the Test
is implemented
Refactor Write (just enough)
Dev Code to pass
See the
test pass Run the Test
Refactoring
TDD

27. Start
Principle of TDD (In Practice)
Write a Test
See it fail
because there’s Run the Test
no dev code
Red Write (just enough)
Dev Code to compile
See it fail
Green because no logic Run the Test
is implemented
Refactor Write (just enough)
Dev Code to pass
See the
test pass Run the Test
Refactoring
TDD

28. Quick Demo on TDD in Calculator
Tools used in this demo:
- IDE : VS 2008
- Language : C#
- Unit Testing Tool: NUnit
- Refactoring Tool: ReSharper
TDD

29. Quick Demo on TDD in Pet Shop
Story:
As a Store keeper I
want to keep a bird in
the shop (store) which
type is parrot, price is
2500 tk, color is gray
and unique id is B-001
Tools used in this demo:
- IDE : VS 2008
- Language : C#
- Unit Testing Tool: NUnit
- Refactoring Tool: ReSharper
TDD

30. What is ATDD
(Acceptance Test-Driven Development)?
TDD

31. What is ATDD?
User Story
Acceptance Criteria 1
Acceptance Criteria 2
Acceptance Criteria n
Acceptance Test 1
Acceptance Test 2
ATDD
Acceptance Test n
TDD

32. Start What is ATDD?
Write a Test Acceptance Criteria
Run the Test
Write (just enough) Automated
Dev Code to compile Acceptance
Tests
Run the Test
Write (just enough) Unit Tests
Dev Code to pass
Run the Test Deliverable
Code
Refactoring
TDD

33. Quick Demo on ATDD in Calculator
Tools used in this demo:
- IDE : VS 2008
- Language : C#
- Unit Testing Tool: NUnit
- Acceptance Testing Tool (wiki) :
fitnesse
-Acceptance Test Server :
FitServer(.Net)
- Refactoring Tool: ReSharper
TDD

34. How does TDD/ATDD help to keep design simple?
• Just enough design and development
• No option of BDUF (Big design up-front)
• Incremental design
• Design for now not for next
• Refactoring for improving design
TDD

35. Tools for TDD/ATDD
TDD (Unit Testing): ATDD:
- .Net >> NUnit - FIT
- Jave >> JUnit - FitNesse
- C++ >> gUnit - Selenium
- Python >> PyUnit - Sahi
- Ruby >> Test::Unit - Frankenstein
TDD

36. Who writes Unit/Acceptance Test Code?
Unit Test:
- Developer
writes it.
Acceptance Test:
- Customer
Customer role can be played by:
- Stake holders
-QA
-Product owner
- Developer
-Business Analyst
TDD

37. Why TDD/ATDD?
• No dead code
• Simple design
• Have full-coverage test code so maintenance and
refactoring are easy (not nightmare)
• Executable documentation
• No (or minimum) debugging
TDD

38. References
• Kent Beck: Test-Driven Development: By Example, Addison-Wesley, 2002.
• Test Driven .NET Development with FitNesse, Gojko Adzic
• Test-Driven Development in Microsoft .NETby James W.
Newkirk and Alexei A. Vorontsov
• http://www.slideshare.net/nashjain/acceptance-test-driven-development-
350264
• http://blogs.agilefaqs.com/
• http://www.objectwind.com/present/FitNesse.htm
• http://www.xprogramming.com/software.htm
• http://testdrivendeveloper.com/
• http://fit.c2.com/
• http://fit.c2.com/wiki.cgi?JavaDownloads
• http://fit.c2.com/wiki.cgi?DotNetDownloads
• http://fitnesse.org/
• http://sourceforge.net/projects/fitnesse
TDD

39. Thanks to:
* Fahim Mashroor (CEO, bdjobs.com)
* Fokhruz Zaman (Cofounder & CTO of Millennium
Information System Limited.)
* BASIS (Bangladesh Software Association & Information
Services)
TDD

40. TDD

41. TDD