Overview on TDD (Test Driven Development) & ATDD (Acceptance Test Driven Development)

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

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

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

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

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

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

What is TDD (Test-Driven Development)? TDD

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

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

Principle of TDD (In Practice) Red Green Refactor TDD

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Overview on TDD (Test Driven Development) & ATDD (Acceptance Test Driven Development)

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Overview on TDD (Test Driven Development) & ATDD (Acceptance Test Driven Development)