Test-Driven Development (TDD) Process

TDD elaborate 2011-06-10

This is not a whole story of TDD. This is not a whole story of developing Actually, there is no neat end of developing :P

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What is TDD? Test Driven Development http://en.wikipedia.org/wiki/Test-driven_development It is a Software Development Process Family of Agile Key words Automated unit tests Assertions Refactoring Writing a code

Be careful! TDD is not an omniscience technique! Usually, imported as part of process However, if you decided, please keep it during development

TDD Process A Process cycle is composed in 4-5 stages Adding a test Running a test and check Writing code Testing again Refactoring the code

Process Diagram Refactoring

( ) TODO List Backlog TDD Review 3 TODO List

Good to Frameworks! JUnit (Java unit test framework) Python unit test module import unittest What relation? Django unit test module from django.utils import unittest A lot of unit testing frameworks http://en.wikipedia.org/wiki/List_of_unit_testing_frameworks xUnit is a general term for unit test frameworks

! What is Agile? What is Unit test? What is Assertion? What is Refactoring? What is Framework?

Agile A group of software development http://en.wikipedia.org/wiki/Agile_software_development http://agilemanifesto.org/ Break tasks into Short term work Cross function, self organizing Face to Face communication Customer Representatives Each routine should make working software For a short term project not a 10 year project, over 50 people project Matched to the current trend of software development

All right.. Let s see examples Bowling Scoring Program (Java with Junit) (Python with Django test)

Bowling Score Do you like bowling? Have you ever have a question about how bowling score is graded? I didn t know until this seminar

Bowling keyword Game Throw Frame Spare Strike Understandable???

Start of thinking What can happen in Bowling Game? When a ball is thrown add knock downed pins Want to know score of a frame Want to total score of a current game

Thinking of Tests Start of thinking Test Cases Adding score Getting Score Of a Frame Getting Total score

Write test codes public void testGameStart() { Game g = new Game(); assertEquals(0, g.getScoreOfFrame(0)); assertEquals(0, g.score()); } Understandable??? public void testThrowOnce() { setUp(); game.add(5); assertEquals(5, game.score()); } Any question??? public void testThrowTwice() { setUp(); game.add(5); game.add(6); assertEquals(11, game.score()); }

More test codes public void testThrowWithSpare() { setUp(); game.add(3); game.add(7); game.add(6); game.add(2); assertEquals(16, game.getScoreOfFrame(1)); // 3 + 7 + (6) } Understandable??? public void testThrowWithStrike() { setUp(); game.add(10); game.add(7); game.add(1); assertEquals(18, game.getScoreOfFrame(1)); // 10 + (7+1) } Any question???

Practice Let s see Eclipse We will cover there Quite lots of explanation would be given

( ) : Sigma ( * ) / Sigma( )

Specification Web based Users would have simple Interface , (input) (get) (result) Django 3

Like this! <form action="get.html" method="get"> <div> <input type="text" size="5"> <input type="submit" value="Get!"> </div> </form> <form action="result.html" method="post"> <div> <input type="text" name="s1"> <select name="g1"> <option value="1">A+</option> <option value="2">A0</option> <option value="3">A-</option> </select> </div>

Start Django You already know django-admin startproject gpa django-admin startapp input django-admin startapp get django-admin startapp result I know it is redundant work

Thinking of Tests Right inputs Right formats and values of POST, GET Right Result of GPA

Practice Let s see vim We will cover there It seems to be easy, huh? But, there would be quite a lot of explanation

This not end!!!

Category of Tests Authentication Test DB Test HTTP Test Everything can be tested and should be tested

Be Careful again Don t be afraid of Failing Tests! Fail is mother of pass?!?! Be thoughtful when you writing a Test Don t think whole at once Don t make testing lead you, you must lead the tests!

Please Study hard! TDD , framework (1/8) Reference

It Looks Hard No, it s not that hard I just make it verbose to show you This seminar is not that practical Always, first time is hard More trials, more easy work

Keep it mind Homework I will check if there are test cases in your mini-project next week Be prepared!

Q&A Thanks Special thanks to Combacsa

Reference http://www.agiledata.org/essays/tdd.html http://www.martinfowler.com/bliki/Xunit.html http://en.wikipedia.org/wiki/Test_automation http://en.wikipedia.org/wiki/XUnit http://en.wikipedia.org/wiki/Test-driven_development https://docs.djangoproject.com/en/dev/topics/testing/ http://www.junit.org/ http://en.wikipedia.org/wiki/Agile_software_development http://agilemanifesto.org/ http://sparcs.org/seminar/attachment/combacsa-20100612-2.pptx