Test driven development
Radim Göth


Outline
•Extreme programming
•What is TDD and how it is practiced
•Unit testing
•Installing NUnit
•Coding katas

Test pyramid
http://watirmelon.files.wordpress.com/2012/01/idealautomatedtestingpyramid.png
https://martinfowler.com/bliki/TestPyramid.html
https://martinfowler.com/bliki/images/testPyramid/test-pyramid.png

Unit vs integration testing
8
12
UnitA
UnitB

https://lh3.googleusercontent.com/GEXX6VCb39lo0hDgesXqsr8XZkhErlxeoedxefFhRhOFMaVBWAqbxug9yc-8gdFsL
E6YENo6TKcvBlIRL5sbiR-eY2o0ZY9r1dl_SrQuNICI2dSbCi5yx621IbfWv7yvcXshHSM
J. Ráček, Analýza a návrh systémů

https://upload.wikimedia.org/wikipedia/commons/thumb/8/84/Extreme_Programming.svg/240px-Extreme_Pro
gramming.svg.png
Extreme Programming
•Stand ups
•Planning game
•Pair programming
•TDD
•Collective code ownership
•Continuous integration
•Code is everythink
•No useless analysis
•No useless documentation

Naming conventions
•Project naming
•<ProjectUnderTest>.Tests
•
•Class naming
•<ClassUnderTest>Tests
•
•Test method naming
•Given_When_Then
•<methodUnderTest>_Given_Then
•
•

Unit test structure
•Arrange
•Act
•Assert
•
•One Assert per test (ideal situation)
•More assert per test
•Could be refactored (e.g. custom assert method)
•Only if it doesn’t make sense to divide test into several others

TDD
•Kent Beck – reinvented TDD, invented XP
•Software development process
•Pair programming
•Rules:
•Write failing test
•Write simplest implementation to pass the test
•Refactor your code
•Repeat
•
https://manojjaggavarapu.files.wordpress.com/2012/07/redgreenrefacor.png

Image result for karate
Coding katas
•Is a way to
•exercise your brain
•exercise TDD
•learn new language

Leap year excercise
•Write a function that returns true or false depending on whether its input integer is a leap year
or not.
•
•A leap year is divisible by 4, but is not otherwise divisible by 100 unless it is also divisible
by 400.
•
•2001 is a typical common year
•1996 is a typical leap year
•1900 is an atypical common year
•2000 is an atypical leap year

Fizz buzz
•Fizz Buzz is a mathematical game which is played with a group of people. Each person says a number
in sequence, but when the number is a multiple of 3, they have to say "Fizz", when it is a multiple
of 5 they have to say "Buzz", and if it is a multiple of both 3 and 5, "FizzBuzz". If someone makes
a mistake and it is noticed, they are out.
•
•A typical game might start like: 1, 2, Fizz, 4, Buzz, Fizz, 7, 8, Fizz, Buzz, 11, Fizz, 13, 14,
Fizz Buzz, etc.
•
•string FizzBuzz(int start, int count)

Events
•http://codingdojo.cz/
•http://globalday.coderetreat.org/
•