Test driven development
Radim Göth


https://lh3.googleusercontent.com/GEXX6VCb39lo0hDgesXqsr8XZkhErlxeoedxefFhRhOFMaVBWAqbxug9yc-8gdFsL
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Test pyramid
http://watirmelon.files.wordpress.com/2012/01/idealautomatedtestingpyramid.png
http://martinfowler.com/bliki/images/testPyramid/pyramid.png

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

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
•More assert per test
•Refactor the test (e.g. custom assert method)
•At least add the description to assert

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.
•