emilybache/Parrot-Refactoring-Kata

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emilybache/Parrot-Refactoring-Kata

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Kata to learn about Polymorphism

Support this and all my katas via Patreon

Parrot Refactoring Kata

Can you spot any code smells in this code? I'll give you a clue - a spot of Pol(l)ymorphism should improve matters!

Refactor this code, take small steps, run the tests often. See how small and beautiful and polymorphic you can make it.

I made a video explaining this kata, and another video with a worked solution in C#.

Acknowlegements

This code is heavily inspired by one of the examples in Martin Fowler's book "Refactoring". It's a classic, and if it's not on your bookshelf already I suggest you treat yourself to a copy!

GildedRose-Refactoring-Kata

Starting code for the GildedRose Refactoring Kata in many programming languages.

Tennis-Refactoring-Kata

This is a Refactoring Kata based on the rules of Tennis

Racing-Car-Katas

The starting code for several code katas on a racing car theme

Theatrical-Players-Refactoring-Kata

Example from first chapter of 'Refactoring' by Martin Fowler, with tests and translations

KataTrainReservation

A Kata exercise. This one involves writing code to reserve seats on a train.

SupermarketReceipt-Refactoring-Kata

This is a refactoring kata for improving your coding skills

Yatzy-Refactoring-Kata

Starting code for a Refactoring Code Kata on the Yatzy rules

Phone-Numbers-Kata

Some sample data you could use to help test your solution to the Phone Numbers code kata, and a script to create it.

Product-Export-Refactoring-Kata

exercise for practicing refactoring

Lift-Kata

starting position for the Lift Kata with an Approval Testing approach

Clarify-Exception-Refactoring-Kata

For practicing refactoring, removing duplication, and making code more flexible

CustomerSync-Refactoring-Kata

Refactoring exercise where data layer and business layer are not clearly separated

DiamondKata

skeleton solution and test cases for comparing iterative and incremental approaches

Necklace-Refactoring-Kata

the goal is to practice refactoring to a Chain of Responsibility pattern

Online-Shopping-Kata

Refactoring Kata to practice teasing out incohesive, coupled code

Email-Sender-Refactoring-Kata

Code from Michael Feathers presentation about "Tell, Don't Ask" at Craft 2019

Hands-On-Approval-Testing-For-Developers-Materials

exercises for this training course offered via O'Reilly

ValidateAndAddProduct-Refactoring-Kata

a kata for practicing both testing with Combination Approvals and 'Split Phase' refactoring

vsftpd-server

docker image for vsftpd ftp server

StrangeCharacters-TestDesign-Kata

for writing tests that check correct objects are included in a list

OvertimeCalculation-Refactoring-Kata

a refactoring exercise with a complex conditional for dividing overtime hours into two rates

DeliveryController-Refactoring-Kata

refactoring kata where you need a mock or stub

Scrabble-Kata

starting code and instructions to help you with the Scrabble kata

KataMedicineClash

Sample solution and graph visualization code for the MedicineClash Code Kata

ApprovalTools

useful little scripts

Horse-Kata

An exercise for practicing Test-Driven Development

IceCreamForecasting-Refactoring-Kata

an exercise for getting awkward code under test

DungeonEscape-Refactoring-Kata

Write tests for a command line program that takes user input.

TimerExpiry-Refactoring-Kata

exercise to practice removing duplication

Single-Sign-On-Kata

a kata useful for understanding Test Doubles

CashMachine-Refactoring-Kata

sample code for explaining the Law of Demeter

LeapYearTestExamples

Documents a variety of ways to write unit tests for the Leap Year Kata

FancyCommand-Refactoring-Kata

For practicing refactoring techniques like 'peel' and approval testing xml

Encryptor-Refactoring-Kata

refactoring kata

RefactoringGolf

Practice using your refactoring tools with 'before' and 'after' code snippets

SafeCalculator-TestDesign-Kata

the code has a bug and needs some unit tests. You'll need a test double too.

VendingMachine-Approval-Kata

An exercise for learning about Approval testing and in particular designing a printer

personnummer

library for generating Swedish personal numbers for testing purposes

FizzBuzzKata-Samples

Some sample solutions to the FizzBuzz Kata, to provoke discussion.

BeeFriendly

app for learning about testing in a microservices architecture

pytest-approvaltests

Plugin to configure pytest for use with approval tests

Yatzy-Vendor-Assessment-Kata

Exercise in finding bugs in three competing implementations of the Yatzy rules

Approvals-Puzzles

Which of these programs are suitable to be tested with Approval Testing?

Theater-Kata

K8sAudit-Kata

an exercise for practicing TDD when you have dependencies on a REST API and a file system

starter

empty starting projects in various languages

StrangeCharacters-Refactoring-Kata

refactoring exercise to practice extract method and extract class

EventParserDesignKata

For better understanding that how you set up your tests changes the design of your production code.

TirePressure-Kata

code kata for learning more about test doubles and SOLID principles

LockController-Refactoring-Kata

for practicing testing a class with awkward dependencies

Refactor-Conditionals

some examples of ways to refactor conditional statements

Phonebook-Python-Example-Project

example project using Python and Pytest with standard layout of files

MarsRover-Kata

Sample solution to the Mars Rover Kata with different testing approaches

DiscountApplier-TestDesign-Kata

the code has bugs and needs some unit tests. You'll need a test double too.

ShoppingBasket-TDD-Kata

Starting code for doing the Shopping Basket kata with TDD https://sammancoaching.org/kata_descriptions/shopping_basket.html

Spiral-Refactoring-Kata

This code works but could do with some attention to make it more readable and maintainable.

Encode-TestDesign-Kata

the code works and the tests pass, can you make the code easier to maintain?

VoidFunctionNoArgs-Refactoring-Kata

exercise to practice getting a void function with no arguments under test and refactored

EnvironmentalControllerKata

sample code for discussing test design principles

gothpy-katas

A collection of code (mostly katas) done at the GothPy meetings

RPG-Combat-Approval-Kata

starting position for the RPG Combat Kata with an approval testing approach

Cloud-Migration-Refactoring-Kata

Exercise in good use of test doubles and the dangers of mandating 80% test coverage

FIRST-Test-Design-Kata

to practice writing test cases that follow the FIRST principles

FizzBuzz-Refactoring-Kata

For practicing "make the change easy, then make the easy change"

TicTacToe-Kata

Starting code for the TicTacToe Kata including a printer for the board

UI-Katas

Kata exercises that have user interfaces.

Roadload-Refactoring-Kata

A calculation with some duplication and no tests

Yatzy-Approval-Kata

Excercise to help you learn how to use approval testing and TextTest in particular

Device-Driver-Kata

a Kata for practicing the use of Mocks

RecentlyUsedList-Test-Design-Kata

for practicing test design, fixtures in particular

GameOfLife-Refactoring-Kata

Code that works but which could do with some attention to make it more readable and maintainable.

patients

Sample application for testing

Recently-Used-List-Docs

practice writing user documentation based on unit tests

ApprovalTests.Python

python port of the ApprovalTests library http://approvaltests.sourceforge.net/

CalcStats-TestDesign-Kata

for practicing test design using https://sammancoaching.org/kata_descriptions/calc_stats.html

sbt-texttest

SBT plugin that can run texttests in your sbt projects.

buildstats

keep track of how long the build is taking

ChainOfResponsibility-Pets

A lighthearted codebase to remind you what a Chain Of Responsibility design pattern looks like

WikiSearchKata

a kata for practicing a refactoring: template method -> strategy pattern

Yatzy-Prompts

for introducing typist and navigator roles

GildedRose-Approval-Kata

Same problem code as for GildedRose-Refactoring-Kata, but set up for TextTest Approval tests

MarsRover-Screencast

the repo I used when I recorded myself solving this kata in Java

MetricTables-Kata

starting position for a from-scratch TDD exercise

HtmlConverter-Kata

Code kata for learning about test doubles and SOLID principles

TestDesign-Samples

some examples to get you thinking about test design.

TrigMath-Kata

some code for trig math calculations that you should add tests for, as an exercise

PipelineSimulation

Screencast-Katas

The code I end up with after doing a screencast

Instavoiced-Architecture-Kata

Materials to supplement this kata

ShoppingBasket-Test-Design-Kata

to practice making full use of your test framework to get the best possible feedback when you have a bug

MarsRover-Sample-Tests

sample tests for mars rover kata, for review

texttest-maven-plugin

Plugin to enable you to run tests created with TextTest as part of a maven build.

SupermarketReceipt-Java

just the java version of this refactoring kata

Supermarket-Kata-Sample-Tests

Sample test cases for Supermarket Kata, for review and discussion

ClosestToZero-Parameterized

practice writing parameterized tests and interpreting failures

Auction-TestDesign-Kata

for learning about test design, specifically with Mocks

TurnTicket-Kata

Code kata for learning more about Test Doubles and SOLID principles

WordWrap-TestDesign-Kata

several implementations which you can test with the same test cases

HandbagEvent-Refactoring-Kata

Exercise to practice sorting out a bumpy road smell