Essential design patterns

Covers essential design patterns handy for building clean test automation framework using Java

The problem domains

• The Builder Pattern and SLA principle are around a Vet clinic, where you can take your pets to be treated when they are sick. Example activities include visiting the clinic, feeding pets, vaccinating pets
• The Basic Strategy Pattern, and Strategy Pattern with Factories is around a Player who plays different games
• The Strategy Pattern w/ Functions is around a Sales Tax System
• For Strategy Pattern w/ Lambdas and Function Interface, go back to the Vet Clinic again

Work is distributed...

..under several branches of the vet-clinic repo, each branch containing some strater code that's refactored and improvised on via the design pattern Some work is also within the java-for-testers repo

Builder pattern:

• WhenWeCreateANewDog.java https://github.com/ashwiniraokarai/vet-clinic/commits/kata/builder/start/

• and under builderpattern package in java-for-testers repo, master https://github.com/ashwiniraokarai/java-for-testers/commits/master/

• WhenWeCreateANewDogWithExternalBuilder.java under the dedicated builderpattern package https://github.com/ashwiniraokarai/java-for-testers/commits/master/

Hamcrest Matchers - for Collections and Lists

https://github.com/ashwiniraokarai/vet-clinic/tree/tutorial-2/start/src/test/java/serenitylabs/tutorials/vetclinic/domain

Single Level Of Abstraction Principle (SLA)

https://github.com/ashwiniraokarai/vet-clinic/tree/kata/sla/repeat-2

Refactored to "Domain Specific Language"

vet-clinic/src/main/java/serenitylabs/tutorials/vetclinic/model/FoodDispenser.java

Line 54 in 144c92f

return new Meal(withRightQuantity(pet), withRightFoodType(pet));

Polymorphism

Polymorphism using Inheritance

See test file: WhenCollectingAnimals.java in vet-clinic repo, branch kata/sla/start https://github.com/serenity-dojo/vet-clinic/blob/d0db6d841dd1b00fdcc269a4679a5e198281e0e3/src/test/java/serenitylabs/tutorials/vetclinic/domain/WhenCollectingAnimals.java

Then: WhenVisitingTheClinic.java in vet-clinic repo, branch kata/sla/start https://github.com/serenity-dojo/vet-clinic/blob/ea41d30fd52c7c65d235dca0497c0d917b1fcbb2/src/test/java/serenitylabs/tutorials/vetclinic/domain/WhenVisitingTheClinic.java

Polymorphism using Interface

See test file: WhenVaccinatingAnimals.java in vet-clinic repo, branch kata/sla/start https://github.com/serenity-dojo/vet-clinic/blob/d0db6d841dd1b00fdcc269a4679a5e198281e0e3/src/test/java/serenitylabs/tutorials/vetclinic/domain/WhenVaccinatingAnimals.java

Strategy Pattern

Basic strategy pattern

See test file WhenToldToPlayBall in vet-clinic repo, branch kata/strategy-pattern/ start https://github.com/ashwiniraokarai/vet-clinic/blob/1b3be61e9c5566ae9eb11f15b8a50832b4a8b54d/src/test/java/serenitylabs/tutorials/vetclinic/playingball/WhenToldToPlayBall.java

Strategy pattern with Factories

See the same branch as before kata/strategy-pattern/start with newer commits The new file for Factory Class is FetchGame.java https://github.com/serenity-dojo/vet-clinic/commit/7ac6f5f83b49dcaa4d987f5b5cf4efac34a0da85

Strategy pattern with Functions

See WhenApplyingSalesTax.java https://github.com/ashwiniraokarai/vet-clinic/commits/kata/strategy-pattern/step-4-start See WhenApplyingSalesTaxUsingParameterizedTest.java for parameterized version of this test

Strategy pattern with Lambdas and Functional Interface

See kata/strategy-pattern/step-4-start in vet-clinic repo https://github.com/ashwiniraokarai/vet-clinic/commit/06161d6acbf390725943dd3bbb96b3c8358c435d#diff-3b8a66ebc1b784ab3eb9738c003c41d402ec5aa335a16ae3367972200745427e

Walkthro document https://docs.google.com/document/d/1B24o2XXGGgEr804nR8MfZlX01ZxVWxy0vovqisnT6Og/edit?usp=sharing

Repo originally forked from https://github.com/serenity-dojo/vet-clinic