Vad innebär Software Craftmanship? —> Vi är proffs som vill leverera kod vi kan vara stolta över. Varför? Därför att vi vet att det lönar sig i längden. Vi spenderar tex 90% av tiden med att läsa kod, 10% skriva. Implementation Clean Code och TDD är exempel på verktyg som vi kan använda. • Software Craftmanship • Clean code • TDD • Röda tråden • Teststrategier • Design patterns • Magic tricks of testing TDD? http://blog.cleancoder.com/uncle-bob/2016/03/19/GivingUpOnTDD.html Den Röda Tråden KRAV • Vi kan välja utvecklingsmodell DESIGN • Vi kan hantera risk och vet varför behövs IMPLEMENT VISION • Vi kan skriva och estimera krav TEST • User stories, -ilities, regler DRIFTSÄTTN • Vi kan ta fram arkitekturkrav KRAV KRAV … KRAV • Vi kan ta fram arkitektur och design • Vi kan skriva Clean Code TEST TEST … TEST … TEST … KOD KOD KOD KOD … KOD KOD … DEPLOYABLE … DEPLOYABLE SYSTEM
Implementation • Software Craftmanship • Clean code • TDD • Röda tråden • Teststrategier • Design patterns • Magic tricks of testing Testing http://lisacrispin.com/2011/11/08/using-the-agile-testing-quadrants/ Pyramiden Utforskande tester 5% Test Automation Pyramid UI-test (Webtest etc.) 10% Integrationstest 20% Komponenttest 50% Enhetstest 100% http://www.minecraftforum.net/forums/mapping-and-modding/ maps/1503376-insanely-enormous-multiplayer-puzzle-pyramid- v0-8
Test Automation Pyramid http://watirmelon.com/tag/testing-pyramid/ http://www.agilecoachjournal.com/index.php/2014-01-28/testing-2/the-agile- testing-pyramid/attachment/agiletestingpyramid-3/ Testing • Acceptance Testing • UI Testing • Conformance Testing • Configuration Testing • Performance Testing • Load Testing • Stress Testing
Implementation • Software Craftmanship • Clean code • TDD • Röda tråden • Teststrategier • Design patterns • Magic tricks of testing Designprinciper – Coupling and Cohesion – Reveal Intent - Naming – SRP: Single Responsibility Principle – DRY: Don’t Repeat Yourself Design pattern “Each pattern describes a problem that occurs over and over again in our environment, and then describes the core of the solution to that problem...” Christopher Alexander
Problem/Solution/Context/Consequences) Design pattern A pattern is a solution to a problem within a certain context that has a set of predictable consequences . Ted Neward https://dzone.com/articles/reclaiming-design-patterns-20-years-later Software Design Pattern • “a general reusable solution to a commonly occurring problem within a given context” http://en.wikipedia.org/wiki/Software_design_pattern GoF – Creational • Builder, • Factory method, … – Structural • Adapter, Decorator, … – Behavioral • Iterator, Observer, … “workarounds for missing features in C++”?
GoF “Design patterns provide a common vocabulary for designers to use to communicate, document, and explore design alternatives. Design patterns make a system seem less complex by letting you talk about it at a higher level of abstraction than that of a design notation or programming language. Design patterns raise the level at which you design and discuss design with your colleagues.” Creational Design pattern example SRP: Separate usage and creation! - Factory - Builder https://github.com/jonananas/teaching Separate usage from creation, example? Static Factory Method Static Factory Method is not Factory, Factory method or Abstract Factory When: Creation is a bit complex for constructor.’ Then: Create a static method that returns an instance of a class “Static factory method is simply a static method that returns an instance of a class” Effective Java by Joshua Bloch Se also: – http://stackoverflow.com/questions/929021/what-are-static-factory- methods-in-java – http://stackoverflow.com/questions/13029261/design-patterns-factory-vs- factory-method-vs-abstract-factory
Builder When: Creation is a bit complex for constructor, and even static factory method; several input parameters and/or several optionals leading to multiple variations of constructors. Then: Create a fluent interface Builder that takes each parameter one by one and then returns an instance of a class in a single step. – http://en.wikipedia.org/wiki/Builder_pattern Builder – http://en.wikipedia.org/wiki/Builder_pattern Data persistence patterns SRP: Separate usage and persistence! • DAO • CRUD for one entity • Repository • CRUD* for aggregate: entity and it’s abstractions • *Not actually CRUD, but methods reflecting domain
Pattern Language “A pattern language is a method of describing good design practices within a field of expertise” http://en.wikipedia.org/wiki/Pattern_language Tactical DDDesign patterns – DDD Pattern language! https://domainlanguage.com/ddd/patterns/DDD_Reference_2011-01-3 Strategic DDDesign patterns – DDD Pattern language! https://domainlanguage.com/ddd/patterns/DDD_Reference_2011-01-3
Implementation • Software Craftmanship • Clean code • TDD • Röda tråden • Teststrategier • Design patterns • Magic tricks of testing The Magic Tricks of Testing
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