Writing Testable Code in SharePoint

Tim McCarthySenior Technical Architect

Perficient

Agenda

• Introduction• Repository Pattern• IoC and Dependency Injection Patterns• Model View Presenter Pattern• Unit Testing strategies• Summary

Introduction

• Tightly-coupled SharePoint Code• Difficult to test Web Parts and Pages• Need a better way to organize the code• The answer: Design Patterns!

What is the Repository Pattern?

• Isolates the domain model from data access• Encapsulates the domain object persistence• Persistence Ignorance is bliss!• Works well when used with interfaces…

DemoRepository Pattern

What is IoC?

• Inversion of Control• Depend upon abstract types, not concrete

types

Benefits of Inversion of Control

• Can swap out implementations later (such as different repositories)

• Allows parts of the application to be built independently with no complicated dependencies

• Can work in ASP.NET and switch over to SharePoint later

What is DI?

• DI = Dependency Injection• One solution to the problem instantiating

abstract types• Available DI frameworks– Castle– Unity– MEF– Etc.

Benefits of Dependency Injection

• Can write more granular unit tests• Don’t need to hit the database for testing UI

logic• Allows parts of an application to be easily

swapped out without re-compiling• Using a DI framework makes it almost

seamless!

DemoIoC and Dependency Injection

Model View Presenter Pattern

• Gets the logic out of your UI so it can be tested!

• Forced separation of concerns• Can enable UI logic to be shared• Side Point: Why not use MVC in SharePoint?

DemoModel View Presenter

Unit Testing Strategies

• Test the presenters separately• Use mock views and mock repositories when

testing the presenters• Test the concrete repositories separately

DemoUnit Tests

Summary

• Design Patterns are the key to better SharePoint code!

• Repository, IoC and DI patterns make testing way easier

• MVP pattern gets the logic out of your UI code

Get the Source Code!

Source Code Link

Contact Info

Tim McCarthytim.mccarthy@perficient.com

We want your feedback!Use this QR code or visit:http://sps.la/feedback

Silver Sponsors:

Victory Lap- social event "SharePoint Victory Lap" Social Event for

SPSLA will be at: 5:30pm to 8pm at Di Piazzas (5205 E. Pacific Coast Hwy, 90804)