Unit Testing ASP.Net MVC Craig Berntson Mojo Software Worx

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Ego stuff Organizer, Utah Code Camp Author, “Continuous Integration in .Net” Conference & event speaker INETA Community Speaker ComponentOne Community Influencer Columnist, DNC Magazine 17 time Microsoft MVP Chief Software Gardener Mojo Software Worx Salt Lake City

Problem with… if switch for foreach while do…while

Worse than you think In 1976, G.J. Meyers described a 100-line program that had 1018 unique paths. In 1979 he described a much simpler program. It was just a loop and a few IF statements. In most languages, you could write it in 20 lines of code. This program has 100 trillion paths Testing Computer Software, Cem Kaner

How do you test this?

Agenda What we won’t talk about What we’ll talk about TDD Javascript testing Production ready code What we’ll talk about Setup tests Remove database Keep it simple

Demo: Sample Application

Unit test framework MSTest NUnit xUnit Others

Unit test runner MSTest NUnit Resharper NCrunch Others

Demo: Our first test

Default Data access Difficult to test There is no IDbContext Controller Context Entity Framework Difficult to test There is no IDbContext DbContext tightly bound to EF (EntityFramework.dll)

Removing database access Repositories Mocks Dependency Injection

Repositories Easy to test IRepository Extrapolate away from Context Controller Repository Context Entity Framework Easy to test IRepository Extrapolate away from Context

Mocks Controller Repository Mock Allows us to fake the database

Testing vs. runtime Controller Repository Mock Context Entity Framework

How we normally instantiate Class1 Class2 new Class2()

Dependency injection Class1 ClassA IClass2() ClassA : IClass2

Dependency injection Allows for loose coupling Inversion of control (IOC) IOC Container

Demo: Removing Database access

Selectlist ViewBag ViewModel Automapper

Demo: SELECTLIST

Ajax & json AJAX calls into the controller JSON returns result

Demo: ajax & json

Next steps? My blog Art of Unit Testing Udemy.com Katas TDD

Review Arrange – Act – Assert In memory Repositories Mocks Dependency Injection Automapper

Questions? craig@craigberntson.com @craigber www.craigberntson.com/blog