Unit Testing ASP.Net MVC Craig Berntson Mojo Software Worx

Ego stuff  Chief Software Gardener Mojo Software Worx Salt Lake City  Author, “Continuous Integration in.Net”  Columnist, “.Net Curry” eMagazine  Conference & event speaker  INETA Community Speaker  ComponentOne Community Influencer  Chief Software Gardener Mojo Software Worx Salt Lake City  Author, “Continuous Integration in.Net”  Columnist, “.Net Curry” eMagazine  Conference & event speaker  INETA Community Speaker  ComponentOne Community Influencer

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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 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  In 1976, G.J. Meyers described a 100-line program that had 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? 6

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

Demo: Sample Application 8

Unit test framework  MSTest  NUnit  xUnit  Others  MSTest  NUnit  xUnit  Others

Unit test runner  MSTest  NUnit  Resharper  NCrunch  Others  MSTest  NUnit  Resharper  NCrunch  Others

Demo: Our first test 11

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

Removing database access 1.Repositories 2.Mocks 3.Dependency Injection 1.Repositories 2.Mocks 3.Dependency Injection

Repositories  Easy to test  IRepository  Extrapolate away from Context  Easy to test  IRepository  Extrapolate away from Context ControllerRepositoryContext Entity Framework

Mocks  Allows us to fake the database ControllerRepositoryMock

Testing vs. runtime ControllerRepositoryMock Context Entity Framework

Class2 How we normally instantiate Class1 new Class2()

ClassA Dependency injection Class1 IClass2() ClassA : IClass2

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

Ajax & json  AJAX calls into the controller  JSON returns result  AJAX calls into the controller  JSON returns result

Demo: ajax & json 21

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

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

Questions?     24