ASP.NET Core And EF Core 2.0 Testing

Problem

How to perform unit and integration testing of ASP.NET Core and EF Core.

Solution

The sample code contain a lot more tests, I would suggest you download and play with it. Here I will list a few tests to demonstrate how testing works.

Testing MVC

Add MVC controller with action methods,

Add test to verify ViewResult is returned,

Add test to verify status code result (e.g. NotFound) is returned,

Add test to verify RedirectToAction is returned,

Add a test to verify ModelState errors don’t save and return back the view,

Testing API

Add API controller with action methods,

Add a test to verify OkObjectResult is returned,

Add a test to verify CreatedAtRouteResult is returned,

Testing EF

Add a repository (implementation in sample code),

The repository will work with a DbContext,

Initialize with test data,

Now you could test various methods of repository, e.g. test GetList() method,

Integration Testing

Create a base class for integration test classes,

Create a controller to test MVC/API,

Discussion

The single biggest selling point of MVC architecture in general and ASP.NET Core in particular is that it makes testing much simpler. ASP.NET team has done a great job in making a framework that is pluggable, thus enabling testing of controllers, repositories and even the entire application a breeze.

Unit Testing

Unit Testing ASP.NET Core and API controllers is not that much different than testing any other class in your application. The sample code contain a lot more tests to show examples of type of tests you could perform e.g.,

  • Verify correct IActionResult is returned, e.g. ViewResult, RedirectAtRouteResult
  • Verify correct view name is returned
  • Verify correct model is returned
  • Verify correct HTTP status code is returned e.g. NotFoundResult, BadRequestResult
  • Verify model state behaviour e.g. not saving record and returning the view.
  • Verify controller dependencies are being called.
Testing Entity Framework

You could test EF using in-memory database, you’ll need package Microsoft.EntityFrameworkCore.InMemory that gives you UseInMemoryDatabase extension method on DbContextOptionsBuilder. With these pieces in place you could now create an in-memory DbContext,

Integration Testing

Remember that ASP.NET Core application is just a console application that sets up web server to listen to HTTP requests. We can set up a test web server using TestServer class and use HttpClient to send requests to it,

Source Code

GitHub

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