MVVM Using WPF - Part 2

Creating View-Model Unit Tests using NUnit

In the previous post we created a basic MVVM WPF application; in this post we will add a Unit Tests project to the same solution and implement an Unit Test using NUnit.

Your solution explorer should look like this at the end of this tutorial:

Get NUnit Installed

Download the latest installer (This will add the NUnit libraries to the GAC and install the third separate Unit test runner). You can also add it using Nuget if you have that installed.

Some NUnit attributes and to assertions take note of:

• TestFixture (This describes a class instance. You can have multiple instances of a test class executed by referencing them above the class)
• TestCase (This will test a specific piece of logic)
• Equality Asserts (Checks whether the result should match or not )

* I am not using Mock objects in this tutorial but might want to also look into a blog on it here.

Create the Unit Test Project

• Create a new Class Library project and name it with the same name as the WPF project with trailing .Tests (E.g. MVVMExample.Tests). This naming convention is standard for all unit test projects.
• Reference the .NET nunit.framework assembly for the new Class Library
• Rename the Class1.cs to StudentTest.cs define the following class:

 

• Create a Unit test that executes multiple times with different values:

 

• Start NUnit and load the Test assembly (MVVMExample.Tests.dll) from the project bin folder.
• Right Click and select Run (All the tests should pass in this example):

Code for this post is available from GitHub.