Thursday, 27 June 2013

Beginning Unit Testing with NUnit in Visual Studio

How to start with NUnit?

Download it from and install it. It should be installed at C:\Program Files (x86)\NUnit 2.6.2. (2.6.2 is the current release version in the time of writing this article)

How to organise my projects? Where to put unit tests?

Put the business logic of your app in a class library project (e.g. MyBusinessLogic.dll). Your main app (MyApp.exe) project references this dll. Put unit tests in a separate project (e.g. MyBusinessLogicTester.dll) but within the same solution. MyBusinessLogicTester.dll will reference nunit.framework.dll (located at C:\Program Files (x86)\NUnit 2.6.2\bin) and MyBusinessLogic.dll.

How to run NUnit tests?

In MyBusinessLogicTester project: go to Properties -> Debug. Set Start external program to C:\Program Files (x86)\NUnit 2.6.2\bin\nunit.exe and put MyBusinessLogicTester.dll in Command line arguments field.

Set MyBusinessLogicTester as a StartUp project in your solution and run it. Nunit GUI app (nunit.exe) will open and display all test fixtures and tests in the left-hand side tree view. You can select tests you want to run and then execute them.

If you're running MyBusinessLogicTester tests with ReSharper, make sure MyBusinessLogicTester is marked to be built in the Configuration Manager.

Links and References:

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