In this page of ReSharper options, you can adjust unit testing settings related to NUnit tests.
|Enable NUnit support||By default, ReSharper adds action indicators allowing you to execute NUnit tests right from the editor and automatically discovers NUnit tests in your solution. Clear this check box to disable this behavior.|
|Load NUnit Addins||
ReSharper comes bundled with NUnit 2.6.4 test runner, which is used by default unless
If you need to use NUnit addins for this bundled version, put them in the addins subfolder of the ReSharper installation directory (which is shown for your convenience) and choose whether to load them or not, or choose if required
|NUnit 3.0 Beta 4|
|When to use NUnit 3 test runner||
ReSharper installation also includes version 3.0 Beta 4 of the NUnit test runner.
By default, it is only used when
Note that NUnit addins will not be loaded for this test runner.
|Custom NUnit installation|
|Use specified custom NUnit||
If you want to use another NUnit version, tick this check box and enter the path to the local NUnit installation into the corresponding text box.