To use it, we add the attribute to a test or fixture, and in NUnit 3 and above, we're required to include a reason. In the rare cases that I need to order tests, I just prefix them with a letter, A_Test (), B_Test (), etc. However, when I click "Run All" in the "Test Explorer" in Visual Studio, the test setup for Fixture A is called (it was executed first) and Setup for Fixture B is ignored. This page lays out the translation between NUnit and XUnit (as well as a couple other C#/.NET test frameworks). This prevents important set-up code from running. NUnit will construct a separate instance of the fixture for each TestFixtureAttribute you provide. The examples in this post are specific for NUnit but, you can apply this pattern for safely running unit tests in parallel to any unit test framework that supports parallel execution.. To safely run tests in parallel, do the following: Mark your test fixtures with the Parallelizable attribute and set the parallel scope to ParallelScope.All. It must be a publicly exported type or NUnit will not see it. This makes the constructor a convenient place to put reusable context setup code where you want to share the code without sharing object instances (meaning, you get a clean copy of the context object(s… https://docs.microsoft.com/en-us/dotnet/core/testing/unit-testing-with-nunit (That is why NUnit/xUnit/MSTest all ask you to install a test adapter NuGet package to your unit testing projects). Beginning with NUnit 2.5, TestFixtureSetUp methods may be either static or instance methods and you may define more than one of them in a fixture. The OrderAttribute may be placed on a test method or fixture to specify the order in which tests are run within the fixture or other suite in which they are contained. SetUpFixtureAttribute (NUnit 2.4) This is the attribute that marks a class that contains the one-time setup or teardown methods for all the test fixtures under a given namespace. And we'll open that file and you can see it created a test fixture class with a reference to NUnit and a class inside of it that we can start adding tests to. If multiple threads are in use, a test may be started while some earlier tests are still being run. If we return to the IDE, we'll see that this created a new .cs file. There are a few restrictions on a class that is used as a test fixture. In order for NUnit to instantiate the fixture, you must specify the types to be used as arguments to TestFixtureAttribute, which may now appear multiple times on the class. 3.The attributes of the test level. Generally, you don't want to rely on the order your tests are going to be executed. The class may contain at most one method marked with the SetUpAttribute and one method marked with the TearDownAttribute. From the NUnit website, we got the explanation for SetUpFixture as: Reference start------------------------------------------------------------------------------ Reference end-------------------------------------------------------------------------------------- But what is exactly the "under a given namespace" means? I'm new to Nunit and am trying to run 2 Test Fixtures, A & B.Within each Fixture I have a unique Setup method for each. NUnit also provides the [Ignore] attribute. And to use it you must pass a String that can be parsed into a date. Write maintainable unit tests, faster. To discover or execute test cases, VSTest would call the test adapters based on your project configuration. The class may contain at most one method marked with the SetUpAttribute and one method marked with the TearDownAttribute. And this can be applied to tests, or test fixtures as a whole. 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