Rate me: Please Sign up or sign in to vote. None: No tests can run in parallel; Self: This level can run in … TestClassAttribute and TestMethodAttribute are features of MS Test. It must be a publicly exported type or NUnit will not see it. An essential part of every UI test framework is the use of a unit testing framework. I also get the same behavior when running all tests via command line. // A SetUpFixture outside of any namespace provides SetUp and TearDown for the entire assembly. Add comment. It will not run if the OneTimeSetUp method fails or throws an exception. Here is the info from NUnit help: http://www.nunit.org/index.php?p=setupFixture&r=2.4.3. If I change the package reference to: