TestFixtureAttribute public class TestFixtureAttribute : NUnitAttribute, IFixtureBuilder2, IFixtureBuilder, ITestFixtureData, ITestData Marks the class as a TestFixture. Documentation Code /* Error decompiling System.Collections.Generic.IEnumerable`1 NUnit.Framework.TestFixtureAttribute::BuildFrom(NUnit.Framework.Interfaces.ITypeInfo,NUnit.Framework.Interfaces.IPreFilter) */