In the NUnit test framework, which attribute must adorn a test class in order for it to be picked up by the NUnit GUI?

148.

Test Attribute

TestClass Attribute

TestFixture Attribute

NUnitTestClass Attribute

All of above

namespace NUnit.Tests
{
using System;
using NUnit.Framework;

[TestFixture]
public class SuccessTests
{
// ...
}
}