NUnitTestFixtureBuilder
NUnitTestFixtureBuilder is able to build a fixture given
            a class marked with a TestFixtureAttribute or an unmarked
            class containing test methods. In the first case, it is
            called by the attribute and in the second directly by
            NUnitSuiteBuilder.
            
                
public NUnitTestFixtureBuilder()
Build a TestFixture from type provided. A non-null TestSuite
            must always be returned, since the method is generally called
            because the user has marked the target class as a fixture.
            If something prevents the fixture from being used, it should
            be returned nonetheless, labeled as non-runnable.
            
Overload of BuildFrom called by tests that have arguments.
            Builds a fixture using the provided type and information
            in the ITestFixtureData object.