Tests in generic class without proper TestFixture attribute should be reported as invalid

[Kenneth Xu]

There are two cases that NUnit should report invalid tests but it doesn't:

1) without TestFixtureAttribute
     // forgot [TestFixture(typeof(string))]
     public class GenericTestFixture<T>
     {
         [Test] public void TestOnGenericFixture() {}
     }

2) with inherited TestFixtureAttribute but no type paramter.

     [TestFixture]
     public class ThirdPartyFixture
     {
     }

     // forgot [TestFixture(typeof(string))]
     public class GenericTestFixture<T> : ThirdPartyFixture
     {
         [Test] public void TestOnGenericFixture() {}
     }

See http://groups.google.com/group/nunit-discuss/msg/de708a9c9b0be103

[Charlie Poole (charlie.poole)]

Merged manually, updating to reflect code changes in the trunk.