Using Open Generic Types In TestFixture Attribute Causes Exception When Loading Test DLL

[MrKWatkins]

The following C# test fixture: (built for .NET 3.5 under VS2010 SP1)

[TestFixture(typeof(List<>))]
public sealed class NUnitBug<T>
{
    [Test]
    public void Test()
    {
    }
}

Causes the following exception when loading the tests in the NUnit GUI runner:

System.NullReferenceException...

Server stack trace:
   at NUnit.Core.TypeHelper.GetDisplayName(Type type)
   at NUnit.Core.TypeHelper.GetDisplayName(Type type, Object[] arglist)
   at NUnit.Core.TestSuite..ctor(Type fixtureType, Object[] arguments)
   at NUnit.Core.NUnitTestFixture..ctor(Type fixtureType, Object[] arguments)
   at NUnit.Core.Builders.NUnitTestFixtureBuilder.BuildSingleFixture(Type type, Attribute attr)
   at NUnit.Core.Builders.NUnitTestFixtureBuilder.BuildMultipleFixtures(Type type, Attribute[] attrs)
   at NUnit.Core.Builders.NUnitTestFixtureBuilder.BuildFrom(Type type)
   at NUnit.Core.Extensibility.SuiteBuilderCollection.BuildFrom(Type type)
   at NUnit.Core.TestFixtureBuilder.BuildFrom(Type type)
   at NUnit.Core.Builders.TestAssemblyBuilder.GetFixtures(Assembly assembly, String ns)
   at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, Boolean autoSuites)
   at NUnit.Core.Builders.TestAssemblyBuilder.Build(String assemblyName, String testName, Boolean autoSuites)
   at NUnit.Core.TestSuiteBuilder.BuildSingleAssembly(TestPackage package)
   at NUnit.Core.TestSuiteBuilder.Build(TestPackage package)
   at NUnit.Core.SimpleTestRunner.Load(TestPackage package)
   at NUnit.Core.ProxyTestRunner.Load(TestPackage package)
   at NUnit.Core.ProxyTestRunner.Load(TestPackage package)
   at NUnit.Core.RemoteTestRunner.Load(TestPackage package)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(RuntimeMethodHandle md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at NUnit.Core.TestRunner.Load(TestPackage package)
   at NUnit.Util.TestDomain.Load(TestPackage package)
   at NUnit.Util.TestLoader.LoadTest(String testName)

Tested in NUnit 2.5.10 and 2.6.0 GUI runners and under ReSharper 6.1.

[Charlie Poole (charlie.poole)]

Of course, this can't work, but NUnit should give an error message rather than failing.

[Charlie Poole (charlie.poole)]

Fixed now so it gives an error message when attempting to instantiate a test fixture with an open Type.