I'm attempting to set up some NUnit tests for the SQL Server Data Providers in my project.  I followed the instructions from NUnit for configuring tests and have my unit tests being compiled into their own assembly.  In the same directory where all of the files are compiled are the DotNetNuke assemblies.  Additionally, I have a configuration file, caled <My AssemblyName>.dll.config, which NUnit is pointed to (from the project editor in configuration properties).  When I try to run my unit tests I'm getting this error:

UnitTests.TestDataProvider.TestAdd:
System.TypeInitializationException : The type initializer for 'DataTier.Removed.DataProvider' threw an exception.
  ----> System.TypeInitializationException : The type initializer for 'DotNetNuke.Services.Cache.CachingProvider' threw an exception.
  ----> System.ArgumentNullException : Value cannot be null.
Parameter name: type

I'm getting this error at this line in my data provider:

private ProviderConfiguration _providerConfiguration = ProviderConfiguration.GetProviderConfiguration("data");

Does anyone have any experience with this error or writing NUnit tests for DotNetNuke data providers?  I haven't found much information about how to do this, though I would imagine it'd be fairly common.

Thanks!

Jason