SQLite.Interop.dll locked after running Visual Studio 2012 Unit Test Framework tests

• Visual Studio 2012
• SQLite 1.0.82.0 (from nuget)

I am trying to use the "Run All" command in the "Test Explorer" The following error happens after you run the test once ... after that it will not build anymore, until you restart visual studio

Here is the build error

The Process cannot access the file 'SQLite.Interop.dll' because it is being used by another process

here is the code

using System.Data.SQLite;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace Test.Sqlite
{
    [TestClass]
    public class Test_Sqlite_Locking
    {
        [TestMethod]
        public void can_create_table()
        {
            using(var fact = new SQLiteFactory())            
            using (var conn = fact.CreateConnection())
            {
                conn.ConnectionString = "Data Source=:memory:;Version=3;New=True;";
                conn.Open();
                //conn.Close();                
            }

            //SQLiteConnection.ClearAllPools();
            //GC.Collect();
        }
    }
}

I have tried, closing connection, calling ClearAllPools, GC.Collect, and creating the SQLiteConnection directly (instead of the Factory) ... still same issue

This DOES work if you DEBUG ALL TESTS ... but it is when you just Run the tests that this seems to lock it up