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public static Mock<DbSet<T>> GetMockDbSet<T>( IQueryable<T> entities ) where T : class
{
    var mockSet = new Mock<DbSet<T>>();
    mockSet.As<IQueryable<T>>().Setup( m => m.Provider ).Returns( entities.Provider );
    mockSet.As<IQueryable<T>>().Setup( m => m.Expression ).Returns( entities.Expression );
    mockSet.As<IQueryable<T>>().Setup( m => m.ElementType ).Returns( entities.ElementType );
    mockSet.As<IQueryable<T>>().Setup( m => m.GetEnumerator() ).Returns( entities.GetEnumerator );
    return mockSet;
}