Moqing Entity Framework 6 .Include() using DbSet

For anyone who stumbles upon this issue with interest on how to solve the .Include("Foo") problem with NSubstitute and Entity Framework 6+, I was able to bypass my Include calls in the following way:

var data = new List<Foo>()
{
    /* Stub data */
}.AsQueryable();

var mockSet = Substitute.For<DbSet<Foo>, IQueryable<Foo>>();
((IQueryable<Post>)mockSet).Provider.Returns(data.Provider);
((IQueryable<Post>)mockSet).Expression.Returns(data.Expression);
((IQueryable<Post>)mockSet).ElementType.Returns(data.ElementType);
((IQueryable<Post>)mockSet).GetEnumerator().Returns(data.GetEnumerator());

// The following line bypasses the Include call.
mockSet.Include(Arg.Any<string>()).Returns(mockSet);