Are Sesame Street specials and videos tested?

[minor muppetz]

We know that pretty much every Sesame Street episode and segment is researched and tested to kids before airing, but can the same be said about the various teleivison specials, movies, and video/DVD releases?

I guess the more recent specials like Families Stand Together and When Families Grieve would be tested, but what about Sesame Street: 20 and Still Counting, Christmas Eve on Sesame Street, Follow That Bird, Learning About Letters, and The Best of Elmo 2? Or would testing such productions not be as important?

Of course many of the older specials don't focus on one particular topic (unlike most of today's Sesame Street...).