You mean the pilots of animated shows get viewed by a test audience, and yet many of them *still* get released to the public even though they're terrible, like Velma, Santa Inc, and Fairview???
At least Sesame Street knew better, they once made an episode that was going to be about Mr. Snuffleupagus's parents getting a divorce, but when they showed it to their child test audience the kids believed in the exact opposite in the message they were going for, as in the kids believed that their parents getting divorced was their fault and that their parents still didn't love them. So the episode never aired. But modern Sesame Street does have a character, Abby Cadabby, a fairy godmother in-training whose parents live apart and she has a stepbrother.