Testival Mini Dress - ChelseaA TV test card, also known as a test pattern, is a television test signal, typically broadcast at times when the transmitter is active but no programme is being broadcast (often at startup and closedown). Sleeveless Stretchy dress. Colour printed Fabric. Testival test card design. Halterneck Used since the earliest TV broadcasts, test cards were originally physical cards at which a television camera was pointed, and such cards are still often used for