I believe it hasn't been revealed. But I do know that it is the only show from Kids WB that is still alive. Which is great.
you can see all the seasons on netflixs
You can watch johnny test onlineat watchjohnnytestonline.com (only in the United States)
Johnny Test - 2005 99 Deeds of Johnny Test Princess Johnny 4-15 was released on: USA: 1 June 2010
Johnny Test - 2005 Johnny's Amazing Race Johnny Test in 3D 4-16 was released on: USA: 15 July 2010
Johnny Test - 2005 Johnny Cakes Johnny Tube 4-21 was released on: USA: 4 October 2010
Johnny Test - 2005 Johnny's Royal Flush Johnny Test's Day Off 4-23 was released on: USA: 18 November 2010
Johnny Test - 2005 Good Ol' Johnny Test Johnny Strikes Back Again 4-26 was released on: USA: 10 January 2011
Johnny Test - 2005 The Johnny Scouts Johnny B-C- 4-2 was released on: USA: 12 November 2009
Johnny Test - 2005 Sleepover at Johnny's Johnny's Got a Wart 4-22 was released on: USA: 25 November 2010
Johnny Test - 2005 My Johnnyguard Tom and Johnny 4-8 was released on: USA: 21 January 2010
Johnny Test - 2005 Johnny's Big Sister Smackdown Johnny vs- Bling Bling 4 4-18 was released on: USA: 12 August 2010
Johnny Test - 2005 Johnny's Cartmageddon 7 Smooth Talkin' Johnny 6-4 was released on: USA: 18 April 2013