The 26-year-old Testwuide spent the past two seasons with the Fyers' AHL affiliate, the Adirondack Phantoms, where he's amassed 30 goals and 38 assists through 142 games.
The native of Vail, Colorado, was captain of Colorado College (WCHA) during his senior year and led the team in scoring. Following four seasons at Colorado College, he signed as a free agent with the Flyers on March 19, 2010.
Wahl, 23, spent last season playing for the Hamilton Bulldogs and Abbotsford Heat in the AHL, registering 27 goals and two assists in his time between the two clubs.
Wahl signed a three-year entry-level contract with the Flames in 2009 after being drafted by the club in the second round (48th overall) of the 2008 NHL Entry Draft.