[2] Born in Rome, Lazio, Testardi started his professional career at Pescara.
[10] On 31 January 2011, he was about to join Foligno[11] but the deal was not finished in time.
He played for Sampdoria's Primavera team instead as overage player, partnered with Simone Zaza.
[13] Circa January 2015 Testardi was signed by Arezzo.
[15] On 7 August 2019, Testardi joined Eccellenza club Palazzolo.