A method for testing a portable electronic device, said portable electronic device including an acquisition member, a processing unit including a cache memory, a first storage unit, and a display screen, characterized in that said method comprises the following steps: • acquiring (11, 11') a set of parameters including at least one parameter (x) via said acquisition member; • storing (12, 12') said set of parameters in a first area of said first storage unit; • storing (13, 13') said set of parameters in a second area of said first storage unit, said second area being separate from said first area; • generating at least one first image representative of a first set of results including at least one first result, said first set of results being generated by the application, by said processing unit, of a first processing operation based on said set of parameters stored in said first area of said first storage unit; • in a first displaying step, displaying said at least one first image on said display screen for a first predetermined time period; • in a first erasing step, erasing first intermediate results corresponding to calculation steps carried out during said first processing operation, said first intermediate results being erased from said cache memory of said processing unit; • generating at least one second image representative of a second set of results including at least one second result, said second set of results being generated by the application, by said processing unit, of a second processing operation based on said set of parameters stored in said second area of said first storage unit, said first set of results and said second set of results being equal except in the event of loss of integrity of said portable electronic device; and • in a second displaying step, displaying said at least one second image on said display screen for a second predetermined time period. • acquiring (11, 11') a set of parameters including at least one parameter (x) via said acquisition member; • storing (12, 12') said set of parameters in a first area of said first storage unit; • storing (13, 13') said set of parameters in a second area of said first storage unit, said second area being separate from said first area; • generating at least one first image representative of a first set of results including at least one first result, said first set of results being generated by the application, by said processing unit, of a first processing operation based on said set of parameters stored in said first area of said first storage unit; • in a first displaying step, displaying said at least one first image on said display screen for a first predetermined time period; • in a first erasing step, erasing first intermediate results corresponding to calculation steps carried out during said first processing operation, said first intermediate results being erased from said cache memory of said processing unit; • generating at least one second image representative of a second set of results including at least one second result, said second set of results being generated by the application, by said processing unit, of a second processing operation based on said set of parameters stored in said second area of said first storage unit, said first set of results and said second set of results being equal except in the event of loss of integrity of said portable electronic device; and • in a second displaying step, displaying said at least one second image on said display screen for a second predetermined time period.