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 a set of parameters (X) including at least one parameter (x) via said acquisition member ; • storing said set of parameters (X) in a first area of said first storage unit ; • storing said set of parameters (X) 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 (Y1) including at least one first result (y1), said first set of results (Y1) being generated by the application, by said processing unit , of a first processing operation based on said set of parameters (X) 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 (Y2) including at least one second result (y2), said second set of results (Y2) being generated by the application, by said processing unit , of a second processing operation based on said set of parameters (X) stored in said second area of said first storage unit , said first set of results (Y1) and said second set of results (Y2) 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 a set of parameters (X) including at least one parameter (x) via said acquisition member ; • storing said set of parameters (X) in a first area of said first storage unit ; • storing said set of parameters (X) 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 (Y1) including at least one first result (y1), said first set of results (Y1) being generated by the application, by said processing unit , of a first processing operation based on said set of parameters (X) 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 (Y2) including at least one second result (y2), said second set of results (Y2) being generated by the application, by said processing unit , of a second processing operation based on said set of parameters (X) stored in said second area of said first storage unit , said first set of results (Y1) and said second set of results (Y2) 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. <EOS>