The invention relates to a method and apparatus of simulating memory allocation errors in a software application. The method includes: determining a range of memory block sizes in a memory allocation function which results in a memory allocation failure, the range of memory block sizes defined by a first simulation criteria and including all memory block sizes between a minimum threshold and a maximum threshold; initializing an application, and simultaneously executing the memory allocation function; triggering a memory allocation failure if the application requires a memory value within the range of memory block sizes; and varying the range of memory block sizes based on a second simulation criteria, wherein the first simulation criteria and second simulation criteria are determined by a pre-determined range of memory block sizes for a memory failure simulation.