Embodiments of the present disclosure provide a system for testing multicore firmware (FW) in a memory system and a method thereof. A test system includes a test device and a storage device including a plurality of flash translation layer (FTL) cores, each FTL core associated with multiple memory blocks. The test device generates test preconditions for the plurality of FTL cores and provides the test preconditions to the plurality of FTL cores, the test preconditions being different from each other. Each of the plurality of FTL cores performs one or more test operations based on a corresponding test precondition of the test preconditions.