app = subprocess.Popen(["./converter", "test/test.img", "output"], stdout=None, stderr=subprocess.PIPE)
    output = app.stderr.read()
    print(output.decode("utf-8"))
    crash = b"*** The program has crashed\n"

    # check if message finish with the crash msg
    if(output[len(output)-len(crash):] == crash):
        print(output.decode("utf-8"))