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unit tests behaviours and expected results
==========================================

  00-19: leak tests
  20-39: invalid address
  40-59: memory corruption
  60-79: memory overlap

                  success                                  fail
    ------------------------------------   ------------------------------------
    
00  malloc                                 malloc
    free                                   exit
    exit                                   ** memory leak **

01  calloc                                 calloc
    free                                   exit
    exit                                   ** memory leak **

02  realloc: null                          realloc: null
    free                                   exit
    exit                                   ** memory leak **

03  realloc: null                          realloc: null
    realloc: ret                           realloc: ret
    free: ret                              exit
    exit                                   ** memory leak **

04  strdup                                 strdup
    free                                   exit
    exit                                   ** memory leak **

05  strndup                                strndup
    free                                   exit
    exit                                   ** memory leak **

06  asprintf                               asprintf
    free                                   exit
    exit                                   ** memory leak **

20  malloc                                 free
    free                                   ** invalid address **
    exit

21  realloc: null                          realloc: null
    realloc: ret                           realloc: ret + 10
    free: ret                              ** invalid address **
    exit

40  rc = malloc: 1024                      rc = malloc: 1024
    memset: rc, 0, 1024                    memset: rc, 0, 1025
    free: rc                               free: rc
    exit                                   ** memory corruption **

41  rc = malloc: 1024                      rc = malloc: 1024
    memset: rc, 0, 1024                    memset: rc - 10, 0, 1024
    free: rc                               free: rc
    exit                                   ** memory corruption **

42  rc = malloc: 1024                      rc = malloc: 1024
    memset: rc, 0, 1024                    memset: rc - 10, 0, 1044
    free: rc                               free: rc
    exit                                   ** memory corruption **

43  rc = malloc: 1024                      rc = malloc: 1024
    memset: rc, 0, 1024                    memset: rc, 0, 1025
    sleep: 3                               sleep: 3
    free: rc                               ** memory corruption **
    exit                                   

44  rc = malloc: 1024                      rc = malloc: 1024
    memset: rc, 0, 1024                    memset: rc - 10, 0, 1024
    sleep: 3                               sleep: 3
    free: rc                               ** memory corruption **
    exit                                   

45  rc = malloc: 1024                      rc = malloc: 1024
    memset: rc, 0, 1024                    memset: rc - 10, 0, 1044
    sleep: 3                               sleep: 3
    free: rc                               ** memory corruption **
    exit                                   

60  rc = malloc: 1024                      rc = malloc: 1024
    memmove: rc, rc + 10, 100              memcpy: rc, rc + 10, 100
    free: rc                               ** memory overlap **
    exit