tests/test-timed-average.c

   1 /*
   2  * Timed average computation tests
   3  *
   4  * Copyright Nodalink, EURL. 2014
   5  *
   6  * Authors:
   7  *  Benoît Canet     <benoit.canet@nodalink.com>
   8  *
   9  * This work is licensed under the terms of the GNU LGPL, version 2 or later.
  10  * See the COPYING.LIB file in the top-level directory.
  11  */
  12
  13 #include <glib.h>
  14 #include <unistd.h>
  15
  16 #include "qemu/timed-average.h"
  17
  18 /* This is the clock for QEMU_CLOCK_VIRTUAL */
  19 static int64_t my_clock_value;
  20
  21 int64_t cpu_get_clock(void)
  22 {
  23     return my_clock_value;
  24 }
  25
  26 static void account(TimedAverage *ta)
  27 {
  28     timed_average_account(ta, 1);
  29     timed_average_account(ta, 5);
  30     timed_average_account(ta, 2);
  31     timed_average_account(ta, 4);
  32     timed_average_account(ta, 3);
  33 }
  34
  35 static void test_average(void)
  36 {
  37     TimedAverage ta;
  38     uint64_t result;
  39     int i;
  40
  41     /* we will compute some average on a period of 1 second */
  42     timed_average_init(&ta, QEMU_CLOCK_VIRTUAL, NANOSECONDS_PER_SECOND);
  43
  44     result = timed_average_min(&ta);
  45     g_assert(result == 0);
  46     result = timed_average_avg(&ta);
  47     g_assert(result == 0);
  48     result = timed_average_max(&ta);
  49     g_assert(result == 0);
  50
  51     for (i = 0; i < 100; i++) {
  52         account(&ta);
  53         result = timed_average_min(&ta);
  54         g_assert(result == 1);
  55         result = timed_average_avg(&ta);
  56         g_assert(result == 3);
  57         result = timed_average_max(&ta);
  58         g_assert(result == 5);
  59         my_clock_value += NANOSECONDS_PER_SECOND / 10;
  60     }
  61
  62     my_clock_value += NANOSECONDS_PER_SECOND * 100;
  63
  64     result = timed_average_min(&ta);
  65     g_assert(result == 0);
  66     result = timed_average_avg(&ta);
  67     g_assert(result == 0);
  68     result = timed_average_max(&ta);
  69     g_assert(result == 0);
  70
  71     for (i = 0; i < 100; i++) {
  72         account(&ta);
  73         result = timed_average_min(&ta);
  74         g_assert(result == 1);
  75         result = timed_average_avg(&ta);
  76         g_assert(result == 3);
  77         result = timed_average_max(&ta);
  78         g_assert(result == 5);
  79         my_clock_value += NANOSECONDS_PER_SECOND / 10;
  80     }
  81 }
  82
  83 int main(int argc, char **argv)
  84 {
  85     /* tests in the same order as the header function declarations */
  86     g_test_init(&argc, &argv, NULL);
  87     g_test_add_func("/timed-average/average", test_average);
  88     return g_test_run();
  89 }
  90