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#include <ccan/tally/tally.c>
#include <ccan/tap/tap.h>
int main(void)
{
int i;
struct tally *tally = tally_new(100);
ssize_t min, max, median;
size_t err;
max = (ssize_t)~(1ULL << (sizeof(max)*CHAR_BIT - 1));
min = (ssize_t)(1ULL << (sizeof(max)*CHAR_BIT - 1));
plan_tests(100*2 + 100*2 + 100*2);
/* Simple median test: should always be around 0. */
for (i = 0; i < 100; i++) {
tally_add(tally, i);
tally_add(tally, -i);
median = tally_approx_median(tally, &err);
ok1(err <= 4);
ok1(median - (ssize_t)err <= 0 && median + (ssize_t)err >= 0);
}
/* Works for big values too... */
for (i = 0; i < 100; i++) {
tally_add(tally, max - i);
tally_add(tally, min + 1 + i);
median = tally_approx_median(tally, &err);
/* Error should be < 100th of max - min. */
ok1(err <= max / 100 * 2);
ok1(median - (ssize_t)err <= 0 && median + (ssize_t)err >= 0);
}
free(tally);
tally = tally_new(10);
for (i = 0; i < 100; i++) {
tally_add(tally, i);
median = tally_approx_median(tally, &err);
ok1(err <= i / 10 + 1);
ok1(median - (ssize_t)err <= i/2
&& median + (ssize_t)err >= i/2);
}
free(tally);
return exit_status();
}
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