tally: new module for tallying numbers.

[ccan] / ccan / tally / test / run-mean.c

diff --git a/ccan/tally/test/run-mean.c b/ccan/tally/test/run-mean.c
new file mode 100644 (file)
index 0000000..a4a67cf
--- /dev/null
+++ b/ccan/tally/test/run-mean.c
@@ -0,0 +1,29 @@
+#include <ccan/tally/tally.c>
+#include <ccan/tap/tap.h>
+
+int main(void)
+{
+       int i;
+       struct tally *tally = tally_new(0);
+       ssize_t min, max;
+
+       max = (ssize_t)~(1ULL << (sizeof(max)*CHAR_BIT - 1));
+       min = (ssize_t)(1ULL << (sizeof(max)*CHAR_BIT - 1));
+
+       plan_tests(100 + 100);
+       /* Simple mean test: should always be 0. */
+       for (i = 0; i < 100; i++) {
+               tally_add(tally, i);
+               tally_add(tally, -i);
+               ok1(tally_mean(tally) == 0);
+       }
+
+       /* Works for big values too... */
+       for (i = 0; i < 100; i++) {
+               tally_add(tally, max - i);
+               tally_add(tally, min + 1 + i);
+               ok1(tally_mean(tally) == 0);
+       }
+
+       return exit_status();
+}