htable: start empty.

[ccan] / ccan / htable / test / run-size.c

diff --git a/ccan/htable/test/run-size.c b/ccan/htable/test/run-size.c
new file mode 100644 (file)
index 0000000..01e4bb4
--- /dev/null
+++ b/ccan/htable/test/run-size.c
@@ -0,0 +1,36 @@
+#include <ccan/htable/htable.h>
+#include <ccan/htable/htable.c>
+#include <ccan/tap/tap.h>
+#include <stdbool.h>
+#include <string.h>
+
+#define NUM_VALS 512
+
+/* We use the number divided by two as the hash (for lots of
+   collisions). */
+static size_t hash(const void *elem, void *unused)
+{
+       size_t h = *(uint64_t *)elem / 2;
+       return h;
+}
+
+int main(int argc, char *argv[])
+{
+       struct htable *ht;
+       uint64_t val[NUM_VALS];
+       unsigned int i;
+
+       plan_tests((NUM_VALS) * 2);
+       for (i = 0; i < NUM_VALS; i++)
+               val[i] = i;
+
+       ht = htable_new(hash, NULL);
+       for (i = 0; i < NUM_VALS; i++) {
+               ok1(ht->max >= i);
+               ok1(ht->max <= i * 2);
+               htable_add(ht, hash(&val[i], NULL), &val[i]);
+       }
+       htable_free(ht);
+
+       return exit_status();
+}