1 files changed, 36 insertions, 0 deletions
diff --git a/lib/ccan/htable/test/run-size.c b/lib/ccan/htable/test/run-size.c
new file mode 100644
index 0000000000..01e4bb41ac
--- /dev/null
+++ b/lib/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();
+}