1 files changed, 65 insertions, 0 deletions
diff --git a/ccan/list/test/run-list_prev-list_next.c b/ccan/list/test/run-list_prev-list_next.c
new file mode 100644
index 0000000..cc61e03
--- /dev/null
+++ b/ccan/list/test/run-list_prev-list_next.c
@@ -0,0 +1,65 @@
+#include <ccan/list/list.h>
+#include <ccan/tap/tap.h>
+#include <ccan/list/list.c>
+#include "helper.h"
+
+struct parent {
+	const char *name;
+	unsigned int num_children;
+	struct list_head children;
+};
+
+struct child {
+	const char *name;
+	struct list_node list;
+};
+
+int main(void)
+{
+	struct parent parent;
+	struct child c1, c2, c3;
+	const struct parent *p;
+	const struct child *c;
+
+	plan_tests(20);
+	parent.num_children = 0;
+	list_head_init(&parent.children);
+
+	c1.name = "c1";
+	list_add(&parent.children, &c1.list);
+
+	ok1(list_next(&parent.children, &c1, list) == NULL);
+	ok1(list_prev(&parent.children, &c1, list) == NULL);
+
+	c2.name = "c2";
+	list_add_tail(&parent.children, &c2.list);
+
+	ok1(list_next(&parent.children, &c1, list) == &c2);
+	ok1(list_prev(&parent.children, &c1, list) == NULL);
+	ok1(list_next(&parent.children, &c2, list) == NULL);
+	ok1(list_prev(&parent.children, &c2, list) == &c1);
+
+	c3.name = "c3";
+	list_add_tail(&parent.children, &c3.list);
+
+	ok1(list_next(&parent.children, &c1, list) == &c2);
+	ok1(list_prev(&parent.children, &c1, list) == NULL);
+	ok1(list_next(&parent.children, &c2, list) == &c3);
+	ok1(list_prev(&parent.children, &c2, list) == &c1);
+	ok1(list_next(&parent.children, &c3, list) == NULL);
+	ok1(list_prev(&parent.children, &c3, list) == &c2);
+
+	/* Const variants */
+	p = &parent;
+	c = &c2;
+	ok1(list_next(&p->children, &c1, list) == &c2);
+	ok1(list_prev(&p->children, &c1, list) == NULL);
+	ok1(list_next(&p->children, c, list) == &c3);
+	ok1(list_prev(&p->children, c, list) == &c1);
+	ok1(list_next(&parent.children, c, list) == &c3);
+	ok1(list_prev(&parent.children, c, list) == &c1);
+	ok1(list_next(&p->children, &c3, list) == NULL);
+	ok1(list_prev(&p->children, &c3, list) == &c2);
+
+	return exit_status();
+}