1 files changed, 73 insertions, 0 deletions
diff --git a/t/unit-tests/u-string-list.c b/t/unit-tests/u-string-list.c
index d2761e1f2f..f061a3694b 100644
--- a/t/unit-tests/u-string-list.c
+++ b/t/unit-tests/u-string-list.c
@@ -13,6 +13,26 @@ static void t_vcreate_string_list_dup(struct string_list *list,
 		string_list_append(list, arg);
 }
 
+static void t_create_string_list_dup(struct string_list *list, int free_util, ...)
+{
+	va_list ap;
+
+	cl_assert(list->strdup_strings);
+
+	string_list_clear(list, free_util);
+	va_start(ap, free_util);
+	t_vcreate_string_list_dup(list, free_util, ap);
+	va_end(ap);
+}
+
+static void t_string_list_clear(struct string_list *list, int free_util)
+{
+	string_list_clear(list, free_util);
+	cl_assert_equal_p(list->items, NULL);
+	cl_assert_equal_i(list->nr, 0);
+	cl_assert_equal_i(list->alloc, 0);
+}
+
 static void t_string_list_equal(struct string_list *list,
 				struct string_list *expected_strings)
 {
@@ -90,3 +110,56 @@ void test_string_list__split_in_place(void)
 	t_string_list_split_in_place("foo:;:bar:;:", ":;", -1,
 				     "foo", "", "", "bar", "", "", "", NULL);
 }
+
+static int prefix_cb(struct string_list_item *item, void *cb_data)
+{
+	const char *prefix = (const char *)cb_data;
+	return starts_with(item->string, prefix);
+}
+
+static void t_string_list_filter(struct string_list *list, ...)
+{
+	struct string_list expected_strings = STRING_LIST_INIT_DUP;
+	const char *prefix = "y";
+	va_list ap;
+
+	va_start(ap, list);
+	t_vcreate_string_list_dup(&expected_strings, 0, ap);
+	va_end(ap);
+
+	filter_string_list(list, 0, prefix_cb, (void *)prefix);
+	t_string_list_equal(list, &expected_strings);
+
+	string_list_clear(&expected_strings, 0);
+}
+
+void test_string_list__filter(void)
+{
+	struct string_list list = STRING_LIST_INIT_DUP;
+
+	t_create_string_list_dup(&list, 0, NULL);
+	t_string_list_filter(&list, NULL);
+
+	t_create_string_list_dup(&list, 0, "no", NULL);
+	t_string_list_filter(&list, NULL);
+
+	t_create_string_list_dup(&list, 0, "yes", NULL);
+	t_string_list_filter(&list, "yes", NULL);
+
+	t_create_string_list_dup(&list, 0, "no", "yes", NULL);
+	t_string_list_filter(&list, "yes", NULL);
+
+	t_create_string_list_dup(&list, 0, "yes", "no", NULL);
+	t_string_list_filter(&list, "yes", NULL);
+
+	t_create_string_list_dup(&list, 0, "y1", "y2", NULL);
+	t_string_list_filter(&list, "y1", "y2", NULL);
+
+	t_create_string_list_dup(&list, 0, "y2", "y1", NULL);
+	t_string_list_filter(&list, "y2", "y1", NULL);
+
+	t_create_string_list_dup(&list, 0, "x1", "x2", NULL);
+	t_string_list_filter(&list, NULL);
+
+	t_string_list_clear(&list, 0);
+}