diff --git a/ren/str.test.ts b/ren/str.test.ts
index 2d0617e..8fc7613 100644
--- a/ren/str.test.ts
+++ b/ren/str.test.ts
@@ -144,3 +144,43 @@ Deno.test({
assertEquals(res, "");
},
});
+
+Deno.test({
+ name: "should change attr key",
+ fn: () => {
+ const layout = E("a", {
+ target: "_blank",
+ href: "/hello/world",
+ rel: "nofollow noopener",
+ }, "hello world");
+
+ const ren = new StrRenderer({
+ onVisitAttr: ([key, val]) => [`data-${key}`, val],
+ });
+ const res = ren.render(layout);
+
+ assertEquals(
+ res,
+ 'hello world',
+ );
+ },
+});
+
+Deno.test({
+ name: "should change attr value",
+ fn: () => {
+ const layout = E("a", {
+ href: "/hello/world",
+ }, "hello world");
+
+ const ren = new StrRenderer({
+ onVisitAttr: ([key, val]) => [key, "/eng" + val],
+ });
+ const res = ren.render(layout);
+
+ assertEquals(
+ res,
+ 'hello world',
+ );
+ },
+});