diff --git a/parts/4/blogApp/src/utils.js b/parts/4/blogApp/src/utils.js
index 30f4ac3..44e2d9e 100644
--- a/parts/4/blogApp/src/utils.js
+++ b/parts/4/blogApp/src/utils.js
@@ -10,7 +10,13 @@ const average = (array) => {
   return array.length === 0 ? 0 : array.reduce(reducer, 0) / array.length;
 };
 
+const listHelper = (posts) => {
+  console.log("lol");
+  return 1;
+};
+
 module.exports = {
   reverse,
   average,
+  listHelper,
 };
diff --git a/parts/4/blogApp/tests/listHelper.test.js b/parts/4/blogApp/tests/listHelper.test.js
new file mode 100644
index 0000000..b7b6881
--- /dev/null
+++ b/parts/4/blogApp/tests/listHelper.test.js
@@ -0,0 +1,10 @@
+const { test, describe } = require("node:test");
+const assert = require("node:assert");
+const { listHelper } = require("../src/utils");
+
+test("dummy returns one", () => {
+  const blogs = [];
+
+  const result = listHelper(blogs);
+  assert.strictEqual(result, 1);
+});
diff --git a/parts/4/notes.md b/parts/4/notes.md
index d51aac8..00c170f 100644
--- a/parts/4/notes.md
+++ b/parts/4/notes.md
@@ -1,3 +1,4 @@
 Exercises:
-- [X] 4.1
-- [X] 4.2
+* [X] 4.1
+* [X] 4.2
+* [X] 4.3