diff --git a/src/restoreNames.test.js b/src/restoreNames.test.js
index 6310350..01656c1 100644
--- a/src/restoreNames.test.js
+++ b/src/restoreNames.test.js
@@ -1,11 +1,50 @@
-'use strict';
+"use strict";
 
-describe('restoreNames', () => {
-  // const { restoreNames } = require('./restoreNames');
+describe("restoreNames", () => {
+  const { restoreNames } = require("./restoreNames");
 
-  it('should ', () => {
+  it("shouldn't return a value", () => {
+    const result = restoreNames([
+      {
+        firstName: "Jack",
+        lastName: "Holy",
+        fullName: "Jack Holy",
+      },
+      {
+        firstName: "Mike",
+        lastName: "Adams",
+        fullName: "Mike Adams",
+      },
+    ]);
 
+    expect(result).toBeUndefined();
   });
 
-  // write tests here
+  it(`should restore 'firstName'`, () => {
+    const users = [
+      {
+        firstName: undefined,
+        lastName: "Holy",
+        fullName: "Jack Holy",
+      },
+      {
+        lastName: "Adams",
+        fullName: "Mike Adams",
+      },
+    ];
+    restoreNames(users);
+
+    expect(users).toEqual([
+      {
+        firstName: "Jack",
+        lastName: "Holy",
+        fullName: "Jack Holy",
+      },
+      {
+        lastName: "Adams",
+        fullName: "Mike Adams",
+        firstName: "Mike",
+      },
+    ]);
+  });
 });