From 1cb376998094d1fb602c942481b880d8712f81b6 Mon Sep 17 00:00:00 2001
From: Ariane <bittencourt98ari@gmail.com>
Date: Sat, 10 Jan 2026 11:18:23 +0100
Subject: [PATCH] add task solution

---
 src/restoreNames.test.js | 102 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 99 insertions(+), 3 deletions(-)

diff --git a/src/restoreNames.test.js b/src/restoreNames.test.js
index 6310350..c69a34f 100644
--- a/src/restoreNames.test.js
+++ b/src/restoreNames.test.js
@@ -1,11 +1,107 @@
 'use strict';
+/* eslint-disable max-len */
 
 describe('restoreNames', () => {
-  // const { restoreNames } = require('./restoreNames');
+  const { restoreNames } = require('./restoreNames');
 
-  it('should ', () => {
+  it(`should be declared`, () => {
+    expect(restoreNames).toBeInstanceOf(Function);
+  });
+
+  it(`should set correct firstName to users who do not have it`, () => {
+    const users = [
+      {
+        lastName: 'Holy',
+        fullName: 'Jack Holy',
+      },
+      {
+        lastName: 'Adams',
+        fullName: 'Mike Adams',
+      },
+    ];
+
+    restoreNames(users);
+
+    expect(users).toEqual([
+      {
+        firstName: 'Jack',
+        lastName: 'Holy',
+        fullName: 'Jack Holy',
+      },
+      {
+        firstName: 'Mike',
+        lastName: 'Adams',
+        fullName: 'Mike Adams',
+      },
+    ]);
+  });
 
+  it(`should not change anything if user already has a firstName`, () => {
+    const users = [
+      {
+        firstName: 'Jack',
+        lastName: 'Holy',
+        fullName: 'Jack Holy',
+      },
+      {
+        firstName: 'Mike',
+        lastName: 'Adams',
+        fullName: 'Mike Adams',
+      },
+    ];
+
+    restoreNames(users);
+
+    expect(users).toEqual([
+      {
+        firstName: 'Jack',
+        lastName: 'Holy',
+        fullName: 'Jack Holy',
+      },
+      {
+        firstName: 'Mike',
+        lastName: 'Adams',
+        fullName: 'Mike Adams',
+      },
+    ]);
   });
 
-  // write tests here
+  it(`should set correct firstName to users who's firstName is equal to undefined`, () => {
+    const users = [
+      {
+        firstName: undefined,
+        lastName: 'Holy',
+        fullName: 'Jack Holy',
+      },
+      {
+        lastName: 'Adams',
+        fullName: 'Mike Adams',
+      },
+      {
+        firstName: undefined,
+        lastName: 'Smith',
+        fullName: 'Bob Smith',
+      },
+    ];
+
+    restoreNames(users);
+
+    expect(users).toEqual([
+      {
+        firstName: 'Jack',
+        lastName: 'Holy',
+        fullName: 'Jack Holy',
+      },
+      {
+        firstName: 'Mike',
+        lastName: 'Adams',
+        fullName: 'Mike Adams',
+      },
+      {
+        firstName: 'Bob',
+        lastName: 'Smith',
+        fullName: 'Bob Smith',
+      },
+    ]);
+  });
 });