diff --git a/src/restoreNames.test.js b/src/restoreNames.test.js
index 6310350..33f32e3 100644
--- a/src/restoreNames.test.js
+++ b/src/restoreNames.test.js
@@ -1,11 +1,51 @@
 'use strict';
 
 describe('restoreNames', () => {
-  // const { restoreNames } = require('./restoreNames');
+  const { restoreNames } = require('./restoreNames');
 
-  it('should ', () => {
+  it(`should set the firstName from fullName when firstName is undefined `,
+    () => {
+      const users = [
+        {
+          firstName: undefined,
+          lastName: 'Holy',
+          fullName: 'Jack Holy',
+        },
+      ];
 
+      restoreNames(users);
+
+      expect(users[0].firstName).toBe('Jack');
+    });
+
+  it(`should set the firstName from fullName when firstName
+   is not set as property`,
+  () => {
+    const users = [
+      {
+        lastName: 'Holy',
+        fullName: 'Jack Holy',
+      },
+    ];
+
+    restoreNames(users);
+
+    expect(users[0].firstName).toBe('Jack');
   });
 
-  // write tests here
+  it(`should keep the firstName when firstName has a different
+   value than fullName`,
+  () => {
+    const users = [
+      {
+        firstName: 'Jack',
+        lastName: 'Holy',
+        fullName: 'John Holy',
+      },
+    ];
+
+    restoreNames(users);
+
+    expect(users[0].firstName).toBe('Jack');
+  });
 });