fix:solution 2

src/restoreNames.test.js

@@ -1,10 +1,48 @@
 'use strict';
 
+const { ExportConflictException } = require('@aws-sdk/client-dynamodb');
+
 describe('restoreNames', () => {
-  // const { restoreNames } = require('./restoreNames');
+  const { restoreNames } = require('./restoreNames');
+
+  it('should set the firstName from fullName when firstName is set as 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')
+  });
 
-  it('should ', () => {
+  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')
   });
 
   // write tests here