fix: use jest expect in UTs

* build(deps): bump chai from 4.5.0 to 6.2.0

Bumps [chai](https://github.com/chaijs/chai) from 4.5.0 to 6.2.0.
- [Release notes](https://github.com/chaijs/chai/releases)
- [Changelog](https://github.com/chaijs/chai/blob/main/History.md)
- [Commits](chaijs/chai@v4.5.0...v6.2.0)

---
updated-dependencies:
- dependency-name: chai
  dependency-version: 6.2.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

* use jest expect

* use jest expect

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: kobenguyent <[email protected]>

Author: dependabot[bot]

babel.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+  presets: [
+    ['@babel/preset-env', {targets: {node: 'current'}}],
+    '@babel/preset-typescript',
+  ],
+};

package.json

@@ -22,20 +22,23 @@
   },
   "homepage": "https://github.com/codeceptjs/mailslurp-helper#readme",
   "dependencies": {
-    "chai": "^4.3.4",
     "expect": "^30.2.0",
     "mailslurp-client": "^16.0.0",
     "ts-node": "^10.9.2"
   },
   "devDependencies": {
+    "@babel/core": "^7.28.4",
+    "@babel/preset-env": "^7.28.3",
+    "@babel/preset-typescript": "^7.27.1",
     "@types/jest": "^29.5.14",
+    "babel-jest": "^30.2.0",
     "codeceptjs": "^3.7.3",
     "documentation": "^14.0.3",
     "dotenv": "^17.2.3",
     "jest": "30.2.0",
     "nock": "^14.0.1",
     "semantic-release": "^24.0.0",
-    "ts-jest": "^29.2.6",
+    "ts-jest": "^29.4.4",
     "typescript": "^5.8.2"
   },
   "files": [

tests/index.spec.ts

@@ -1,6 +1,6 @@
 import nock from 'nock';
 require('dotenv').config();
-import { expect } from 'chai';
+import {expect, test} from '@jest/globals';
 import MailSlurp = require("../src");
 import fs from 'fs';
 
@@ -97,10 +97,9 @@ describe('MailSlurp helper', function () {
 
   test('should create an inbox', async () => {
     const mailbox = await I.haveNewMailbox();
-    expect(mailbox.id).to.be.a('string');
-    expect(mailbox.emailAddress).to.be.a('string');
-    expect(mailbox.emailAddress).to.contain('@');
-    expect(mailbox.toString()).to.eql(mailbox.emailAddress);
+    expect(mailbox.id).toBe('123');
+    expect(mailbox.emailAddress).toBe('[email protected]');
+    expect(mailbox.toString()).toEqual(mailbox.emailAddress);
   });
 
   test('should send and receive an email', async () => {
@@ -122,7 +121,7 @@ describe('MailSlurp helper', function () {
       attachments: [ attachmentId ]
     });
     const email = await I.waitForLatestEmail(50);
-    expect(email.body.trim()).to.eql('Testing');
+    expect(email.body.trim()).toEqual('Testing');
     await I.seeInEmailSubject('Hello');
     await I.seeEmailSubjectEquals('Hello Test');
     await I.seeEmailIsFrom(mailbox.emailAddress);
@@ -149,7 +148,7 @@ describe('MailSlurp helper', function () {
     });
 
     // Since the persistent mock returns emailObj, this should work
-    expect(email.body.trim()).to.eql('Testing');
+    expect(email.body.trim()).toEqual('Testing');
     await I.seeInEmailSubject('Hello');
     await I.seeEmailSubjectEquals('Hello Test');
   }, 10000);