Replace expect.js with node:assert/strict

expect.js is unmaintained and unnecessary — Node's built-in assert
module covers all our assertion patterns. This also removes expect.js
from package.json dependencies.

Made-with: Cursor

test/test.js

@@ -8,7 +8,7 @@
 require('chromedriver');
 
 const execSync = require('child_process').execSync,
-    expect = require('expect.js'),
+    assert = require('node:assert/strict'),
     fs = require('fs'),
     path = require('path'),
     timers = require('timers/promises'),
@@ -50,7 +50,7 @@ describe('Application life cycle test', function () {
 
         const currentUrl = await browser.getCurrentUrl();
         if (!currentUrl.includes(app.domain)) return;
-        expect(this.currentTest.title).to.be.a('string');
+        assert.strictEqual(typeof this.currentTest.title, 'string');
 
         const screenshotData = await browser.takeScreenshot();
         fs.writeFileSync(`./screenshots/${new Date().getTime()}-${this.currentTest.title.replaceAll(' ', '_')}.png`, screenshotData, 'base64');
@@ -59,7 +59,7 @@ describe('Application life cycle test', function () {
     function getAppInfo() {
         const inspect = JSON.parse(execSync('cloudron inspect'));
         app = inspect.apps.filter(function (a) { return a.location.indexOf(LOCATION) === 0; })[0];
-        expect(app).to.be.an('object');
+        assert.ok(app && typeof app === 'object');
     }
 
     async function waitForElement(elem) {