Add tests and detect WhatsApp Web updates (#686)

* test setup, add initializer tests

* test sending messages

* add script to check latest version

* add github action

* use env vars

* configure environment with .env file

* add test for sticker name and author

* add DownloadManager model

* test chats and contacts

* test for number utility functions

* throw error if no remote id has been set

* Update .version

tools/version-checker/update-version

@@ -0,0 +1,55 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const puppeteer = require('puppeteer');
+const { DefaultOptions } = require('../../src/util/Constants');
+
+const getLatestVersion = async () => { 
+    const browser = await puppeteer.launch();
+    const page = await browser.newPage();
+    await page.setUserAgent(DefaultOptions.userAgent);
+
+    await page.goto('https://web.whatsapp.com/', { waitUntil: 'load'});
+    await page.waitForSelector('.landing-header');
+
+    const version = await page.evaluate(() => window.Debug.VERSION);
+    await browser.close();
+
+    return version;
+};
+
+const getCurrentVersion = () => {
+    try {
+        const versionFile = fs.readFileSync('./.version');
+        return versionFile ? versionFile.toString() : null;
+    } catch(_) {
+        return null;
+    }
+};
+
+const updateVersion = async (oldVersion, newVersion) => {
+    const readmePath = '../../README.md';
+  
+    const readme = fs.readFileSync(readmePath);  
+    const newReadme = readme.toString().replaceAll(oldVersion, newVersion);
+
+    fs.writeFileSync(readmePath, newReadme);
+    fs.writeFileSync('./.version', newVersion);
+    
+};
+
+(async () => {
+    const currentVersion = getCurrentVersion();
+    const version = await getLatestVersion();
+
+    console.log(`Current version: ${currentVersion}`);
+    console.log(`Latest version: ${version}`);
+
+    if(currentVersion !== version) {
+        console.log('Updating files...');
+        await updateVersion(currentVersion, version);
+        console.log('Updated!');
+    } else {
+        console.log('No changes.');
+    }
+})();