example: revamp example and add options for unit tests

Example/example.ts

@@ -42,6 +42,10 @@ const question = (text: string) => new Promise<string>((resolve) => rl.question(
 // start a connection
 const startSock = async() => {
 	const { state, saveCreds } = await useMultiFileAuthState('baileys_auth_info')
+	// NOTE: For unit testing purposes only
+	if (process.env.ADV_SECRET_KEY) {
+		state.creds.advSecretKey = process.env.ADV_SECRET_KEY
+	}
 	// fetch latest version of WA Web
 	const { version, isLatest } = await fetchLatestBaileysVersion()
 	console.log(`using WA v${version.join('.')}, isLatest: ${isLatest}`)
@@ -64,27 +68,6 @@ const startSock = async() => {
 		getMessage
 	})
 
-
-	// Pairing code for Web clients
-	if (usePairingCode && !sock.authState.creds.registered) {
-		// todo move to QR event
-		const phoneNumber = await question('Please enter your phone number:\n')
-		const code = await sock.requestPairingCode(phoneNumber)
-		console.log(`Pairing code: ${code}`)
-	}
-
-	const sendMessageWTyping = async(msg: AnyMessageContent, jid: string) => {
-		await sock.presenceSubscribe(jid)
-		await delay(500)
-
-		await sock.sendPresenceUpdate('composing', jid)
-		await delay(2000)
-
-		await sock.sendPresenceUpdate('paused', jid)
-
-		await sock.sendMessage(jid, msg)
-	}
-
 	// the process function lets you process all events that just occurred
 	// efficiently in a batch
 	sock.ev.process(
@@ -94,7 +77,7 @@ const startSock = async() => {
 			// maybe it closed, or we received all offline message or connection opened
 			if(events['connection.update']) {
 				const update = events['connection.update']
-				const { connection, lastDisconnect } = update
+				const { connection, lastDisconnect, qr } = update
 				if(connection === 'close') {
 					// reconnect if not logged out
 					if((lastDisconnect?.error as Boom)?.output?.statusCode !== DisconnectReason.loggedOut) {
@@ -103,6 +86,16 @@ const startSock = async() => {
 						console.log('Connection closed. You are logged out.')
 					}
 				}
+
+				if (qr) {
+					// Pairing code for Web clients
+					if (usePairingCode && !sock.authState.creds.registered) {
+						const phoneNumber = await question('Please enter your phone number:\n')
+						const code = await sock.requestPairingCode(phoneNumber)
+						console.log(`Pairing code: ${code}`)
+					}
+				}
+
 				console.log('connection update', update)
 			}