Got rid of WAClient, deprecated code. Prep for V3

Layered classes based on hierarchy as well.

src/Tests/Common.ts

@@ -0,0 +1,28 @@
+import { WAConnection, MessageLogLevel, MessageOptions, MessageType } from '../WAConnection/WAConnection'
+import * as assert from 'assert'
+import fs from 'fs/promises'
+
+require ('dotenv').config () // dotenv to load test jid
+export const testJid = process.env.TEST_JID || '1234@s.whatsapp.net' // set TEST_JID=xyz@s.whatsapp.net in a .env file in the root directory
+
+export async function sendAndRetreiveMessage(conn: WAConnection, content, type: MessageType, options: MessageOptions = {}) {
+    const response = await conn.sendMessage(testJid, content, type, options)
+    const messages = await conn.loadConversation(testJid, 10, null, true)
+    const message = messages.find (m => m.key.id === response.key.id)
+    assert.ok(message)
+    return message
+}
+export function WAConnectionTest(name: string, func: (conn: WAConnection) => void) {
+    describe(name, () => {
+        const conn = new WAConnection()
+        conn.logLevel = MessageLogLevel.info
+
+        before(async () => {
+            const file = './auth_info.json'
+            await conn.connectSlim(file)
+            await fs.writeFile(file, JSON.stringify(conn.base64EncodedAuthInfo(), null, '\t'))
+        })
+        after(() => conn.close())
+        func(conn)
+    })
+}