Create tests (#15)

Created a tests folder which contains pytest and bats tests.
Pytest is used to login and send messages to other accounts.
Bats is used to check the log for debug messages.

This fixes #13.

tests/docker-compose.yml

@@ -0,0 +1,24 @@
+version: '3.7'
+
+services:
+  prosody:
+    image: prosody
+    restart: unless-stopped
+    ports:
+      - "5000:5000"
+      - "5222:5222"
+      - "5223:5223"
+      - "5269:5269"
+      - "5281:5281"
+    environment:
+      DOMAIN: localhost
+      E2E_POLICY_WHITELIST: "admin@localhost, user1@localhost"
+      LOG_LEVEL: debug
+      PROSODY_ADMINS: "admin@localhost, admin2@localhost"
+    extra_hosts:
+      - "conference.localhost:127.0.0.1"
+      - "pubsub.localhost:127.0.0.1"
+      - "proxy.localhost:127.0.0.1"
+      - "upload.localhost:127.0.0.1"
+    volumes:
+      - ./certs:/usr/local/etc/prosody/certs