test: Align
Export "connection.tag" for other modules
Emit "connection" event on the application when a socket.io connection is established
Export "connection" and "emitMessage()" on the application
test: Use fake connections instead of simple string literals
test: Define utils.createStubbedBackendConnection() utility
test: Complete test about "connection" event on the application
test: Fix syntax error
test: Prepare stubbed method for internal operations