Add comprehensive tests for role middleware and fix package dependencies

node_modules/mysql2/lib/auth_plugins/index.js

@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports = {
+  caching_sha2_password: require('./caching_sha2_password'),
+  mysql_clear_password: require('./mysql_clear_password'),
+  mysql_native_password: require('./mysql_native_password'),
+  sha256_password: require('./sha256_password'),
+};