Refactored database connection system to use a shared pool per-request

lib/Test.js

@@ -1,9 +1,6 @@
 /* eslint-disable no-empty-function, getter-return */
 'use strict';
 
-// Import user defined modules
-const DatabaseConnectionPool = require('./DatabaseConnectionPool');
-
 /**
  * A class that represents the date of a test
  */
@@ -62,10 +59,14 @@ class Test {
 	 */
 	date;
 
+	#conn;
+
 	/**
 	 * @param {string} testId - The id of the test to fetch
 	 */
-	constructor(testId) {
+	constructor(conn, testId) {
+		this.#conn = conn;
+
 		const sql = `
 			select
 				testId as id,
@@ -79,13 +80,10 @@ class Test {
 		`;
 
 		return (async () => {
-			const conn = await new DatabaseConnectionPool();
-			const record = await conn.runQuery(sql, [
+			const record = await this.#conn.runQuery(sql, [
 				testId,
 			]);
 
-			conn.close();
-
 			if (!record.length)
 				throw new Error('No test found');
 
@@ -107,11 +105,14 @@ class Test {
 	}
 
 	getClass() {
-		return new (require('./Class'))(this.classId);
+		return new (require('./Class'))(this.#conn, this.classId);
 	}
 
 	getTestTemplate() {
-		return new (require('./TestTemplate'))(this.templateId);
+		return new (require('./TestTemplate'))(
+			this.#conn,
+			this.templateId
+		);
 	}
 
 	async hasAccess(u) {