feat: #8550, add upgrade script test

flush test db after tests are complete

test/mocks/databasemock.js

@@ -105,6 +105,10 @@ winston.info('environment ' + global.env);
 const db = require('../../src/database');
 module.exports = db;
 
+after(async function () {
+	await db.flushdb();
+});
+
 before(async function () {
 	this.timeout(30000);
 	await db.init();

test/upgrade.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const assert = require('assert');
+
+const db = require('./mocks/databasemock');
+const upgrade = require('../src/upgrade');
+
+describe('Upgrade', function () {
+	it('should get all upgrade scripts', async function () {
+		const files = await upgrade.getAll();
+		assert(Array.isArray(files) && files.length > 0);
+	});
+});