test: added test for session id reroll on login

test/authentication.js

@@ -224,6 +224,19 @@ describe('authentication', () => {
 		});
 	});
 
+	it('should regenerate the session identifier on successful login', async () => {
+		const login = util.promisify(helpers.loginUser);
+		const logout = util.promisify(helpers.logoutUser);
+		const matchRegexp = /express\.sid=s%3A(.+?);/;
+
+		const sid = String(jar._jar.store.idx.localhost['/']['express.sid']).match(matchRegexp)[1];
+		await logout(jar);
+		const newJar = await login('regular', 'regularpwd');
+		const newSid = String(newJar._jar.store.idx.localhost['/']['express.sid']).match(matchRegexp)[1];
+
+		assert.notStrictEqual(newSid, sid);
+	});
+
 	it('should revoke all sessions', (done) => {
 		const socketAdmin = require('../src/socket.io/admin');
 		db.sortedSetCard(`uid:${regularUid}:sessions`, (err, count) => {