Changed tests description (refs #20133).

tests/test_apt.sh

 #!/bin/bash
-# Check that the installation of an Ubuntu package using APT works.
+# Check that updates can be installed.
 set -e
 
 echo "Testing apt-get install"

tests/test_nginx_conf_valid.sh

 #!/bin/bash
-# Check that the Nginx configuration files are valid.
+# Checks that the webserver configuration has no errors.
 set -e
 
 if ( which nginx >/dev/null ); then

tests/test_nginx_status.py

 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 '''
-Check the Nginx status vhost response.
+Checks that the webserver is running.
 '''
 import os
 import requests

tests/test_nginx_vhosts.py

 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 '''
-This script checks for all enabled vhosts in Nginx conf that:
-* The response status code is 200 or 403.
-* The host is resolved as 127.0.0.1.
-* The Wowza response is correct on /streaming/ (only for mediaserver vhosts).
+Tests that all webserver services (vhosts) are available and reachable.
 '''
 import os
 import re
@@ -12,6 +9,12 @@ import requests
 import socket
 import sys
 
+'''
+This script checks for all enabled vhosts in Nginx conf that:
+* The response status code is 200 or 403.
+* The host is resolved as 127.0.0.1.
+* The Wowza response is correct on /streaming/ (only for mediaserver vhosts).
+'''
 
 # check that Nginx dir exists
 nginx_dir = '/etc/nginx/sites-enabled'

tests/test_ntp.sh

 #!/bin/bash
-# Check that the NTP server is reachable (date synchronization).
+# Check that the time synchronization server is reachable.
 set -e
 
 source /root/envsetup/conf.sh

tests/test_postfix.py

 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 '''
-Check that postfix listen correctly the port 25.
-Postfix is the service which handles email sendings.
+Check that emails can be sent.
 '''
 import os
 import re
@@ -13,6 +12,7 @@ import sys
 if not os.path.exists('/etc/postfix'):
     print('Postfix dir does not exists, test skipped.')
 else:
+    # check that postfix listens the port 25 correctly
     out = subprocess.check_output('netstat -pant | grep \':25\'', shell=True)
     out = out.decode('utf-8') if out else ''
 

tests/test_ubicast_packages_access.py

 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 '''
-Check that the skyreach server is reachable.
+Check that updates server is reachable.
 '''
 import os
 import re