Fixed UP032 (f-string): Use f-string instead of format call

tests/fail2ban.py

@@ -152,7 +152,7 @@ def restart_fail2ban_service(final=False):
 	if not final:
 		# Stop recidive jails during testing.
 		command += " && sudo fail2ban-client stop recidive"
-	os.system('{} "{}"'.format(ssh_command, command))
+	os.system(f'{ssh_command} "{command}"')
 
 def testfunc_runner(i, testfunc, *args):
 	print(i+1, end=" ", flush=True)

tests/test_dns.py

@@ -98,7 +98,7 @@ else:
 		# And if that's OK, also check reverse DNS (the PTR record).
 		if not test_ptr("8.8.8.8", "Google Public DNS (Reverse DNS)"):
 			print ()
-			print ("The reverse DNS for {} is not correct. Consult your ISP for how to set the reverse DNS (also called the PTR record) for {} to {}.".format(hostname, hostname, ipaddr))
+			print (f"The reverse DNS for {hostname} is not correct. Consult your ISP for how to set the reverse DNS (also called the PTR record) for {hostname} to {ipaddr}.")
 			sys.exit(1)
 		else:
 			print ("And the reverse DNS for the domain is correct.")

tests/test_smtp_server.py

@@ -6,11 +6,11 @@ if len(sys.argv) < 3:
         sys.exit(1)
 
 host, toaddr, fromaddr = sys.argv[1:4]
-msg = """From: {}
-To: {}
+msg = f"""From: {fromaddr}
+To: {toaddr}
 Subject: SMTP server test
 
-This is a test message.""".format(fromaddr, toaddr)
+This is a test message."""
 
 server = smtplib.SMTP(host, 25)
 server.set_debuglevel(1)