tests/functional/test_vnc: Do not use a hard-coded VNC port

Two tests here are using the hard-coded VNC port :0 ... if there
is already a QEMU or other program running that is using this
port, the tests will be failing. Fortunately, QEMU can also
auto-detect a free port with the "to=..." parameter, so let's
use that for the tests to avoid the problem.

Message-ID: <[email protected]>
Signed-off-by: Thomas Huth <[email protected]>

Author: huth

tests/functional/test_vnc.py

@@ -72,7 +72,7 @@ def test_no_vnc_change_password(self):
                          'Could not set password')
 
     def test_change_password_requires_a_password(self):
-        self.vm.add_args('-nodefaults', '-S', '-vnc', ':0')
+        self.vm.add_args('-nodefaults', '-S', '-vnc', ':1,to=999')
         self.vm.launch()
         self.assertTrue(self.vm.qmp('query-vnc')['return']['enabled'])
         set_password_response = self.vm.qmp('change-vnc-password',
@@ -84,7 +84,7 @@ def test_change_password_requires_a_password(self):
                          'Could not set password')
 
     def test_change_password(self):
-        self.vm.add_args('-nodefaults', '-S', '-vnc', ':0,password=on')
+        self.vm.add_args('-nodefaults', '-S', '-vnc', ':1,to=999,password=on')
         self.vm.launch()
         self.assertTrue(self.vm.qmp('query-vnc')['return']['enabled'])
         self.vm.cmd('change-vnc-password',