test-network: wait a while for addresses to be dropped

Hopefully fixes the following failure:
```
======================================================================
FAIL: test_ipv6_token_prefixstable (__main__.NetworkdRATests.test_ipv6_token_prefixstable)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/systemd/tests/testdata/test-network/systemd-networkd-tests.py", line 5705, in test_ipv6_token_prefixstable
    self.assertNotIn('2002:da8:1:0:b47e:7975:fc7a:7d6e/64', output) # the 1st prefixstable
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '2002:da8:1:0:b47e:7975:fc7a:7d6e/64' unexpectedly found in
  '19: veth99@veth-peer: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000\n
       inet6 2002:da8:1:0:b47e:7975:fc7a:7d6e/64 scope global tentative dynamic mngtmpaddr noprefixroute \n
          valid_lft 2100sec preferred_lft 1000sec\n
       inet6 2002:da8:1:0:da5d:e50a:43fd:5d0f/64 scope global dynamic mngtmpaddr noprefixroute \n
          valid_lft 2100sec preferred_lft 1000sec\n
       inet6 fe80::1034:56ff:fe78:9abc/64 scope link proto kernel_ll \n
          valid_lft forever preferred_lft forever'
----------------------------------------------------------------------
```

diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index 848c8eb4bfe673cd8e594ec17033f46b1d832708..92cb07f11c4b13cca36d253c4c171b416b62165a 100755 (executable)
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -5699,23 +5699,17 @@ class NetworkdRATests(unittest.TestCase, Utilities):
 
         networkctl_reconfigure('veth99')
         self.wait_online('veth99:routable')
-
-        output = check_output('ip -6 address show dev veth99')
-        print(output)
-        self.assertNotIn('2002:da8:1:0:b47e:7975:fc7a:7d6e/64', output) # the 1st prefixstable
-        self.assertIn('2002:da8:1:0:da5d:e50a:43fd:5d0f/64', output) # the 2nd prefixstable
+        self.wait_address('veth99', '2002:da8:1:0:da5d:e50a:43fd:5d0f/64', ipv='-6', timeout_sec=10) # the 2nd prefixstable
+        self.wait_address_dropped('veth99', '2002:da8:1:0:b47e:7975:fc7a:7d6e/64', ipv='-6', timeout_sec=10) # the 1st prefixstable
 
         check_output('ip address del 2002:da8:1:0:da5d:e50a:43fd:5d0f/64 dev veth99')
         check_output('ip address add 2002:da8:1:0:da5d:e50a:43fd:5d0f/64 dev veth-peer nodad')
 
         networkctl_reconfigure('veth99')
         self.wait_online('veth99:routable')
-
-        output = check_output('ip -6 address show dev veth99')
-        print(output)
-        self.assertNotIn('2002:da8:1:0:b47e:7975:fc7a:7d6e/64', output) # the 1st prefixstable
-        self.assertNotIn('2002:da8:1:0:da5d:e50a:43fd:5d0f/64', output) # the 2nd prefixstable
-        self.assertIn('2002:da8:1:0:c7e4:77ec:eb31:1b0d/64', output) # the 3rd prefixstable
+        self.wait_address('veth99', '2002:da8:1:0:c7e4:77ec:eb31:1b0d/64', ipv='-6', timeout_sec=10) # the 3rd prefixstable
+        self.wait_address_dropped('veth99', '2002:da8:1:0:da5d:e50a:43fd:5d0f/64', ipv='-6', timeout_sec=10) # the 2nd prefixstable
+        self.wait_address_dropped('veth99', '2002:da8:1:0:b47e:7975:fc7a:7d6e/64', ipv='-6', timeout_sec=10) # the 1st prefixstable
 
     def test_ipv6_token_prefixstable_without_address(self):
         copy_network_unit('25-veth.netdev', '25-ipv6-prefix.network', '25-ipv6-prefix-veth-token-prefixstable-without-address.network')