tests: ethernets: Add ipv6-address-generation integration tests

These tests validate the Stable Privacy and Modified EUI-64 IPv6 address
generation methods under both NetworkManager and systemd-networkd.

tests/integration/ethernets.py

@@ -221,6 +221,42 @@ def test_ip6_token(self):
         self.generate_and_settle([self.state(self.dev_e_client, '::42')])
         self.assert_iface_up(self.dev_e_client, ['inet6 2600::42/64'])
 
+    def test_ip6_stable_privacy(self):
+        self.setup_eth('ra-only')
+        with open(self.config, 'w') as f:
+            f.write('''network:
+  version: 2
+  renderer: %(r)s
+  ethernets:
+    %(ec)s:
+      dhcp6: yes
+      accept-ra: yes
+      ipv6-address-generation: stable-privacy''' % {'r': self.backend, 'ec': self.dev_e_client})
+        self.generate_and_settle([self.state_dhcp6(self.dev_e_client)])
+        mac_addr = self.dev_e_client_mac.split(':')
+        mac_addr[0] = format(int(mac_addr[0], base=16) ^ 2, 'x')
+        mac_addr[3:3] = ['ff', 'fe']
+        eui_pairs = [''.join(o) for o in zip(*[iter(mac_addr)] * 2)]
+        self.assert_iface_up(self.dev_e_client, ['inet6 2600::'], [f'inet6 2600::{":".join(eui_pairs)}/64'])
+
+    def test_ip6_eui64(self):
+        self.setup_eth('ra-only')
+        with open(self.config, 'w') as f:
+            f.write('''network:
+  version: 2
+  renderer: %(r)s
+  ethernets:
+    %(ec)s:
+      dhcp6: yes
+      accept-ra: yes
+      ipv6-address-generation: eui64''' % {'r': self.backend, 'ec': self.dev_e_client})
+        self.generate_and_settle([self.state_dhcp6(self.dev_e_client)])
+        mac_addr = self.dev_e_client_mac.split(':')
+        mac_addr[0] = format(int(mac_addr[0], base=16) ^ 2, 'x')
+        mac_addr[3:3] = ['ff', 'fe']
+        eui_pairs = [''.join(o) for o in zip(*[iter(mac_addr)] * 2)]
+        self.assert_iface_up(self.dev_e_client, [f'inet6 2600::{":".join(eui_pairs)}/64'])
+
     def test_link_local_all(self):
         self.setup_eth(None)
         with open(self.config, 'w') as f: