ddclient: T5791: Add smoketest for dynamic interface

smoketest/scripts/cli/test_service_dns_dynamic.py

@@ -292,7 +292,33 @@ def test_06_dyndns_web_options(self):
         self.assertIn(f'password=\'{password}\'', ddclient_conf)
         self.assertIn(f'{hostname}', ddclient_conf)
 
-    def test_07_dyndns_vrf(self):
+    def test_07_dyndns_dynamic_interface(self):
+        # Check if DDNS service can be configured and runs
+        svc_path = name_path + ['namecheap']
+        proto = 'namecheap'
+        dyn_interface = 'pppoe587'
+
+        self.cli_set(svc_path + ['address', dyn_interface])
+        self.cli_set(svc_path + ['protocol', proto])
+        self.cli_set(svc_path + ['server', server])
+        self.cli_set(svc_path + ['username', username])
+        self.cli_set(svc_path + ['password', password])
+        self.cli_set(svc_path + ['host-name', hostname])
+
+        # Dynamic interface will raise a warning but still go through
+        with self.assertRaises(Warning):
+            self.cli_commit()
+
+        # Check the generating config parameters
+        ddclient_conf = cmd(f'sudo cat {DDCLIENT_CONF}')
+        self.assertIn(f'ifv4={dyn_interface}', ddclient_conf)
+        self.assertIn(f'protocol={proto}', ddclient_conf)
+        self.assertIn(f'server={server}', ddclient_conf)
+        self.assertIn(f'login={username}', ddclient_conf)
+        self.assertIn(f'password=\'{password}\'', ddclient_conf)
+        self.assertIn(f'{hostname}', ddclient_conf)
+
+    def test_08_dyndns_vrf(self):
         # Table number randomized, but should be within range 100-65535
         vrf_table = '58710'
         vrf_name = f'vyos-test-{vrf_table}'