T8881: dns: expose PowerDNS recursor cache tuning options (#5209)

Add refresh-on-ttl-perc, nothing-below-nxdomain, and minimum-ttl-override
under service dns forwarding with recursor template and smoketest coverage.

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: Daniil Baturin <daniil@baturin.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/smoketest/scripts/cli/test_service_dns_forwarding.py b/smoketest/scripts/cli/test_service_dns_forwarding.py
index ffc0d7734..52134d8c8 100755
--- a/smoketest/scripts/cli/test_service_dns_forwarding.py
+++ b/smoketest/scripts/cli/test_service_dns_forwarding.py
@@ -131,6 +131,28 @@ class TestServicePowerDNS(VyOSUnitTestSHIM.TestCase):
         tmp = get_config_value('local-port')
         self.assertEqual(tmp, '53')
 
+    # PowerDNS cache-related recursor options
+    def test_recursor_cache_options(self):
+        ttl_percent = '10'
+        nothing_below_nxdomain = 'yes'
+        minimum_ttl_override = '30'
+
+        self.cli_set(base_path + ['ttl-percent', ttl_percent])
+        self.cli_set(base_path + ['nothing-below-nxdomain', nothing_below_nxdomain])
+        self.cli_set(base_path + ['minimum-ttl-override', minimum_ttl_override])
+
+        self.cli_commit()
+
+        self.assertEqual(get_config_value('refresh-on-ttl-perc'), ttl_percent)
+        self.assertEqual(get_config_value('nothing-below-nxdomain'), nothing_below_nxdomain)
+        self.assertEqual(get_config_value('minimum-ttl-override'), minimum_ttl_override)
+
+    def test_nothing_below_nxdomain(self):
+        for option in ['no', 'dnssec', 'yes']:
+            self.cli_set(base_path + ['nothing-below-nxdomain', option])
+            self.cli_commit()
+            self.assertEqual(get_config_value('nothing-below-nxdomain'), option)
+
     def test_dnssec(self):
         # DNSSEC option testing
         options = ['off', 'process-no-validate', 'process', 'log-fail', 'validate']