feat: japan node ranking and leftover route detection

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_nodes.py

@@ -0,0 +1,40 @@
+import unittest
+
+from mudfish_decky.nodes import japan_nodes, pick_auto, rtts_from_response
+
+STATIC = [
+    {"sid": 9, "location": "JP Asia (Tokyo - Linode3 IDC)"},
+    {"sid": 11, "location": "JP Asia (Osaka - SakuraNet 4)"},
+    {"sid": 46, "location": "JP Asia (Hokkaido - SakuraNet 6)"},
+    {"sid": 300, "location": "US West (Los Angeles - HostUS)"},
+]
+RESP = {"status": 200, "rtts": [
+    {"sid": 9, "rttavg": 38.5, "success": 4, "failure": 0},
+    {"sid": 11, "rttavg": 31.0, "success": 4, "failure": 0},
+    {"sid": 46, "rttavg": 0.0, "success": 0, "failure": 4},
+    {"sid": 300, "rttavg": 5.0, "success": 4, "failure": 0},
+]}
+
+
+class NodesTest(unittest.TestCase):
+    def test_rtts_skip_failed(self):
+        self.assertEqual(rtts_from_response(RESP), {9: 38.5, 11: 31.0, 300: 5.0})
+
+    def test_rtts_empty_while_measuring(self):
+        self.assertEqual(rtts_from_response({"status": 300, "n_checked": 11}), {})
+
+    def test_japan_only_sorted_by_rtt_unmeasured_last(self):
+        nodes = japan_nodes(STATIC, rtts_from_response(RESP))
+        self.assertEqual([n.sid for n in nodes], [11, 9, 46])
+        self.assertEqual(nodes[0].label, "Osaka - SakuraNet 4")
+        self.assertIsNone(nodes[2].rtt)
+
+    def test_pick_auto_lowest(self):
+        self.assertEqual(pick_auto(japan_nodes(STATIC, rtts_from_response(RESP))).sid, 11)
+
+    def test_pick_auto_none_without_rtts(self):
+        self.assertIsNone(pick_auto(japan_nodes(STATIC, {})))
+
+
+if __name__ == "__main__":
+    unittest.main()

tests/test_routes.py

@@ -0,0 +1,52 @@
+import types
+import unittest
+
+from mudfish_decky.routes import delete_routes, host_routes, leftover_routes
+
+BEFORE = """default via 192.168.1.1 dev wlan0 proto dhcp src 192.168.1.50 metric 600
+192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.50 metric 600
+"""
+AFTER = BEFORE + """1.201.174.247 via 192.168.1.1 dev wlan0
+2.58.243.110 via 192.168.1.1 dev wlan0
+10.254.100.5 via 10.254.100.1 dev tap0
+"""
+
+
+class RoutesTest(unittest.TestCase):
+    def test_host_routes_excludes_default_prefix_and_proto(self):
+        self.assertEqual(host_routes(BEFORE), set())
+
+    def test_host_routes_normalizes_trailing_space(self):
+        self.assertEqual(host_routes("1.2.3.4 via 192.168.1.1 dev wlan0 \n"),
+                         {"1.2.3.4 via 192.168.1.1 dev wlan0"})
+
+    def test_leftover_routes_only_new_non_tap(self):
+        self.assertEqual(leftover_routes(host_routes(BEFORE), AFTER),
+                         ["1.201.174.247 via 192.168.1.1 dev wlan0", "2.58.243.110 via 192.168.1.1 dev wlan0"])
+
+    def test_leftover_routes_none_snapshot_deletes_nothing(self):
+        self.assertEqual(leftover_routes(None, AFTER), [])
+
+    def test_leftover_routes_keeps_preexisting_host_routes(self):
+        before = host_routes(AFTER.replace("2.58.243.110", "9.9.9.9"))
+        self.assertNotIn("1.201.174.247 via 192.168.1.1 dev wlan0", leftover_routes(before, AFTER))
+
+    def test_delete_routes_runs_ip_route_del(self):
+        calls = []
+
+        def run(cmd, **kw):
+            calls.append(cmd)
+            return types.SimpleNamespace(returncode=0)
+
+        self.assertEqual(delete_routes(["1.2.3.4 via 192.168.1.1 dev wlan0"], run=run), 1)
+        self.assertEqual(calls, [["ip", "route", "del", "1.2.3.4", "via", "192.168.1.1", "dev", "wlan0"]])
+
+    def test_delete_routes_counts_failures_as_not_deleted(self):
+        def run(cmd, **kw):
+            raise OSError("boom")
+
+        self.assertEqual(delete_routes(["1.2.3.4 via 192.168.1.1 dev wlan0"], run=run), 0)
+
+
+if __name__ == "__main__":
+    unittest.main()