1 files changed, 24 insertions, 2 deletions

diff --git a/tests/integration/test_config.py b/tests/integration/test_config.py
index 1a84fa7..2f6bdc4 100644
--- a/tests/integration/test_config.py
+++ b/tests/integration/test_config.py
@@ -1,7 +1,9 @@
 """Settings the tracker has to accept, and still work with.
 
-An unrecognised key makes opentracker refuse to start, so a test that it
-comes up at all is a test that the key was understood.
+An unrecognised key only warns, so coming up proves nothing on its own and a
+test that cares has to look at what the tracker said. A key that is
+recognised but cannot be parsed is another matter, and for the listen
+statements it stops the tracker.
 """
 
 import unittest
@@ -14,6 +16,7 @@ class TcpWorkers(TrackerTestCase):
 
     def test_the_tracker_serves_with_tcp_workers_asked_for(self):
         self.assertEqual(self.tracker.announce(self.hash_for("tcpworkers"))[b"complete"], 1)
+        self.assertNotIn("Unhandled line", self.tracker.output())
 
 
 class WorkersOnAListenStatement(unittest.TestCase):
@@ -27,3 +30,22 @@ class WorkersOnAListenStatement(unittest.TestCase):
             self.assertEqual(complaints, [], "the tracker reported:\n" + "\n".join(complaints))
         finally:
             tracker._cleanup()
+
+
+class AListenLineThatDoesNotParse(unittest.TestCase):
+    """Warning and carrying on left a tracker that had been told where to
+    listen coming up on its default instead, which is every interface."""
+
+    def refuses(self, line):
+        with self.assertRaises(AssertionError) as caught:
+            Tracker(line)
+        return str(caught.exception)
+
+    def test_an_address_that_is_not_one_stops_the_tracker(self):
+        self.assertIn("want an address", self.refuses("listen.tcp 10.0.0.300:7999\n"))
+
+    def test_so_does_a_port_out_of_range(self):
+        self.assertIn("want an address", self.refuses("listen.udp 127.0.0.1:99999\n"))
+
+    def test_so_does_an_option_it_does_not_know(self):
+        self.assertIn("want an address", self.refuses("listen.tcp 127.0.0.1:7999 wokers=2\n"))