caucase.test: CAUCASE_NETLOC should not contain literal IP addresses

caucase/test.py

@@ -388,6 +388,14 @@ class CaucaseTest(TestCase):
     )
     self._caucase_url = 'http://' + netloc
     parsed_url = urllib_parse.urlparse(self._caucase_url)
+
+    try:
+      ipaddress.ip_address(parsed_url.hostname)
+    except ValueError:
+      pass # parsed_url.hostname is a hostname as expected
+    else: # pragma: no cover
+      raise AssertionError('CAUCASE_NETLOC should not contains literal IP')
+
     self.assertFalse(
       canConnect((parsed_url.hostname, parsed_url.port)),
       'Something else is already listening on %r, define CAUCASE_NETLOC '
@@ -3795,10 +3803,21 @@ class CaucaseShellTest(TestCase):
     """
     Run caucase.sh's embedded testsuite.
     """
-    self._run('--test', os.getenv(
+    netloc = os.getenv(
       'CAUCASE_NETLOC',
       'localhost:8000',
-    ))
+    )
+    caucase_url = 'http://' + netloc
+    parsed_url = urllib_parse.urlparse(caucase_url)
+
+    try:
+      ipaddress.ip_address(parsed_url.hostname)
+    except ValueError:
+      pass # parsed_url.hostname is a hostname as expected
+    else: # pragma: no cover
+      raise AssertionError('CAUCASE_NETLOC should not contains literal IP')
+
+    self._run('--test',netloc)
 
 if __name__ == '__main__': # pragma: no cover
   unittest.main()