tests: use random port instead of 8080 for cli test to avoid conflicts with running services

pywb/framework/wsgi_wrappers.py

@@ -168,7 +168,7 @@ def start_wsgi_ref_server(the_app, name, port):  # pragma: no cover
     import wsgiref.handlers
     wsgiref.handlers.is_hop_by_hop = lambda x: False
 
-    if not port:
+    if port is None:
         port = DEFAULT_PORT
 
     logging.info('Starting %s on port %s', name, port)

tests/test_auto_colls.py

@@ -84,17 +84,18 @@ class TestManagedColls(object):
         test autoindex error before collections inited
         """
         from pywb.apps.cli import wayback
-        wayback([])
+
+        wayback(['-p', '0'])
 
         # Nothing to auto-index.. yet
         with raises(SystemExit):
-            wayback(['-a'])
+            wayback(['-a', '-p', '0'])
 
         colls = os.path.join(self.root_dir, 'collections')
         os.mkdir(colls)
 
         pywb.manager.autoindex.keep_running = False
-        wayback(['-a'])
+        wayback(['-a', '-p', '0'])
 
     def test_create_first_coll(self):
         """ Test first collection creation, with all required dirs