From 25273592b97edfdb6bafcb374f8db0fd520af732 Mon Sep 17 00:00:00 2001
From: Min RK <benjaminrk@gmail.com>
Date: Wed, 13 Jun 2018 16:28:49 +0200
Subject: [PATCH] don't cleanup services if they aren't available

---
 tests/conftest.py | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/tests/conftest.py b/tests/conftest.py
index 99aef951..5282ab53 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -3,6 +3,7 @@
 from unittest import mock
 
 from docker import from_env as docker_from_env
+from docker.errors import APIError
 import pytest
 
 from jupyterhub.tests.mocking import MockHub
@@ -40,7 +41,12 @@ def docker():
             if c.name.startswith("dockerspawner-test"):
                 c.stop()
                 c.remove()
-
-        for c in d.services.list():
-            if c.name.startswith("dockerspawner-test"):
-                c.remove()
+        try:
+            services = d.services.list()
+        except APIError:
+            # e.g. services not available
+            return
+        else:
+            for s in services:
+                if s.name.startswith("dockerspawner-test"):
+                    s.remove()