diff --git a/tooz/tests/test_coordination.py b/tooz/tests/test_coordination.py
index 411db950..cff8a610 100644
--- a/tooz/tests/test_coordination.py
+++ b/tooz/tests/test_coordination.py
@@ -29,12 +29,16 @@ class TestAPI(testscenarios.TestWithScenarios,
               tests.TestCaseSkipNotImplemented):
 
     scenarios = [
-        ('zookeeper', {'url': 'kazoo://127.0.0.1:2181?timeout=5'}),
+        ('zookeeper', {'url': 'kazoo://127.0.0.1:2181?timeout=5',
+                       'bad_url': 'kazoo://localhost:1'}),
         ('zake', {'url': 'zake://?timeout=5'}),
-        ('memcached', {'url': 'memcached://?timeout=5'}),
+        ('memcached', {'url': 'memcached://?timeout=5',
+                       'bad_url': 'memcached://localhost:1'}),
         ('ipc', {'url': 'ipc://'}),
-        ('redis', {'url': 'redis://localhost:6379?timeout=5'}),
-        ('postgresql', {'url': os.getenv("TOOZ_TEST_PGSQL_URL")}),
+        ('redis', {'url': 'redis://localhost:6379?timeout=5',
+                   'bad_url': 'redis://localhost:1'}),
+        ('postgresql', {'url': os.getenv("TOOZ_TEST_PGSQL_URL"),
+                        'bad_url': 'postgresql://localhost:1'}),
         ('mysql', {'url': os.getenv("TOOZ_TEST_MYSQL_URL"),
                    'bad_url': 'mysql://localhost:1'}),
     ]