diff --git a/tests/unit/service_test.py b/tests/unit/service_test.py
index 96b08107..ec17018e 100644
--- a/tests/unit/service_test.py
+++ b/tests/unit/service_test.py
@@ -42,6 +42,7 @@ class ServiceTest(unittest.TestCase):
         Service('foo', image='foo')
 
     def test_project_validation(self):
+        self.assertRaises(ConfigError, lambda: Service('bar'))
         self.assertRaises(ConfigError, lambda: Service(name='foo', project='_', image='foo'))
         Service(name='foo', project='bar', image='foo')