Extract docker URL logic, use it in tests as well

tests/project_test.py

@@ -1,5 +1,4 @@
 from fig.project import Project
-from fig.service import Service
 from .testcases import DockerClientTestCase
 
 
@@ -57,7 +56,7 @@ class ProjectTest(DockerClientTestCase):
         self.assertEqual(len(unstarted), 2)
         self.assertEqual(unstarted[0][0], web)
         self.assertEqual(unstarted[1][0], db)
-        self.assertEqual(len(web.containers(stopped=True)), 2)
+        self.assertEqual(len(web.containers(stopped=True)), 1)
         self.assertEqual(len(db.containers(stopped=True)), 1)
 
     def test_up(self):

tests/testcases.py

@@ -1,16 +1,13 @@
 from docker import Client
 from fig.service import Service
-import os
+from fig.cli.utils import docker_url
 from unittest import TestCase
 
 
 class DockerClientTestCase(TestCase):
     @classmethod
     def setUpClass(cls):
-        if os.environ.get('DOCKER_URL'):
-            cls.client = Client(os.environ['DOCKER_URL'])
-        else:
-            cls.client = Client()
+        cls.client = Client(docker_url())
         cls.client.pull('ubuntu')
 
     def setUp(self):