Moves test of config file creation to its own test.

tests/test_usecase.py

@@ -140,6 +140,10 @@ class TestInit(CommandTestCase):
         self.assertEqual(set(self.fs['os'].listdir(pubsdir)),
                          {'bib', 'doc', 'meta', 'notes'})
 
+    def test_init_config(self):
+        self.execute_cmds(['pubs init'])
+        self.assertTrue(self.fs['os'].path.isfile(self.default_conf_path))
+
 
 class TestAdd(DataCommandTestCase):
 
@@ -536,7 +540,6 @@ class TestUsecase(DataCommandTestCase):
                 'pubs doc add --move data/pagerank.pdf Page99'
                ]
         self.execute_cmds(cmds)
-        self.assertTrue(self.fs['os'].path.isfile(self.default_conf_path))
         self.assertFalse(self.fs['os'].path.exists('/data/pagerank.pdf'))
 
     def test_doc_remove(self):