WIP: add close method for MagicFolderDB and make MagicFolderDbTests use it.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

src/allmydata/magicfolderdb.py

@@ -53,6 +53,9 @@ class MagicFolderDB(object):
         self.connection = connection
         self.cursor = connection.cursor()
 
+    def close(self):
+        self.connection.close()
+
     def get_db_entry(self, relpath_u):
         """
         Retrieve the entry in the database for a given path, or return None

src/allmydata/test/test_magic_folder.py

@@ -42,6 +42,8 @@ class MagicFolderDbTests(unittest.TestCase):
         self.failUnlessEqual(self.db.VERSION, 1)
 
     def tearDown(self):
+        if hasattr(self, 'db'):
+            self.db.close()
         shutil.rmtree(self.temp)
         return super(MagicFolderDbTests, self).tearDown()