Make temp dir handling in tests a bit more pythonic

(and let them work on Windows)

realms/lib/test.py

@@ -1,17 +1,20 @@
+import os
+import shutil
+import tempfile
 from flask.ext.testing import TestCase
 from realms.lib.util import random_string
 from realms import create_app
-from subprocess import call
 
 
 class BaseTest(TestCase):
 
     def create_app(self):
+        self.tempdir = tempfile.mkdtemp()
         app = create_app()
         app.config['TESTING'] = True
         app.config['PRESERVE_CONTEXT_ON_EXCEPTION'] = False
-        app.config['WIKI_PATH'] = '/tmp/%s' % random_string(12)
-        app.config['DB_URI'] = 'sqlite:////tmp/%s.db' % random_string(12)
+        app.config['WIKI_PATH'] = os.path.join(self.tempdir, random_string(12))
+        app.config['DB_URI'] = 'sqlite:///%s/%s.db' % (self.tempdir, random_string(12))
         app.config.update(self.configure())
         return app
 
@@ -19,5 +22,4 @@ class BaseTest(TestCase):
         return {}
 
     def tearDown(self):
-        call(['rm', '-rf', self.app.config['WIKI_PATH']])
-        call(['rm', '-f', self.app.config['DB_URI'][10:]])
+        shutil.rmtree(self.tempdir)