[1.7.x] Fixed a few warnings in the testsuite.

Backport of 536ebaa0 from master.

tests/forms_tests/tests/test_forms.py

@@ -59,7 +59,7 @@ class FormsTestCase(TestCase):
         self.assertHTMLEqual(str(p['birthday']), '<input type="text" name="birthday" value="1940-10-9" id="id_birthday" />')
 
         nonexistenterror = "Key u?'nonexistentfield' not found in 'Person'"
-        with self.assertRaisesRegexp(KeyError, nonexistenterror):
+        with self.assertRaisesRegex(KeyError, nonexistenterror):
             p['nonexistentfield']
             self.fail('Attempts to access non-existent fields should fail.')
 

tests/view_tests/tests/test_static.py

@@ -36,6 +36,7 @@ class StaticTests(SimpleTestCase):
     def test_unknown_mime_type(self):
         response = self.client.get('/%s/file.unknown' % self.prefix)
         self.assertEqual('application/octet-stream', response['Content-Type'])
+        response.close()
 
     def test_copes_with_empty_path_component(self):
         file_name = 'file.txt'