+ def test_cache_create_error(self):
+ _, filename = tempfile.mkstemp()
+ home_was = os.environ['HOME']
+ os.environ['HOME'] = filename
+ try:
+ c = arvados.http_cache('test')
+ self.assertEqual(None, c)
+ finally:
+ os.environ['HOME'] = home_was
+ os.unlink(filename)
+