def test_lease_file(self):
with TempDir() as cache_dir:
cache = Directory(path=cache_dir)
key = 'foo'
self.assertFalse(cache.exists(key))
with cache.lease_file(key, create=True) as path:
self.assertTrue(cache.exists(key))
self.assertTrue(os.path.exists(path))
with open(path, 'r') as f:
self.assertNotEqual(f.read(), key)
with open(path, 'w') as f:
f.write(key)
self.assertTrue(cache.exists(key))
with cache.lease_file(key) as path:
with open(path, 'r') as f:
self.assertEqual(f.read(), key)
