self.assertTrue(out_file.closed, "writer file not closed after context")
self.assertRaises(ValueError, out_file.write, 'extra text')
with self.mock_keep(data_loc, 200) as keep_mock:
self.assertTrue(out_file.closed, "writer file not closed after context")
self.assertRaises(ValueError, out_file.write, 'extra text')
with self.mock_keep(data_loc, 200) as keep_mock: