You are working on the theskumar/python-dotenv repository. The source code is checked out at /testbed at…

You are working on the theskumar/python-dotenv repository. The source code is checked out at /testbed at…: a task in SWE-Lego-RL-2699 (Harbor dataset). But there is a feature missing, which is variables with no value like in this test…

The task

But there is a feature missing, which is variables with no value like in [this test](https://github.com/docker/compose/blob/master/tests/fixtures/env/resolve.env) where the variables `ENV_DEF` and `NO_DEF` should be fetched from the environment (if possible).

Part of Lego-X/Lego-RL-2699.