fix tests

[jeromehardaway]

This PR is to fix the tests by mocking the OPENAI_API_KEY environment variable in the VetsAI project.

[Sfayson1]

How do the mock objects (MagicMock) help us in this test?

[jonulak]

Where does the mock_file fixture come from?

[jeromehardaway]

How do the mock objects (MagicMock) help us in this test?

Mock objects, specifically MagicMock in Python's unittest.mock library, are crucial for unit testing. It helps isolate while preventing actual API calls.

[jeromehardaway]

Where does the mock_file fixture come from?

The mock_file is actually created by the @patch decorator, not a fixture. It patches Python's built-in open function so we can test file operations without touching the real file system. The mock gets injected automatically as a parameter to our test function - super useful for testing file handling without worrying about actual files! 👨‍💻