Resolves #97: Include in tests into the context window when generating

[jiaminc-cmu]

close #97
Add --unit-test flag for pdd generate.
This PR introduces a --unit-test flag for the pdd generate command to allow including the corresponding test file in the generation context.

• Added --unit-test option to pdd generate

• Updated generation logic to load the associated test file into the context when the flag is set

• Appended a new test case to cover this behavior

[Copilot]

Pull request overview

This PR adds support for including unit test files in the generation context when using the pdd generate command. The --unit-test flag allows users to provide a test file path, which is then appended to the prompt content sent to the LLM to help generate code that passes the specified tests.

Key Changes:

• Added a --unit-test CLI option to the generate command
• Modified code_generator_main to read and append unit test content to the prompt when the flag is set
• Added test coverage for the new functionality

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
pdd/cli.py	Added --unit-test option and parameter to the generate command
pdd/code_generator_main.py	Implemented logic to read and append unit test content to the prompt with proper formatting
tests/test_code_generator_main.py	Added test case to verify unit test content is correctly included in the prompt

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[gltanaka]

Nice work! Although the issue initially made this optional, I think it is better to have this as the default with the option to exclude the tests.

Also, I think rather than have to find the unit test file, it would be better to automatically use the default naming conventions to find and include the unit tests esp. if the tests are split among multiple tests files.