CodeRabbit Generated Unit Tests: Add unit tests for PR changes

[coderabbitai]

Unit test generation was requested by @spoorcc.

• Fetch git submodule during update of git subproject #1017 (comment)

The following files were modified:

• tests/test_git_submodules.py
• tests/test_gitsubproject.py
• tests/test_metadata_nested.py
• tests/test_stdout_reporter_nested.py
• tests/test_subproject.py
• tests/test_util.py

[coderabbitai]

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