test: add unit tests for nvinternal info, mig, and watch packages

[pmady]

Adds unit tests for three packages under pkg/device-plugin/nvidiadevice/nvinternal/ that had zero test coverage:

info/version_test.go (6 tests)

• GetVersion with custom and default values
• GetVersionParts with and without git commit
• GetVersionString basic and with extra args

mig/mig_test.go (1 test)

• GetMigCapabilityDevicePaths returns nil on non-MIG machines (covers the os.IsNotExist early-return path)

watch/watchers_test.go (4 tests)

• Files with valid path, nonexistent path, and empty input
• Signals channel creation

All tests pass locally. No production code changes.

Ref #569

[hami-robot]

Welcome @pmady! It looks like this is your first PR to Project-HAMi/HAMi 🎉

[gemini-code-assist]

Code Review

This pull request introduces unit tests for versioning, MIG capability detection, and file/signal watchers. The review feedback highlights that the MIG capability test is environment-dependent and suggests refactoring the underlying function to support filesystem mocking. Additionally, it is recommended to replace hardcoded temporary paths in the watcher tests with t.TempDir() to ensure better portability across different environments.

[pmady]

fixed all three — copyright year updated to 2026, switched to t.TempDir() for the nonexistent path, and added a t.Skip guard on the MIG test so it wont fail on machines with nvidia-caps present

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
unittests	58.15% <ø> (+0.28%)	⬆️

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see 14 files with indirect coverage changes

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[archlitchi]

/lgtm

[hami-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: archlitchi, pmady

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