test(hypervisors): add unit tests for CloudHypervisor

[r0hansaxena]

Description

Adds unit tests for the CloudHypervisor VMM backend, covering BuildExecCmd and the simpler interface methods (UsesKVM, Ok, Path, PreExec, SupportsSharedfs). Tests are table-driven and cover all flag-generation branches including memory, networking, block devices, initrd, virtiofs and vsock.

Related issues

• Part of Add more unit tests #96

How was this tested?

Ran unit tests locally:

go test ./pkg/unikontainers/hypervisors/ -v -run "TestCloudHypervisor"

All 20 test cases passed. Full package tests also pass:

go test ./pkg/... ./internal/...

Linter passes locally (make lint, 0 issues).

LLM usage

Claude Sonnet 4.6 was used to assist with writing the tests. All code was reviewed and tested locally before submission.

Checklist

• I have read the contribution guide.
• The linter passes locally (make lint).
• The e2e tests of at least one tool pass locally (make test_ctr, make test_nerdctl, make test_docker, make test_crictl).
• If LLMs were used: I have read the llm policy.

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