strengthen alluxio runtime helpers

[r0hansaxena]

Ⅰ. Describe what this PR does

test(api/v1alpha1) : harden AlluxioRuntime helper methods with nil-safe behavior and add unit tests for Replicas/GetStatus paths.

Ⅱ. Does this pull request fix one issue?

part of #5407

Ⅲ. List the added test cases (unit test/integration test) if any, please explain if no tests are needed.

• AlluxioRuntime.Replicas():
  • nil runtime returns 0
  • configured replicas returned correctly
  • zero-value runtime returns 0
• AlluxioRuntime.GetStatus():
  • nil runtime returns non-nil empty status
  • returns pointer to runtime status for non-nil runtime

Ⅳ. Describe how to verify it

go test ./api/v1alpha1 -v

Ⅴ. Special notes for reviews

[fluid-e2e-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[fluid-e2e-bot]

Hi @r0hansaxena. Thanks for your PR.

I'm waiting for a fluid-cloudnative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[gemini-code-assist]

Code Review

This pull request adds nil receiver checks to the Replicas and GetStatus methods of the AlluxioRuntime struct to improve robustness and prevent potential panics. It also introduces a new test file, alluxioruntime_types_test.go, which includes unit tests for these methods to ensure they handle nil pointers and valid instances correctly. I have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.47%. Comparing base (9fe6aad) to head (9eea5a7).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5777   +/-   ##
=======================================
  Coverage   60.47%   60.47%           
=======================================
  Files         465      465           
  Lines       31148    31148           
=======================================
  Hits        18837    18837           
  Misses      10764    10764           
  Partials     1547     1547           

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