test: cover juicefs engine with Ginkgo

[hxrshxz]

Ⅰ. Describe what this PR does

Add Ginkgo v2 + Gomega coverage for pkg/ddc/juicefs/engine.go and fix the package-local shutdown_test.go validation blocker by seeding the required fake JuiceFSRuntime objects.

Ⅱ. Does this pull request fix one issue?

#5676

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

• Added focused engine specs for Build and Precheck.
• Fixed package validation so TestDestroyWorker passes in package-wide runs without changing production code.

Ⅳ. Describe how to verify it

• make fmt
• go test ./pkg/ddc/juicefs/... -count=1
• go test -coverprofile=/tmp/fluid-requested-package.cover ./pkg/ddc/juicefs/... -count=1
• go tool cover -func=/tmp/fluid-requested-package.cover -> total 79.7%
• rg 'testify' pkg/ddc/juicefs/engine_test.go pkg/ddc/juicefs/shutdown_test.go

Ⅴ. Special notes for reviews

N/A

[fluid-e2e-bot]

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[fluid-e2e-bot]

Hi @hxrshxz. 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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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.8% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

This PR advances the repository-wide Ginkgo v2/Gomega migration by adding focused specs for the JuiceFS engine and stabilizing an existing shutdown unit test by seeding required fake runtime objects.

Changes:

• Migrated pkg/ddc/juicefs/engine_test.go from testing/testify-style checks to Ginkgo v2 + Gomega specs covering Build and Precheck.
• Fixed TestDestroyWorker validation/setup by adding fake JuiceFSRuntime objects to the fake client input set.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/ddc/juicefs/engine_test.go	Adds Ginkgo/Gomega coverage for Build and Precheck behaviors and error paths.
pkg/ddc/juicefs/shutdown_test.go	Seeds required JuiceFSRuntime objects so destroyWorkers() can load runtime metadata during tests.

---

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[gemini-code-assist]

Code Review

This pull request refactors the JuiceFS engine tests to use the Ginkgo and Gomega frameworks, adding comprehensive test cases for the Build and Precheck functions. It also updates the worker destruction tests to include JuiceFSRuntime objects in the fake client. A suggestion was made to simplify the initialization of these runtime objects in the test suite to enhance code readability.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.91%. Comparing base (5bc2c17) to head (0a1545e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5819      +/-   ##
==========================================
+ Coverage   58.89%   58.91%   +0.01%     
==========================================
  Files         479      479              
  Lines       32443    32443              
==========================================
+ Hits        19107    19113       +6     
+ Misses      11784    11779       -5     
+ Partials     1552     1551       -1     

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[cheyang]

感谢贡献！JuiceFS engine 测试迁移简洁。请确认：

1. 旧测试中 runtime2（name="test"）的 Build 场景在新测试中有覆盖。
2. 当前新增覆盖比旧测试少（+151 vs -108），是否有旧场景被遗漏？如果有遗漏请补充。

[cheyang]

感谢贡献！JuiceFS engine 测试迁移简洁。请确认：

1. 旧测试中 runtime2（name="test"）的 Build 场景在新测试中有覆盖。
2. 当前新增覆盖比旧测试少（+151 vs -108），是否有旧场景被遗漏？如果有遗漏请补充。

[cheyang]

感谢贡献！JuiceFS engine 测试迁移简洁。请确认：

1. 旧测试中 runtime2（name="test"）的 Build 场景在新测试中有覆盖。
2. 当前新增覆盖比旧测试少（+151 vs -108），是否有旧场景被遗漏？如果有遗漏请补充。